JP2009014710A - X-ray ct apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of three-dimensionally acquiring a position to be CT-imaged to obtain a tomographic image of an object's interest region. <P>SOLUTION: The X-ray CT apparatus 1 comprises an X-ray measuring optical system 13, a table 14, a table driving mechanism 16, an input device 22, a display device 23, a CT photographing execution part 34 executing CT photographing, and a recomposition computing part 35 recomposing the tomographic image of the object using the CT-photographed radioscopic image data. The apparatus further comprises a data storage control part 30 storing object imaging region data indicating an object imaging region 27 in a storage part 25 when a partial region of a test-photographed radioscopic image 24 which is a radioscopic image with at least two planes including a first radioscopic image 24a of the object and a second radioscopic image 24b in a direction different from the first radioscopic image 24a, is specified as an object imaging region 27 by the input device 22. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an X-ray inspection apparatus that captures a fluoroscopic X-ray image of a subject, and more particularly to an industrial X-ray CT apparatus that captures an enlarged tomographic image of a part of an article.

The X-ray inspection apparatus can observe internal defects and internal structures that cannot be determined from the appearance by the fluoroscopic X-ray image displayed on the display device. For example, the X-ray inspection apparatus can be used for internal inspection of electronic components and other industrial products. It's being used.
The X-ray measurement optical system of the X-ray inspection apparatus includes an X-ray source and an X-ray detector arranged so as to face the X-ray source.

Among X-ray inspection apparatuses, the X-ray CT apparatus can observe in more detail internal defects, internal structures, and the like that cannot be determined from the appearance by a tomographic image displayed on the display device by performing CT imaging. .
Such an X-ray CT apparatus further includes a rotation table for placing a subject and applying rotation between the X-ray source and the X-ray detector.

  When performing CT imaging with an X-ray CT apparatus, a fluoroscopic X-ray is emitted from an X-ray source so that a fluoroscopic X-ray image of the subject is picked up by an X-ray detector, and a rotary table on which the subject is placed is mounted. Whenever it is rotated by a minute angle, fluoroscopic X-ray image data is taken from the X-ray detector. Then, a tomographic image of the subject is reconstructed using the captured fluoroscopic X-ray image data (see, for example, Patent Document 1). Thus, the display device performs three-dimensional image display by volume rendering or arbitrary cross-sectional image display (hereinafter also referred to as MPR (Multi Planer Reconstruction) display) from three-dimensional data including a plurality of tomographic images.

  Incidentally, an X-ray CT apparatus is known that has an enlargement reconstruction function that can display a tomographic image obtained by enlarging a partial region of a subject. For example, the enlargement reconstruction function is to display the tomographic image by enlarging the region of interest by digital image processing by designating the region of interest on the tomographic image displaying the entire region of the subject. However, the tomographic image enlarged by the enlargement reconstruction function is a tomographic image enlarged by calculation, and the fluoroscopic X-ray image data contributing to the calculation is the same as that before enlargement. Therefore, the image quality of the tomographic image after the enlargement reconstruction is not as clear as before the enlargement.

In view of this, a rotary table that has been translated by a table drive mechanism has been developed. There is known an X-ray CT apparatus that newly captures appropriate fluoroscopic X-ray image data by translating a subject placed on a rotary table by such a table driving mechanism. In other words, CT images of a fluoroscopic X-ray image obtained by enlarging a part of the subject by translation of the rotary table are obtained, and an enlarged tomographic image is obtained by reconstructing the captured fluoroscopic X-ray image data. ing. At this time, the control of the table drive mechanism that performs translational movement of the rotary table is executed by receiving a drive signal from the manual input device.
JP 2004-1117024 A

  By the way, in the X-ray CT apparatus as described above, the position adjustment for photographing a fluoroscopic X-ray image obtained by enlarging a partial region of the subject is performed by fluoroscopy X of the current state of the subject displayed on the display device. Generally, it is performed while looking at numerical information (for example, the diameter and height of a cylindrical shape) of a line image and an imaging field of view FOV (Field of View) (a region of a rotating body centered on a rotation axis). Here, the adjustment of the imaging field of view will be described using a fluoroscopic X-ray image of the condenser as a specific example. FIG. 16 is a diagram showing an example of a fluoroscopic X-ray image showing the entire shape of the condenser (subject) displayed on the display device, and FIG. 17 is an enlarged perspective X of a partial area of the condenser (subject). It is a figure which shows an example of a line image. As shown in FIGS. 16 and 17, the fluoroscopic X-ray image of the condenser is created using the video signal when the fluoroscopic X-ray passes through the condenser as it is, so that the fluoroscopic X-ray is transmitted. The image is displayed by overlapping the internal structure of the capacitor in the area. Therefore, even if the position adjustment for photographing a fluoroscopic X-ray image obtained by enlarging a part of the condenser is performed while viewing the fluoroscopic X-ray image of the condenser as shown in FIG. 16 or FIG. In addition, it is difficult to intuitively grasp the region of the condenser to be enlarged CT imaging (that is, the imaging field of view FOV at the time of enlargement).

For this reason, the first CT scan position adjustment is performed so that a fluoroscopic X-ray image of a capacitor in a relatively large region (preferably the entire region) including the region of interest can be obtained, and a tomographic image taken with a large FOV. And confirm the trial tomographic image obtained there, and adjust the position while viewing the fluoroscopic X-ray image again. Then, until the (enlarged) tomographic image of the region of interest of the condenser was obtained, the position adjustment was repeated many times to narrow down the imaging field of view FOV.
Therefore, it takes time and labor for CT imaging at least twice including the first CT imaging until a desired tomographic image is obtained.

  Accordingly, an object of the present invention is to provide an X-ray CT apparatus that can three-dimensionally grasp a position where CT imaging is to be performed in order to obtain a tomographic image of a region of interest of a subject.

  An X-ray CT apparatus of the present invention made to solve the above-described problems includes an X-ray detector that captures a fluoroscopic X-ray image of a subject, and an X-ray source that irradiates fluoroscopic X-rays toward the X-ray detector. An X-ray measuring optical system, a table disposed between the X-ray source and the X-ray detector and capable of translational and rotational movement with the subject placed thereon, and a table based on the drive signal A table drive mechanism for rotating and translating, an input device that is input to create the drive signal and imaging signal, and that is input to specify a target imaging region including a region of interest of the subject; By capturing a fluoroscopic X-ray image of the subject and a display device that displays a fluoroscopic X-ray image of the subject, the current positional relationship among the X-ray source, the X-ray detector, and the table is displayed on the display device. Associated fluoroscopic X-ray image The X-ray image data indicating the fluoroscopic X-ray image in which the positional relationship of the X-ray source, the X-ray detector, and the table is associated with each other is displayed in the storage unit. The positional relationship among the X-ray source, the X-ray detector, and the table is associated with each other by taking a fluoroscopic X-ray image of the subject while rotating the table and rotating the table. A tomographic image of a subject is reconstructed using a CT imaging execution unit for performing CT imaging for storing a plurality of fluoroscopic X-ray image data in a storage unit and a plurality of fluoroscopic X-ray image data stored by the CT imaging. An X-ray CT apparatus comprising a reconstruction calculation unit, wherein the subject is captured using at least two fluoroscopic X-ray image data stored by the fluoroscopic X-ray image display storage control unit before the CT imaging. An image of a trial radiographic X-ray image that is a fluoroscopic X-ray image of at least two surfaces including a first fluoroscopic X-ray image of a body and a second fluoroscopic X-ray image in a direction different from the first fluoroscopic X-ray image When the display is performed and a partial region of the first fluoroscopic X-ray image is two-dimensionally designated as the first target imaging region by the input device, the tertiary corresponding to the first target imaging region A data storage control unit is provided that stores the target imaging region data representing the original region in the storage unit and associates it with the other fluoroscopic X-ray image of the trial radiographic X-ray image.

  Here, the “trial radiograph X-ray image” is displayed in advance in order to confirm the positional relationship between the subject and the X-ray measurement optical system before adjusting the position of the table for performing CT imaging. This is a fluoroscopic X-ray image of at least two surfaces, and is used so that a target imaging region can be specified so as to include a region of interest in a subject and an enlarged tomographic image of a desired region of interest can be acquired. Moreover, it is preferable that the fluoroscopic X-ray image displayed on the screen as the trial radiographic fluoroscopic X-ray image is two surfaces captured from directions orthogonal to each other.

According to the X-ray CT apparatus of the present invention, before the CT imaging, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the fluoroscopic X-ray image in the storage unit when an imaging signal is input. Let
Accordingly, the data storage control unit uses the at least two stored fluoroscopic X-ray image data stored before CT imaging, and includes a first fluoroscopic X-ray image and a second fluoroscopic X-ray image of the subject. A radiographic X-ray image is displayed.
Then, when a part of the first fluoroscopic X-ray image is designated by the input device as the first target imaging area, the target imaging area data indicating the first target imaging area is stored in the storage unit. Thus, the second fluoroscopic X-ray image is also associated.

The target imaging area data stored in this way is used for image display when the operator of the X-ray CT apparatus performs three-dimensional positioning, or the X-ray CT apparatus performs CT imaging of the target imaging area. It is used for calculating the amount of movement of the table at the time, and is effectively used when aligning the region of interest when performing CT imaging of the subject.
For example, as a fluoroscopic X-ray image different from the fluoroscopic X-ray image indicating the current positional relationship between the table and the X-ray measurement optical system, the first fluoroscopic image is displayed beside the fluoroscopic X-ray image indicating the current positional relationship. If the X-ray image and the second fluoroscopic X-ray image are displayed at the same time, the target imaging area corresponding to the target imaging area data can be displayed from various directions on these images (the implementation described later). Embodiment 1) The target imaging area corresponding to the target imaging area data can be used to calculate the amount of movement of the table when CT imaging is automatically performed (Embodiment 2 described later).
In addition, when a first target imaging region is designated in the fluoroscopic X-ray image indicating the current positional relationship, the fluoroscopic X-ray image indicating the current positional relationship is one of the trial X-ray fluoroscopic images. The first fluoroscopic X-ray image is stored in the storage unit, and the target imaging area data is also stored at that time. Thereafter, the table and the X-ray measurement optical system are moved, so that the fluoroscopic X-ray image indicating the current positional relationship is different from the stored first fluoroscopic X-ray image. May be a second fluoroscopic X-ray image that is one of the trial X-ray fluoroscopic images, and all operations may be performed (Embodiment 3, described later). Form 4). That is, in the third and fourth embodiments, unlike the first and second embodiments described above, a fluoroscopic X-ray image different from the fluoroscopic X-ray image indicating the current positional relationship between the table and the X-ray measurement optical system. In other words, only one side of the fluoroscopic X-ray image indicating the current positional relationship is always displayed.

  According to the X-ray CT apparatus of the present invention, before performing CT imaging, the position of the target imaging region that is slightly larger than the region of interest is three-dimensionally confirmed on at least two fluoroscopic X-ray images. Therefore, in order to obtain a tomographic image of the region of interest of the subject, the position where CT imaging should be performed can be intuitively grasped. Therefore, first, it is not necessary to perform CT imaging on a subject in a relatively large area including the region of interest, and an area slightly larger than the region of interest of the subject can be easily CT-imaged in the first CT imaging.

(Means and effects for solving other problems)
In the X-ray CT apparatus of the present invention, the data storage control unit includes at least two surfaces including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A trial X-ray fluoroscopic X-ray image display unit that simultaneously displays the X-ray X-ray image of the image, and a partial area of the first X-ray fluoroscopic image is designated by the input device as a first target imaging area, You may make it provide the target imaging area display part which superimposes a 1st target imaging area on other fluoroscopic X-ray images of a trial radiographic X-ray image, and displays an image.

According to the X-ray CT apparatus of the present invention, first, the table is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject (although not necessarily the entire area), the first time of the subject. The fluoroscopic X-ray image is captured, and the table is rotated (for example, rotated by 90 °) so as to be different from the imaging direction of the first fluoroscopic X-ray image. Perform image capture. Thereby, based on the obtained two fluoroscopic X-ray image data, the first X-ray fluoroscopic image captured on the display device is used as the first fluoroscopic X-ray image on the display device, and the fluoroscopic image captured the second time. The trial radiographic X-ray image is displayed with the X-ray image as the second fluoroscopic X-ray image.
Next, using the input device, a part of the first fluoroscopic X-ray image (a region slightly larger than the region of interest) is designated as the first target imaging region. At this time, the designation is performed in a predetermined shape (for example, a preset rectangular shape). As a result, using a positional relationship among the X-ray source, the X-ray detector, and the table, a fluoroscopic X-ray image detection region (for example, a quadrangular pyramid corresponding to a quadrangular shape) indicating a first target imaging region corresponding to a predetermined shape. Area) is superimposed on the second fluoroscopic X-ray image and displayed.
Therefore, according to the X-ray CT apparatus of the present invention, the first target imaging region designated by the first fluoroscopic X-ray image is superimposed on the second fluoroscopic X-ray image before performing CT imaging. As a result, an area that is slightly larger than the region of interest can be confirmed from two directions, and the position where CT imaging should be performed can be grasped three-dimensionally in order to obtain a tomographic image of the region of interest of the subject.
The “predetermined shape” may be, for example, a preset quadrangular shape or a circular shape, and the shape and size can be arbitrarily changed each time one operation is performed. May be.

  In the X-ray CT apparatus of the present invention, the data storage control unit includes at least two surfaces including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A trial X-ray X-ray image display unit for simultaneously displaying the X-ray X-ray image of the first X-ray image, a partial area of the first X-ray X-ray image is designated as a first target imaging area by the input device; Target imaging representing a three-dimensional area corresponding to the second target imaging area when a partial area of the second fluoroscopic X-ray image is two-dimensionally designated by the input device as the second target imaging area The X-ray source, the X-ray detector and / or the table are stored so that the area data is stored in the storage unit, and the common area of the first target imaging area and the second target imaging area is CT-scanned. Objective imaging that outputs drive signals for automatic translation It may be provided with a band moving portion.

According to the X-ray CT apparatus of the present invention, first, the table is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject (although not necessarily the entire area), the first time of the subject. The fluoroscopic X-ray image is captured, and the table is rotated (for example, rotated by 90 °) so as to be different from the imaging direction of the first fluoroscopic X-ray image. Perform image capture. Thereby, based on the obtained two fluoroscopic X-ray image data, the first X-ray fluoroscopic image captured on the display device is used as the first fluoroscopic X-ray image on the display device, and the fluoroscopic image captured the second time. The trial radiographic X-ray image is displayed with the X-ray image as the second fluoroscopic X-ray image.
Next, using the input device, a part of the first fluoroscopic X-ray image (a region slightly larger than the region of interest) is designated as the first target imaging region. Furthermore, using the input device, a part of the region in the second fluoroscopic X-ray image (region slightly larger than the region of interest) is designated as the second target imaging region. At this time, the designation is performed in a predetermined shape (for example, a preset rectangular shape). As a result, according to the X-ray CT apparatus of the present invention, a fluoroscopic X-ray image detection region (for example, each quadrangular pyramid corresponding to a quadrangular shape) that indicates a target imaging region that is designated as an area slightly larger than the region of interest from two directions and overlaps. The target imaging area moving unit appropriately and automatically moves the object and the X-ray measurement optical system by calculating the minimum cylindrical shape so that the area where the area overlaps) is obtained by CT imaging. A tomographic image can be easily obtained.

  And in the X-ray CT apparatus of this invention, the said data storage control part is a partial area | region of the fluoroscopic X-ray image with which the current positional relationship of the said X-ray source, an X-ray detector, and a table was matched. When the first target imaging region is designated by the input device, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit. A fluoroscopic X-ray in which a target imaging region data storage control unit that stores target imaging region data indicating one target imaging region in a storage unit and a current positional relationship among the X-ray source, the X-ray detector, and the table are associated with each other A first target imaging region in a fluoroscopic X-ray image that is superimposed on the image and displayed as an image, and is displayed in conjunction with the movement of the X-ray source, X-ray detector, or table. The target imaging area update display Preparative may be provided with.

According to the X-ray CT apparatus of the present invention, first, the table is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject, and a partial area (interest of interest) of the fluoroscopic X-ray image of the subject using the input device. A region slightly larger than the region) is designated as the first target imaging region. At this time, the designation is performed in a predetermined shape (for example, a preset rectangular shape).
Next, the table is rotationally moved (for example, rotated by 90 °) so as to be different from the direction of the first fluoroscopic X-ray image, but in conjunction with the movement of the table, the X-ray source, and the X-ray detector. The fluoroscopic X-ray image detection area indicating the first target imaging area corresponding to the predetermined shape is the fluoroscopic X-ray image indicating the current positional relationship (after storing the first fluoroscopic X-ray image, The image is displayed while being superimposed and updated on a radiographic X-ray image.
Therefore, according to the X-ray CT apparatus of the present invention, the first fluoroscopic X-ray image is designated on the second fluoroscopic X-ray image (the fluoroscopic X-ray image in the current state) before performing CT imaging. By superimposing the first target imaging region, the region slightly larger than the region of interest can be confirmed from two directions, so that the position where the CT imaging should be performed is three-dimensionally to obtain a tomographic image of the region of interest of the subject. Can grasp.

  Furthermore, in the X-ray CT apparatus of the present invention, the data storage control unit includes a partial region of the fluoroscopic X-ray image in which the current positional relationship of the X-ray source, the X-ray detector, and the table is associated. When the first target imaging region is designated by the input device, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit. A first target imaging region data storage control unit for storing target imaging region data indicating one target imaging region in the storage unit, the X-ray source, the X-ray imaged from a different direction from the first fluoroscopic image When a partial area of the fluoroscopic X-ray image associated with the current positional relationship between the detector and the table is two-dimensionally designated by the input device as the second target imaging area, the fluoroscopic X-ray image is displayed. The storage control unit is the second fluoroscopic X-ray image A second target imaging region data storage control unit that stores the target imaging region data representing a three-dimensional region corresponding to the second target imaging region at the same time as storing the fluoroscopic X-ray image data shown in the storage unit. At least, and based on at least two fluoroscopic X-ray image data and at least two target imaging area data stored in the storage unit, common to the first target imaging area and the second target imaging area A target imaging region moving unit that outputs a drive signal that automatically translates the X-ray source, the X-ray detector, and / or the table may be provided so that the region is subjected to CT imaging.

According to the X-ray CT apparatus of the present invention, first, the table is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject, and a partial area (interest of interest) of the fluoroscopic X-ray image of the subject using the input device. A region slightly larger than the region) is designated as the first target imaging region. At this time, the designation is performed in a predetermined shape (for example, a preset rectangular shape).
Next, the table is rotationally moved (for example, rotated by 90 °) so as to be different from the imaging direction of the first fluoroscopic X-ray image, and further, the fluoroscopic X indicating the current positional relationship is used by using the input device. A part of a region (a region slightly larger than the region of interest) in the line image (which is also referred to as a second fluoroscopic X-ray image after storing the first fluoroscopic X-ray image) Specify as. At this time, the designation is performed in a predetermined shape (for example, a preset rectangular shape). As a result, according to the X-ray CT apparatus of the present invention, a fluoroscopic X-ray image detection region (for example, each quadrangular pyramid corresponding to a quadrangular shape) that indicates a target imaging region that is designated as a region slightly larger than the region of interest from two directions and overlapped The target imaging area moving unit appropriately and automatically moves the object and the X-ray measurement optical system by calculating the minimum cylindrical shape so that the area where the area overlaps) is obtained by CT imaging. A tomographic image can be easily obtained.

  An X-ray CT apparatus according to the present invention, which has been made to solve the above-mentioned problems, irradiates fluoroscopic X-rays toward the center of the detection surface of an X-ray detector that captures a fluoroscopic X-ray image of a subject and the X-ray detector. As described above, the X-ray source and the X-ray source are integrally provided, and the X-ray source and the X-ray detection can be rotated by a rotation axis perpendicular to the line connecting the X-ray detector and the X-ray source. The X-ray measurement optical system that can change the distance between the detector and the X-ray measurement optical system is rotated based on the drive signal, and the distance between the X-ray source and the X-ray detector is changed. An X-ray measuring optical system driving mechanism to be changed, a table disposed between the X-ray source and the X-ray detector and capable of translational and rotational movement with the subject placed thereon, and a table based on the driving signal A table drive mechanism for rotating and translating the drive signal, and the drive signal and imaging signal An input device that is input to be operated and configured to specify a target imaging region including a region of interest of the subject, a display device that displays an image of a fluoroscopic X-ray image of the subject, and By capturing a fluoroscopic X-ray image of the subject, the X-ray source, the X-ray detector, and the table are associated with the current positional relationship of the table with the display device, and the imaging signal is displayed. , X-ray source, X-ray detector, and fluoroscopic X-ray image data indicating a fluoroscopic X-ray image associated with the positional relationship of the table are stored in the storage unit. A plurality of fluoroscopic X-ray image data in which positional relationships among the X-ray source, the X-ray detector, and the table are associated with each other by taking a fluoroscopic X-ray image of the subject while rotating the table. In An X-ray CT apparatus comprising: a CT imaging execution unit that executes CT imaging to be memorized; and a reconstruction calculation unit that reconstructs a tomographic image of a subject using a plurality of fluoroscopic X-ray image data stored by the CT imaging And before the CT imaging, the first fluoroscopic X-ray image of the subject and the first fluoroscopic X-ray image data stored by the fluoroscopic X-ray image display storage control unit are used. An image display of a trial radiographic X-ray image which is a fluoroscopic X-ray image of at least two surfaces including a fluoroscopic X-ray image and a second fluoroscopic X-ray image in a different direction is performed, and the first fluoroscopic X-ray image is displayed. When a part of the area is designated as the first target imaging area two-dimensionally by the input device, the storage unit stores target imaging area data representing a three-dimensional area corresponding to the first target imaging area. The trial X-ray fluoroscopic image A data storage control unit for associating with other fluoroscopic X-ray images is provided.

According to the X-ray CT apparatus of the present invention, the first fluoroscopic X of the subject is moved by moving the table so that a fluoroscopic X-ray image of the entire region of the subject is obtained (but not necessarily the entire region). A line image is taken, and the second perspective of the subject is rotated by rotating the table or rotating the X-ray measurement optical system so that it is different from the direction of the first fluoroscopic X-ray image. X-ray imaging can be performed.
For example, first, the table is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject (although not necessarily the entire area), and the first fluoroscopic X-ray image of the subject is captured. Next, the table is rotated and moved (for example, rotated by 90 °) so that it is different from the first fluoroscopic X-ray image capturing direction, and the second fluoroscopic X-ray image capturing of the subject is executed, Unlike the table, the X-ray measurement optical system is rotated (for example, rotated by 90 °), and the second fluoroscopic X-ray image of the subject is taken, or the table is rotated (for example, rotated by 90 °). The X-ray measurement optical system can be rotated and moved (for example, rotated by 60 °), and a second fluoroscopic X-ray image of the subject can be captured.

  In the X-ray CT apparatus of the present invention, the data storage control unit includes at least two surfaces including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A trial X-ray fluoroscopic X-ray image display unit that simultaneously displays the X-ray X-ray image of the image, and a partial area of the first X-ray fluoroscopic image is designated by the input device as a first target imaging area, You may make it provide the target imaging area display part which superimposes a 1st target imaging area on other fluoroscopic X-ray images of a trial radiographic X-ray image, and displays an image.

  In the X-ray CT apparatus of the present invention, the data storage control unit includes at least two surfaces including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A trial X-ray X-ray image display unit for simultaneously displaying the X-ray X-ray image of the first X-ray image, a partial area of the first X-ray X-ray image is designated as a first target imaging area by the input device; Target imaging representing a three-dimensional area corresponding to the second target imaging area when a partial area of the second fluoroscopic X-ray image is two-dimensionally designated by the input device as the second target imaging area The area data is stored in the storage unit, and the X-ray measurement optical system is automatically rotated and moved so that a common area between the first target imaging area and the second target imaging area is captured by CT. The X-ray source, X-ray detector and / or table It may be provided with a purpose imaging region movement section that outputs a driving signal or to translation by.

  In the X-ray CT apparatus of the present invention, the data storage control unit may include a partial region of the fluoroscopic X-ray image in which the current positional relationship of the X-ray source, the X-ray detector, and the table is associated. When the first target imaging region is designated by the input device, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit. A fluoroscopic X-ray in which a target imaging region data storage control unit that stores target imaging region data indicating one target imaging region in a storage unit and a current positional relationship among the X-ray source, the X-ray detector, and the table are associated with each other A first target imaging region in a fluoroscopic X-ray image that is superimposed on the image and displayed as an image, and is displayed in conjunction with the movement of the X-ray source, X-ray detector, or table. The target imaging area update display section It may be provided with.

  In the X-ray CT apparatus of the present invention, the data storage control unit may include a partial region of the fluoroscopic X-ray image in which the current positional relationship of the X-ray source, the X-ray detector, and the table is associated. When the first target imaging region is designated by the input device, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit. A first target imaging region data storage control unit for storing target imaging region data indicating one target imaging region in the storage unit, the X-ray source, the X-ray imaged from a different direction from the first fluoroscopic image When a partial area of the fluoroscopic X-ray image associated with the current positional relationship between the detector and the table is two-dimensionally designated by the input device as the second target imaging area, the fluoroscopic X-ray image is displayed. The storage controller sends the second fluoroscopic image Storing the fluoroscopic X-ray image data in the storage unit, and simultaneously storing the target imaging area data representing the three-dimensional area corresponding to the second target imaging area in the storage unit; And a common area of the first target imaging area and the second target imaging area based on at least two fluoroscopic X-ray image data and at least two target imaging area data stored in the storage unit. Target imaging area for outputting a drive signal for automatically rotating and moving the X-ray measurement optical system and automatically translating the X-ray source, X-ray detector and / or table so that CT imaging is performed You may make it provide a moving part.

  In the X-ray CT apparatus of the present invention, the target imaging region moving unit may be configured so that a direction in which the X-ray source emits fluoroscopic X-rays is perpendicular to a rotation axis around which the table rotates. The X-ray source and the X-ray detection are performed so that a common area between the first target imaging area and the second target imaging area is CT-photographed after the X-ray measurement optical system is automatically rotated and moved. The instrument and / or the table may be automatically translated.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment, It cannot be overemphasized that various aspects are included in the range which does not deviate from the meaning of this invention.

(Embodiment 1)
FIG. 1a is a block diagram showing a configuration of an X-ray CT apparatus according to an embodiment of the present invention, and FIG. 1b is a detailed view of a range A shown in FIG. 1a. The X-ray CT apparatus 1 includes an X-ray measurement optical system 13 having an X-ray source 11 and an X-ray detector 12, a table 14 on which a subject is placed, a table drive mechanism 16, and an X-ray measurement optical system drive mechanism. 15 and a control system (computer) 20 that controls the entire X-ray CT apparatus 1.

  In the X-ray CT apparatus 1, the table 14 and the X-ray measurement optical system 13 can be moved from the origin position by the table drive mechanism 16 and the X-ray measurement optical system drive mechanism 15. In order to set or calculate, three orthogonal directions (x direction, y direction, z direction) are defined as shown in FIG. 1a. That is, the direction perpendicular to the surface of the table 14 on which the subject is placed (upper plate member 14a described later) is defined as the z direction, and the surface (horizontal plane) on which the subject is placed is defined as the xy plane. Further, when adjusting the magnification of the subject, the distance SOD (Source to Object Distance) between the X-ray source 11 and the subject is adjusted, or the distance SID (Source to Object) between the X-ray source 11 and the X-ray detector 12 is adjusted. Adjust Image Distance.

The X-ray source 11 has an X-ray tube that irradiates fluoroscopic X-rays conically toward the X-ray detector 12. When the X-ray source 11 and the X-ray detector 12 are at the origin position, the X-ray optical axis connecting the X-ray source 11 and the center of the detection surface of the X-ray detector 12 is the above-described x direction. As described above, the X-ray source 11 and the X-ray detector 12 are arranged. In the X-ray CT apparatus 1, the X-ray source 11 is fixed.
As the X-ray detector 12, a combination of an image intensifier (hereinafter abbreviated as II) and a CCD camera is used. II detects a fluoroscopic X-ray to form a rectangular fluoroscopic image. That is, the X-ray detector 12 has a rectangular detection surface, and detects an X-ray transmission image of a quadrangular pyramid area having the X-ray tube as a vertex (see FIG. 2). Then, a video signal of this perspective image is output to the computer 20.

  The X-ray detector 12 is formed so as to be able to translate in the direction of the X-ray source 11. The distance SID between the X-ray source 11 and the X-ray detector 12 can be adjusted by moving the X-ray detector 12 toward the X-ray source 11 (referred to as SID axis adjustment). When the SID is reduced by adjusting the SID axis, the enlargement ratio is lowered, and the detection sensitivity with which II detects fluoroscopic X-rays is improved. On the other hand, when the SID is increased, the enlargement ratio is increased and the detection sensitivity with which II detects fluoroscopic X-rays is reduced.

The table 14 is composed of three moving bodies including a lower member 14b, a middle plate-like body 14c, and an upper plate-like body 14a. The subject is placed on the upper plate-like body 14a having a horizontal surface.
The lower member 14b is capable of translational movement in the z direction as well as translational movement in the x direction.
By moving the lower member 14b of the table 14 in the x direction, the distance SOD between the X-ray source 11 and the subject can be adjusted (referred to as SOD axis adjustment). When the SOD is reduced by adjusting the SOD axis, the enlargement ratio increases. On the other hand, when the SOD is increased, the enlargement ratio decreases.
Further, the height of the imaging portion can be adjusted by moving the lower member 14b in the z direction (referred to as z-axis adjustment).

The middle plate-like body 14c of the table 14 is configured to be rotatable with respect to the lower member 14b with a rotation axis (θ-axis) in the z direction, and a subject placed on the upper plate-like body 14a is It can be rotated around an axis. At the time of CT imaging, fluoroscopic X-ray image data from various directions is acquired by imaging while rotating around the θ axis.
The upper plate 14a of the table 14 can be translated in the x direction and the y direction on the middle plate 14c. By moving the upper plate 14a in the x and y directions with respect to the rotation center (θ axis), the portion of the subject placed on the upper plate 14a to be imaged can be aligned with the rotation center. (Referred to as θx axis / θy axis adjustment).

The table drive mechanism 16 includes independent drive motors for the upper plate member 14a, the lower member 14b, and the middle plate member 14c. Note that the control of the table driving mechanism 16 is executed by receiving a driving signal output from a driving signal generator 36 (described later) of the computer 20.
The X-ray measurement optical system drive mechanism 15 includes a drive motor for moving the X-ray detector 12. Note that the control of the X-ray measurement optical system drive mechanism 15 is also executed when a drive signal output from a drive signal generator 36 (described later) of the computer 20 is given.

The computer 20 includes a CPU 21, a memory (storage unit) 25, a display device 23 having a monitor screen 23a, and a keyboard 22a and a mouse 22b as input devices as hardware.
Further, the function processed by the CPU 21 will be described as a block. The data storage control unit 30, the fluoroscopic X-ray image display storage control unit 31, the CT imaging execution unit 34, the reconstruction calculation unit 35, and the drive signal generation unit 36. In addition, the data storage control unit 30 includes a trial radiographic X-ray image display unit 37 that simultaneously displays at least two fluoroscopic X-ray images, and a keyboard 22a or a partial area of the fluoroscopic X-ray image as a target imaging area. By specifying with the mouse 22b, a target imaging area display unit 38 that displays an image by superimposing the target imaging area on another fluoroscopic X-ray image of the trial radiographic X-ray image is provided. Further, the memory 25 includes a fluoroscopic X-ray image data storage area 41 for storing fluoroscopic X-ray image data, a target imaging area data storage area 44 for storing target imaging area data, and a position data storage area 42.

  The position data storage area 42 stores reference coordinates (xyz coordinates), which is a three-dimensional coordinate system set in the X-ray CT apparatus 1, and uses a drive signal output from the drive signal generator 36 to obtain a central plate shape. Current position (xt, zt) and rotation angle (θt) of the body 14c on the xyz coordinates, position (θx, θy) of the upper plate 14a on the middle plate 14c, and X-ray detector The position data of the current position (xi, yi) on 12 xyz coordinates is stored. Further, the fixed position of the X-ray source 11 is also stored.

  The drive signal generator 36 outputs a drive signal for moving the table 14 to the table drive mechanism 16, and outputs a drive signal for moving the X-ray detector 12 to the X-ray measurement optical system drive mechanism 15. Control is performed to store the positions of the plate-like body 14c, the upper plate-like body 14a, and the X-ray detector 12 in the position data storage area 42. That is, the drive signal generator 36 moves the table 14 and the X-ray detector 12 by receiving an input operation using the keyboard 22a and the mouse 22b and a CT imaging signal described later.

Based on the video signal output from the X-ray detector 12, the fluoroscopic X-ray image display storage control unit 31 associates the current positional relationship between the table 14 and the X-ray measurement optical system 13 with the monitor screen 23a. In addition, the fluoroscopic X-ray image is displayed, and the radiographic X-ray image data is stored in the fluoroscopic X-ray image data storage area 41 by receiving imaging signals from the keyboard 22a and the mouse 22b. At this time, the fluoroscopic X-ray image data includes the position (xt, zt) and rotation angle (θt) of the middle plate-like body 14c, the position (θx, θy) of the upper plate-like body 14a on the middle plate-like body 14c, Further, it is stored in the fluoroscopic X-ray image data storage area 41 in correspondence with the position data of the position (xi, yi) of the X-ray detector 12.
For example, as shown in FIG. 2, first, the lower member 14b is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject M, and the first fluoroscopic X-ray image of the subject M is executed. Further, the second plate X-ray image of the subject M is captured by rotating the middle plate-like body 14c by 120 °. In addition, although it is preferable to acquire the fluoroscopic X-ray image image | photographed from the mutually orthogonal direction, two fluoroscopic X-ray images which do not have an orthogonal relationship in this way may be sufficient. Also, three or more fluoroscopic X-ray images may be acquired instead of two fluoroscopic X-ray images. 2 illustrates the positional relationship between the subject M and the X-ray measurement optical system 13 in an easy-to-understand manner. The X-ray source 11 and the X-ray detector are fixed by fixing the subject M instead of the X-ray source 11. It is described as if 12 rotates around the subject M so as to become an X-ray source 11 ′ and an X-ray detector 12 ′.

Next, the data storage control unit 30 will be described.
The trial radiographic X-ray image display unit 37 uses the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41 by the fluoroscopic X-ray image display storage control unit 31 as the trial radiograph X-ray image 24. Then, control is performed to display the first fluoroscopic X-ray image 24a and the second fluoroscopic X-ray image 24b of the subject M on the monitor screen 23a.
For example, as shown in FIG. 3, a first fluoroscopic X-ray image 24a of the subject M and a second fluoroscopic X-ray image 24b of the subject M taken from a different direction from the first fluoroscopic X-ray image 24a. Display an image. If there are a large number of fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41, three or more fluoroscopic X-ray images, not two fluoroscopic X-ray images, can be taken by trial. 24 may be displayed as an image.

The target imaging area display unit 38 indicates the target imaging area 27 by designating a partial area in one surface of the trial radiograph X-ray image 24 as the target imaging area 27 by an input operation using the keyboard 22a or the mouse 22b. The target imaging area data is stored in the target imaging area data storage area 44, and the target imaging area 27 is sampled based on the fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41 and the position data in the position data storage area 42. Control for displaying an image by superimposing it on another fluoroscopic X-ray image 24 of the fluoroscopic X-ray image is performed.
For example, as shown in FIG. 3, the first target imaging region 27a has a quadrangle (shown by a broken line) so that the region of interest O is included in the first fluoroscopic X-ray image 24a by an input operation using the keyboard 22a or the mouse 22b. ) Is displayed. Thus, when the X-ray measurement optical system 13 that has captured the first fluoroscopic X-ray image 24a and the subject M are in a positional relationship, the fluoroscopic X-ray quadrangular pyramid region (passing through the first target imaging region 27a) ( (Shown by a broken line) is calculated (refer to a quadrangular pyramid region indicated by a dotted line in FIG. 4). Then, the second fluoroscopic X-ray image 24b is superimposed and displayed with a trapezoid (indicated by a broken line) indicating the first target imaging area 27a that is an area including the fluoroscopic X-ray that has passed through the region of interest O. . In addition, by an input operation using the keyboard 22a or the mouse 22b, a quadrangle (shown by a solid line) is displayed as the second target imaging region 27b so that the region of interest O is included in the second fluoroscopic X-ray image 24b. Thus, when the X-ray measurement optical system 13 that has captured the second fluoroscopic X-ray image 24b and the subject M are in a positional relationship, the fluoroscopic X-ray quadrangular pyramid region (passed through the second target imaging region 27b) ( (Shown by a solid line) is calculated (refer to a quadrangular pyramid region indicated by a two-dot chain line in FIG. 4). Then, a trapezoid (indicated by a solid line) indicating a target imaging region 27b that is a region including the fluoroscopic X-ray that has passed through the region of interest O is superimposed on the first fluoroscopic X-ray image 24a and displayed as an image.
In this way, the operator can check the first fluoroscopic X-ray image 24a and the second fluoroscopic X-ray image 24b on which the target imaging region 27 is superimposed while checking the keyboard 22a and the mouse 22b in three dimensions. By performing the input operation according to, the table 14 and the X-ray detector 12 can be appropriately moved, and a tomographic image of the region of interest O of the subject M can be easily obtained.

The CT imaging execution unit 34 outputs a CT imaging signal to the drive signal generation unit 36, and performs control to rotate and move the middle plate-like body 14c around the rotation axis. Further, the CT imaging execution unit 34 sequentially captures a fluoroscopic X-ray image of the subject M at every preset minute rotation angle (Δθ), and stores the fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41. Control is performed.
The reconstruction calculation unit 35 performs control for reconstructing a tomographic image of the subject M using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.

Next, a procedure for displaying an enlarged tomographic image of the region of interest O of the subject M by the X-ray CT apparatus 1 will be described. 5 and 6 are flowcharts for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus 1.
First, the subject M is placed on the table 14 in the process of step S101.
Next, in the process of step S102, the fluoroscopic X-ray image display storage control unit 31 displays an image of the fluoroscopic X-ray image on the monitor screen 23a based on the video signal output from the X-ray detector 12 (FIG. 16 and FIG. 17). That is, a fluoroscopic X-ray image showing the current positional relationship between the subject M and the X-ray measurement optical system 13 is displayed as an image.

Next, in the process of step S103, a numerical parameter t representing the number of fluoroscopic X-ray images to be stored is stored as 0.
Next, in the process of step S104, the table 14 and the X-ray detector 12 are moved by the input operation with the keyboard 22a and the mouse 22b so as to obtain a fluoroscopic X-ray image of the entire area of the subject M, and xt, zt , Θx, θy, xi, yi (that is, adjustment of the SOD axis, z axis, θx axis / θy axis, SID axis, etc.) is performed. For example, the operator moves the table 14 and the X-ray detector 12 so as to obtain a fluoroscopic X-ray image in which the entire image of the subject M is shown as shown in FIGS. At this time, only the fluoroscopic X-ray image indicating the current positional relationship between the table 14 and the X-ray measurement optical system 13 is displayed on the monitor screen 23a.
Next, after positioning so that it becomes a fluoroscopic X-ray image of the whole area | region of the to-be-photographed object M, in a process of step S105, a radiographic X-ray image display is performed by inputting a radiography signal with the keyboard 22a or the mouse | mouth 22b. The storage control unit 31 captures the t th fluoroscopic X-ray image.
Next, in the process of step S <b> 106, the fluoroscopic X-ray image display storage control unit 31 stores the t-th fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41.

Next, in the process of step S107, it is determined whether or not the fluoroscopic X-ray image data is still stored by an input operation using the keyboard 22a or the mouse 22b. If it is determined that the fluoroscopic X-ray image data is to be stored, t = t + 1 is stored by proceeding to step S108, and the process returns to step S104. That is, the processes in steps S104 to S107 are repeatedly executed until it is determined that the fluoroscopic X-ray image data is not stored. In the present invention, in order to proceed to the process of step S109, it is essential that t ≧ 1 because at least two fluoroscopic images are required.
On the other hand, when it is determined that the fluoroscopic X-ray image data is not stored, the trial X-ray fluoroscopic image display unit 37 stores the fluoroscopic X-ray image stored in the fluoroscopic X-ray image data storage area 41 in the process of step S109. Using the data, an image of the trial radiograph X-ray image 24 is displayed on the monitor screen 23a. For example, as shown in FIG. 3, an image display of a first fluoroscopic X-ray image 24a and a second fluoroscopic X-ray image 24b is performed.

Next, in the process of step S110, the designated parameter s representing the number of target imaging areas to be designated is stored as 0.
Next, in the processing of step S111, a part of the area in one surface of the trial radiograph X-ray image 24 (the first fluoroscopic X-ray image 24a or the second fluoroscopic X-ray image 24b) is a keyboard 22a or a mouse 22b. Is designated as the target imaging region 27 by the input operation. For example, as shown in FIG. 3, the operator causes the first fluoroscopic X-ray image 24a to display an image of a quadrangle (indicated by a broken line) that indicates the first target imaging region 27a.

  Next, in the process of step S <b> 112, the target imaging region display unit 38 stores the fluoroscopic X-ray image data by designating a partial region in one side of the trial radiographic X-ray image 24 as the target imaging region 27. Based on the fluoroscopic X-ray image data of the area 41 and the position data of the position data storage area 42, the designated target imaging area 27 is superimposed on another fluoroscopic X-ray image of the trial radiographic X-ray image 24 to display an image. . For example, if the first target imaging region 27a is designated and displayed on the first fluoroscopic X-ray image 24a, the first target imaging region is displayed on the second fluoroscopic X-ray image 24b as shown in FIG. A trapezoid (shown by a broken line) showing 27a (a quadrangular pyramid region for detecting fluoroscopic X-rays) is displayed as an image.

  Next, in the processing of step S113, a part of the region in the other fluoroscopic X-ray image 24 of the trial radiograph X-ray image 24 is still designated as the target imaging region 27 by an input operation using the keyboard 22a or the mouse 22b. It is determined whether or not. If it is determined that the target imaging area 27 is designated, the process proceeds to step S114, s = s + 1 is stored, and the process returns to step S111. That is, the processes in steps S111 to S113 are repeatedly executed until it is determined that the target imaging area 27 is not designated. It should be noted that when s ≧ 1 is specified, the position where CT imaging should be performed in the target imaging region 27 displayed on the other fluoroscopic X-ray image is displayed intuitively only when s = 0 is specified. In some cases, the process of step S112 may be omitted.

On the other hand, if it is determined that the target imaging area 27 is no longer designated, an input for moving the table 14 or the X-ray detector 12 so that a tomographic image of the target area O of the subject M is obtained in the process of step S115. An operation is performed to adjust xt, zt, θx, θy, xi, yi (adjustment of SOD axis, z axis, θx axis / θy axis, SID axis, etc.).
At this time, since the target imageable region 27 including the target region O is superimposed on the first fluoroscopic X-ray image 24a and the second fluoroscopic X-ray image 24b, the image is displayed. The area to be photographed can be grasped three-dimensionally.

  Next, in the processing of step S116, after the alignment is performed, the CT imaging execution unit 34 moves the middle plate-like body 14c around the rotation axis at every minute rotation angle (Δθ) by an input operation for performing CT imaging. The CT imaging signal is output to the drive signal generator 36 so that the fluoroscopic X-ray images of the subject M are sequentially photographed. The drive signal generator 36 that has received the CT imaging signal outputs a drive signal for rotating the middle plate-like body 14 c to the table drive mechanism 16. At this time, fluoroscopic X-ray images are taken and the respective fluoroscopic X-ray image data are stored in the fluoroscopic X-ray image data storage area 41.

Next, in the process of step S117, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject M using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.
Finally, when the process of step S117 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus 1, the target imaging region that includes the region of interest O indicates the range of the tomographic image obtained when performing CT imaging before performing CT imaging. 27 can be confirmed in a three-dimensional manner on two or several fluoroscopic X-ray images 24 superimposed, so that the position setting operation can be performed by intuitively grasping the position of the subject M to be CT-photographed. .
Therefore, first, it is not necessary to perform CT imaging on a subject M in a relatively large area including the region of interest O, and CT imaging can be performed on a region slightly larger than the region of interest O of the subject M in the first CT imaging.

(Embodiment 2)
FIG. 7a is a block diagram showing a configuration of an X-ray CT apparatus according to another embodiment of the present invention, and FIG. 7b is a detailed view of a range B shown in FIG. 7a. The X-ray CT apparatus 2 includes an X-ray measurement optical system 73 having an X-ray source 71 and an X-ray detector 72, a table 74 on which a subject is placed, a table drive mechanism 76, and an X-ray measurement optical system drive mechanism. 75 and a control system (computer) 80 for controlling the entire X-ray CT apparatus.
Unlike the X-ray CT apparatus 1 described above, the X-ray CT apparatus 2 performs an operation so that the designated target imaging area 57 is subjected to CT imaging, whereby a later-described target imaging area moving unit 39 causes the table 74 and X The line measuring optical system 73 is automatically moved appropriately.
Further, the X-ray CT apparatus 1 does not have the tilt function of the X-ray detector 12, but the present invention can also be applied to the case where the X-ray detector 72 tilts, and therefore the X-ray CT apparatus 2 has a tilt function. The structure will be described.
In addition, about the thing similar to the X-ray CT apparatus 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The X-ray source 71 includes an X-ray tube that irradiates fluoroscopic X-rays in a conical shape toward the X-ray detector 72. When the X-ray source 71 and the X-ray detector 72 are at the origin position, the X-ray optical axis connecting the X-ray source 71 and the center of the detection surface of the X-ray detector 72 is in the z direction. An X-ray source 71 and an X-ray detector 72 are arranged. In the X-ray CT apparatus 2, the X-ray source 71 is fixed.
The X-ray detector 72 is formed so as to be able to tilt and move around the X-ray source 71 in the xz plane and to be translated in the X-ray source 71 direction. The distance SID between the X-ray source 71 and the X-ray detector 72 can be adjusted by moving the X-ray detector 72 toward the X-ray source 71 (referred to as SID axis adjustment).

The table 74 includes three moving bodies including a lower plate-like body 74b, a middle plate-like body 74c, and an upper plate-like body 74a. The subject is placed on the upper plate 74a formed of a horizontal surface.
The lower plate-like body 74b is capable of translational movement in the x direction, the y direction, and the z direction. The distance SOD between the X-ray source 71 and the subject can be adjusted by moving the lower plate 74b of the table 74 in the x direction or the z direction (referred to as SOD axis adjustment).

The middle plate-like body 74c of the table 74 is configured to be rotatable about the rotation axis (θ axis) in the z direction with respect to the lower plate-like body 74b, and the subject placed on the upper plate-like body 74a is selected. , And can be rotated around this axis.
The upper plate 74a of the table 74 can be translated in the x and y directions on the middle plate 74c. By moving the upper plate 74a in the x and y directions with respect to the rotation center (θ axis), the portion of the subject placed on the upper plate 74a to be imaged can be aligned with the rotation center. (Referred to as θx axis / θy axis adjustment).

  The function that the CPU 21 processes in the computer 80 will be described as a block. The data storage control unit 40, the fluoroscopic X-ray image display storage control unit 31, the CT imaging execution unit 34, the reconstruction calculation unit 35, and the drive signal generation Part 32. In addition, the data storage control unit 40 includes a trial photographing fluoroscopic X-ray image display unit 37, a target imaging region moving unit 39, and a target imaging region display unit 38. Further, the memory 25 includes a fluoroscopic X-ray image data storage area 41 for storing fluoroscopic X-ray image data, a position data storage area 43, and a target imaging area data storage area 44 for storing target imaging area data.

  The position data storage area 43 stores reference coordinates (xyz coordinates), which is a three-dimensional coordinate system set in the X-ray CT apparatus, and a central plate-like body by a drive signal output from the drive signal generator 32. The current position (xt, yt, zt) and rotation angle (θt) of the 74c in the xyz coordinates, the position (θx, θy) of the upper plate 74a on the middle plate 74c, and the X-ray detector The position data of the current position (xi, zi) with 72 xyz coordinates is stored.

  The drive signal generator 32 outputs a drive signal for moving the table 74 to the table drive mechanism 76, and outputs a drive signal for moving the X-ray detector 72 to the X-ray measurement optical system drive mechanism 75. Control is performed to store the positions of the plate-like body 74 c, the upper plate-like body 74 a and the X-ray detector 72 in the position data storage area 43. Furthermore, the control which moves the table 74 and the X-ray detector 72 is performed by receiving the automation signal mentioned later.

The target imaging area moving unit 39 designates the target imaging area data indicating the target imaging area 57 as the target imaging area data storage area by designating a part of the area in the trial radiograph X-ray image 54 as the target imaging area 57. 44, at least twice for reasons described later, and based on the fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41 and the position data in the position data storage area 43, the designated target imaging area 57 is subjected to CT imaging. By performing the calculation as described above, control for outputting an automation signal for moving the table 74 and the X-ray detector 72 is performed.
For example, as shown in FIG. 8 and FIG. 9, the first target imaging region 57a is included in the first fluoroscopic X-ray image 54a so as to include the region of interest O by various operations of the keyboard 22a and the mouse 22b. A square (broken line) to be shown is displayed as an image. Thus, the region of the fluoroscopic X-ray that has passed through the first target imaging region 57a is calculated when the X-ray measuring optical system 73 that has captured the first fluoroscopic X-ray image 54a and the subject M have a positional relationship. . A trapezoid (shown by a broken line) indicating a first target imaging region 57a (a quadrangular pyramid region for detecting a fluoroscopic X-ray) that becomes a region including a fluoroscopic X-ray that has passed through the region of interest O is the second fluoroscopic X. The image is displayed superimposed on the line image 54b. In addition, by various operations of the keyboard 22a and the mouse 22b, a quadrilateral (solid line) that indicates the second target imaging region 57b so as to include the region of interest O also in the second fluoroscopic X-ray image 54b is an image. Is displayed. As a result, when the X-ray measurement optical system 73 that captures the second fluoroscopic X-ray image 54b and the subject M are in a positional relationship, the second object is a region including the fluoroscopic X-ray that has passed through the region of interest O. The fluoroscopic X-ray area that has passed through the imaging area 57b is calculated. Thus, by specifying the target imaging region 57 at least twice, the target imaging region 57 can be narrowed in three dimensions. As a result, the table 74, the X-ray measurement optical system 73, the target imaging region 57, The first target imaging region 57a (a quadrangular pyramid region for detecting fluoroscopic X-rays) and the second target imaging region 57b (a quadrangular pyramid region for detecting fluoroscopic X-rays) overlap using the positional relationship of An automatic signal is output to the drive signal generator 32 by performing an operation so that the smallest cylindrical shape including the target imaging region 57 is CT-captured. Therefore, a tomographic image of the target area O of the subject M can be easily obtained by appropriately moving the subject M automatically.
FIG. 8 illustrates the positional relationship between the subject M and the X-ray measurement optical system 73 in an easy-to-understand manner. The X-ray source 71 and the X-ray detector are fixed by fixing the subject M instead of the X-ray source 71. It is described as if 72 rotates around the subject M to become an X-ray source 71 ′ and an X-ray detector 72 ′.

Next, a procedure for displaying an enlarged tomographic image of the region of interest O of the subject M by the X-ray CT apparatus 2 will be described. FIGS. 10 a and 10 b are flowcharts for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus 2.
In addition, since the process of step S201-214 is substantially the same as the process of step S101-114 of the X-ray CT apparatus 1, the description is abbreviate | omitted.

  In the processing of step S215, the target imaging area moving unit 39 uses the positional relationship among the target imaging area 57, the X-ray source 71, the X-ray detector 72, and the table 74 to correspond to the target imaging area 57 (for example, a rectangular shape). By performing an operation so that CT imaging is performed on a region where each quadrangular pyramid region overlapped), an automation signal for automatically moving the X-ray detector 72 and the table 74 is output. The drive signal generator 32 that has received the automation signal outputs a drive signal for moving the X-ray detector 72 and the table 74 to the table drive mechanism 75 and the X-ray measurement optical system drive mechanism 76.

  Next, in the process of step S216, after the X-ray detector 72 and the table 74 are moved, the CT imaging execution unit 34 rotates the middle plate-like body 74c about the rotation axis for each minute rotation angle, thereby moving the subject M. The CT imaging signal is output to the drive signal generator 32 so that the fluoroscopic X-ray images are sequentially captured. Then, the drive signal generation unit 32 that has received the CT imaging signal outputs a drive signal for moving the middle plate-like body 74 c to the table drive mechanism 76. Each time the CT imaging execution unit 34 is rotated by a small angle by the table driving mechanism 76, it images a fluoroscopic X-ray image and accumulates the respective fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41.

Next, in the processing of step S217, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject M using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.
Finally, when the process of step S217 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus 2, a fluoroscopic X-ray image detection region designated as a region slightly larger than the region of interest from two directions (for example, a region where each quadrangular pyramid region corresponding to a quadrangular shape overlaps). By calculating the minimum cylindrical shape so that the target imaging region 57 indicating CT is captured by the CT, the target imaging region moving unit 39 appropriately and automatically moves the subject M and the X-ray measurement optical system 73, so that the subject M A tomographic image of the region of interest O can be easily obtained.
Therefore, first, it is not necessary to perform CT imaging on a subject M in a relatively large area including the region of interest O, and CT imaging can be performed on a region slightly larger than the region of interest O of the subject M in the first CT imaging.

(Embodiment 3)
FIG. 11 is a block diagram showing a partial configuration of another X-ray CT apparatus according to the present invention. In the X-ray CT apparatus 3, unlike the X-ray CT apparatus 2 described above, the data storage control unit 40 is changed to a data storage control unit 60 described later in the function processed by the CPU 21.
In the X-ray CT apparatus 3, as in the X-ray CT apparatus 2 described above, at least two pieces of fluoroscopic X-ray image data are stored in the fluoroscopic X-ray image data storage area 41 in advance, and then a trial radiographic X-ray image is obtained. Instead of designating the target imaging region 57 after displaying at least two fluoroscopic X-ray images simultaneously as 54, the X-ray CT apparatus 3 creates a fluoroscopic X-ray image in which the target imaging region 67 is designated, A fluoroscopic X-ray image indicating the current positional relationship at this time is stored in the fluoroscopic X-ray image data storage area 41 as one of the trial X-ray fluoroscopic X-ray images 64, and at the same time, the designated target imaging area 67 is The image is stored in the imaging area data storage area 44. In other words, on the monitor screen 23a, the fluoroscopic X-ray images of two or more planes are not displayed at the same time, but the fluoroscopic X-ray images indicating the current positional relationship of only one plane are always displayed and executed.
In addition, about the thing similar to the X-ray CT apparatus 2, while attaching | subjecting the same code | symbol, the description is abbreviate | omitted.

The data storage control unit 60 includes a target imaging area data storage control unit 61 and a target imaging area update display unit 62.
The target imaging region data storage control unit 61 displays a fluoroscopic X-ray image in which the X-ray source 71, the X-ray detector 72, and the table 74 are associated with the current positional relationship while displaying an image. Is designated as the target imaging area 67 by an input operation using the keyboard 22a or the mouse 22b, and the target imaging area data indicating the first target imaging area 67a is stored in the target imaging area data storage area 44. Control to be performed.
For example, as shown in FIG. 12A, the lower plate-like body 74b is moved so as to obtain a fluoroscopic X-ray image of the entire region of the subject M, and the current positional relationship between the X-ray detector 72 and the table 74 is obtained. Is displayed as a first target imaging region 67a so as to include the region of interest O by an input operation with the keyboard 22a or the mouse 22b in a state where a fluoroscopic X-ray image associated with is displayed. Is displayed and a shooting signal is input. Thereby, the fluoroscopic X-ray image at this time is stored in the fluoroscopic X-ray image display storage control unit 31 as the first fluoroscopic X-ray image 64a that is one of the trial radiographic X-ray images 64, and at the same time, The imaging area data storage control unit 61 is an area including fluoroscopic X-rays that have passed through the region of interest O when the X-ray measurement optical system 73 that has captured the first fluoroscopic X-ray image 64a and the subject M are in a positional relationship. The region of the fluoroscopic X-ray that has passed through the first target imaging region 67a (the quadrangular pyramid region for detecting the fluoroscopic X-ray) is also calculated and stored.

The target imaging area update display unit 62 is a fluoroscopic X-ray in which the current positional relationship among the X-ray source 71, the X-ray detector 72, and the table 74 is associated with the movement of the table 74 and the X-ray detector 72. The first target imaging area 67a is superimposed on the image (after the first fluoroscopic X-ray image 64a is stored, the second fluoroscopic X-ray image 64b) is displayed, and the table 74 and X-rays are displayed. In conjunction with the movement of the detector 72, control is performed to update the first target imaging area 67a for image display.
For example, as shown in FIG. 12B, the central plate-like body 74c is rotated by 90 °, and a fluoroscopic X-ray image (second image) in which the current positional relationship between the X-ray detector 72 and the table 74 is associated. In the state where the fluoroscopic X-ray image 64b) is displayed, a trapezoid (shown by a broken line) indicating the first target imaging region 67a (a quadrangular pyramid region for detecting fluoroscopic X-rays) is displayed as the second fluoroscopic X-ray. The image is displayed superimposed on the image 64b.
The target imaging area data storage control unit 61 displays the second fluoroscopic X-ray image 64b from the different directions so as to include the region of interest O by an input operation using the keyboard 22a and the mouse 22b. A square image may be displayed as the second target imaging region. Thereby, the fluoroscopic X-ray image at this time is stored in the fluoroscopic X-ray image display storage control unit 31 as the second fluoroscopic X-ray image 64b which is one of the trial radiographic X-ray images 64, and at the same time, An area including fluoroscopic X-rays that have passed through the region of interest O when the imaging area data storage control unit 61 has a positional relationship between the subject M and the X-ray measurement optical system 73 that has captured the second fluoroscopic X-ray image 64b. The X-ray area for fluoroscopy that has passed through the second target imaging area is calculated and stored. Thereafter, the fluoroscopic X-ray image in which the current positional relationship between the X-ray detector 72 and the table 74 is associated becomes the third fluoroscopic X-ray image after storing the second fluoroscopic X-ray image.

Next, a procedure for displaying an enlarged tomographic image of the region of interest O of the subject M by the X-ray CT apparatus 3 will be described. FIG. 13 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus.
First, in step S301, the subject M is placed on the table 74.
Next, in the process of step S302, the fluoroscopic X-ray image display storage control unit 31 displays an image of the fluoroscopic X-ray image on the monitor screen 23a based on the video signal (see FIGS. 16 and 17). That is, a fluoroscopic X-ray image indicating the current positional relationship between the subject M and the X-ray measurement optical system 73 is displayed as an image.

Next, in the process of step S303, a numerical parameter t representing the number of fluoroscopic X-ray images to be stored and the target imaging area is stored as 0.
Next, in the process of step S304, the table 74 and the X-rays so that an X-ray transmission image of the entire area of the subject M is obtained by an input operation of moving the table 74 and the X-ray detector 72 using the keyboard 22a and the mouse 22b. The detector 72 is moved to adjust xt, yt, zt, θx, θy, xi, zi (that is, adjustment of the SOD axis, θx axis / θy axis, SID axis, etc.). For example, the operator moves the table 74 and the X-ray detector 72 so as to obtain a fluoroscopic X-ray image in which the entire image of the subject M as shown in FIG.
Next, after the alignment is performed so that the entire region of the subject M becomes a fluoroscopic X-ray image, in the process of step S305, a part of the fluoroscopic X-ray image is input by the keyboard 22a or the mouse 22b. Is designated as the t-th target imaging region 67 so as to include the region of interest O. For example, as shown in FIG. 12A, the operator has a quadrilateral that indicates the first target imaging region 67a in the fluoroscopic X-ray image (the first fluoroscopic X-ray image 64a) indicating the current positional relationship. (Shown by a broken line) is displayed as an image and a photographing signal is input.

Next, in the process of step S <b> 306, the target imaging area data storage control unit 61 stores the target imaging area data as the t-th target imaging area 67 in the target imaging area data storage area 44. At this time, at the same time that the target imaging area data is stored, the fluoroscopic X-ray image display storage control unit 31 uses the current fluoroscopic X-ray image 64a as one of the trial radiographic X-ray images 64 as the current fluoroscopic X-ray image 64a. A fluoroscopic X-ray image indicating the positional relationship is stored.
Next, in the processing of step S307, it is determined whether or not the fluoroscopic X-ray image data and the target imaging area data are still stored by an input operation using the keyboard 22a or the mouse 22b. If it is determined that the fluoroscopic X-ray image 64 and the target imaging area 67 are to be stored, t = t + 1 is stored by proceeding to step S308, and the process returns to step S304. That is, the processes in steps S304 to S307 are repeatedly executed until it is determined that the fluoroscopic X-ray image data and the target imaging area data are no longer stored. Note that, after the process of step S306 of t = 0, the target imaging area update display unit 62, based on the target imaging area data stored in the target imaging area data storage area 44, includes the X-ray source 71 and the X-ray detector 72. In addition, the target imaging region 67 is superimposed on the second fluoroscopic X-ray image 64b associated with the current positional relationship of the table 74, and the image is displayed in conjunction with the movement of the table 74 and the X-ray detector 72. The target imaging area 67 to be displayed is updated. For example, as shown in FIG. 12B, a trapezoid (indicated by a broken line) indicating a first target imaging area 67a (a quadrangular pyramid area for detecting a fluoroscopic X-ray) is displayed in the second fluoroscopic X-ray image 64b. indicate.

  On the other hand, if it is determined that the fluoroscopic X-ray image data and the target imaging area data are no longer stored, the table 74 or X-ray detection is performed so that a tomographic image of the region of interest O of the subject M is obtained in the process of step S309. An input operation for moving the device 72 is performed, and adjustment of xt, yt, zt, θx, θy, xi, zi (adjustment of the SOD axis, θx axis / θy axis, SID axis, etc.) is performed. At this time, the target imaging area 67a is superimposed and displayed on the second fluoroscopic X-ray image 64b, and the target imaging area 67a to display the image is updated in conjunction with the movement of the table 74 and the X-ray detector 72. Therefore, the subject M can be moved appropriately. That is, since the target imageable region 67 that is the region including the region of interest O is superimposed on the second X-ray transmission image 64b and displayed as an image, the region of the subject M to be subjected to CT imaging is grasped three-dimensionally. can do.

  Next, in the process of step S310, after the alignment is performed, the CT imaging execution unit 34 moves the central plate-like body 74c around the rotation axis at every minute rotation angle (Δθ) by an input operation for performing CT imaging. The CT imaging signal is output to the drive signal generator 32 so that the fluoroscopic X-ray images of the subject M are sequentially photographed. Then, the drive signal generator 32 that has received the CT imaging signal outputs a drive signal for rotating the middle plate-like body 74 c to the table drive mechanism 76. At this time, fluoroscopic X-ray images are taken and the respective fluoroscopic X-ray image data are stored in the fluoroscopic X-ray image data storage area 41.

Next, in the process of step S <b> 311, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject M using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.
Finally, when the process of step S311 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus, the target imaging region 67 including the region of interest O indicates the range of the tomographic image obtained when performing CT imaging before performing CT imaging. Can be confirmed in a three-dimensional manner on a fluoroscopic X-ray image (second fluoroscopic X-ray image 64b) showing the current positional relationship on which X is superimposed. The setting operation can be advanced.
Therefore, first, it is not necessary to perform CT imaging on a subject M in a relatively large area including the region of interest O, and CT imaging can be performed on a region slightly larger than the region of interest O of the subject M in the first CT imaging.

(Embodiment 4)
FIG. 14 is a block diagram showing a partial configuration of another X-ray CT apparatus according to the present invention. In the X-ray CT apparatus, unlike the X-ray CT apparatus 3 described above, a target imaging area moving unit 39 (to be described later) performs table 74 and X-ray detection by performing calculations so that a designated target imaging area is CT-scanned. The device 72 is automatically moved appropriately. In addition, about the thing similar to the X-ray CT apparatus 3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The data storage control unit 70 includes a first target imaging region data storage control unit 71, a second target imaging region data storage control unit 72, and a target imaging region movement unit 39.
The first target imaging area data storage control unit 71 displays a fluoroscopic X-ray image in which the X-ray source 71, the X-ray detector 72, and the table 74 are associated with the current positional relationship. The first target imaging region is specified by an input operation using the keyboard 22a or the mouse 22b so that a partial region of the line image includes the region of interest as the first target imaging region, and an imaging signal is input. Control is performed to store the target imaging area data in the target imaging area data storage area 44 as data.

  The second target imaging area data storage control unit 72 is photographed from a direction different from that of the first fluoroscopic X-ray image and is associated with the current positional relationship of the X-ray source 71, the X-ray detector 72, and the table 74. In a state where an X-ray image is displayed, a part of the fluoroscopic X-ray image is designated by an input operation using the keyboard 22a and the mouse 22b so as to include a region of interest as a second target imaging region, and imaging is performed. When the signal is input, control is performed to store the target imaging area data in the target imaging area data storage area 44 as the second target imaging area.

Next, a procedure for displaying an enlarged tomographic image of the region of interest of the subject using the X-ray CT apparatus 4 will be described. FIG. 15 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus 4.
First, in step S401, the subject is placed on the table 74.
Next, in the process of step S402, the fluoroscopic X-ray image display storage control unit 31 displays an image of the fluoroscopic X-ray image on the monitor screen 23a based on the video signal (see FIGS. 16 and 17). That is, a fluoroscopic X-ray image indicating the current positional relationship between the subject and the X-ray measurement optical system 73 is displayed as an image.

Next, in the process of step S403, a numerical parameter t indicating the number of fluoroscopic X-ray images to be stored and the target imaging area is stored as 0.
Next, in the process of step S404, the table 74 and the X-ray detection are performed so that a transparent X-ray image of the entire area of the subject is obtained by an input operation of moving the table 74 and the X-ray detector 72 using the keyboard 22a and the mouse 22b. The device 72 is moved to adjust xt, yt, zt, θx, θy, xi, zi (that is, adjustment of the SOD axis, θx axis / θy axis, SID axis, etc.).
Next, after the alignment is performed so that the entire region of the subject becomes a fluoroscopic X-ray image, in the processing of step S405, a part of the region in the fluoroscopic X-ray image is input by the keyboard 22a or the mouse 22b. The imaging signal is input as the t-th target imaging region so as to include the region of interest.

Next, in the process of step S406, when t = 0, the first target imaging area data storage control unit 71 stores the target imaging area data in the target imaging area data storage area 44 as the tth target imaging area. On the other hand, when t ≧ 1, the second target imaging area data storage control unit 72 stores the target imaging area data in the target imaging area data storage area 44 as the t-th target imaging area. At this time, simultaneously with storing the target imaging area data, the fluoroscopic X-ray image display storage control unit 31 stores a fluoroscopic X-ray image indicating the current positional relationship as one of the trial radiographic X-ray images. .
In the process of step S407, it is determined whether or not the fluoroscopic X-ray image data and the target imaging area data are still stored by an input operation using the keyboard 22a or the mouse 22b. If it is determined that the fluoroscopic X-ray image data and the target imaging area data are to be stored, t = t + 1 is stored by proceeding to step S408, and the process returns to step S404. That is, the processes in steps S404 to S407 are repeatedly executed until it is determined that the fluoroscopic X-ray image data and the target imaging area data are no longer stored. In the present invention, in order to proceed to the processing in step S409, at least two fluoroscopic X-ray images are required, and therefore it is essential that t ≧ 1.

  On the other hand, when it is determined that the fluoroscopic X-ray image data and the target imaging area data are no longer stored, in the process of step S409, the target imaging area moving unit 39 determines that the target imaging area, the X-ray source 71, and the X-ray detector are used. Using the positional relationship between 72 and the table 74, an automation signal for automatically moving the X-ray detector 72 and the table 74 is output so that the target imaging region that is the region including the region of interest is CT-captured. The drive signal generator 32 that has received the automation signal outputs a drive signal for moving the X-ray detector 72 and the table 74 to the table drive mechanism 75 and the X-ray measurement optical system drive mechanism 76.

  Next, in the process of step S410, after the X-ray detector 72 and the table 74 are moved, the CT imaging execution unit 34 rotates and moves the middle plate-like body 74c around the rotation axis for each minute rotation angle. A CT imaging signal is output to the drive signal generator 32 so that the fluoroscopic X-ray images are sequentially captured. The drive signal generator 32 that has received the CT imaging signal outputs a drive signal for moving the middle plate-like body 14 c to the table drive mechanism 76. Each time the CT imaging execution unit 34 is rotated by a small angle by the table driving mechanism 76, it images a fluoroscopic X-ray image and accumulates the respective fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41.

Next, in the processing of step S411, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.
Finally, when the process of step S411 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus 4, a fluoroscopic X-ray image detection region designated as a region slightly larger than the region of interest from two directions (for example, a region where each quadrangular pyramid region corresponding to a quadrangular shape overlaps). The target imaging region moving unit 39 appropriately moves the subject and the X-ray measurement optical system 73 automatically by calculating the minimum cylindrical shape so that the target imaging region showing the CT is captured by CT, and the subject M is interested. A tomographic image of the region can be easily obtained.
Therefore, first, it is not necessary to perform CT imaging of a relatively large subject including the region of interest, and CT imaging of a region slightly larger than the region of interest of the subject can be performed in the first CT imaging.

(Embodiment 5)
18a is a block diagram showing a configuration of an X-ray CT apparatus according to another embodiment of the present invention, and FIG. 18b is a detailed view of a range C shown in FIG. 18a. The X-ray CT apparatus 5 includes an X-ray measurement optical system 173 integrally including an X-ray source 171 and an X-ray detector 172, a table 174 on which a subject is placed, a table drive mechanism 176, and X-ray measurement optics. The system drive mechanism 175 and a control system (computer) 180 that controls the entire X-ray CT apparatus are configured.
Unlike the X-ray CT apparatus 1 described above, the X-ray CT apparatus 5 performs an operation so that the designated target imaging area 157 is subjected to CT imaging, whereby a later-described target imaging area moving unit 139 causes the table 174 and X The line measurement optical system 173 is automatically moved appropriately.
The X-ray CT apparatus 1 does not have the tilt function of the X-ray measurement optical system 173. However, the present invention can be applied to the case where the X-ray measurement optical system 173 tilts. A structure having a function will be described.
In addition, about the thing similar to the X-ray CT apparatus 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

The X-ray source 171 has an X-ray tube that irradiates fluoroscopic X-rays conically toward the center of the detection surface of the X-ray detector 172. When the X-ray source 171 and the X-ray detector 172 are in the initial state, the X-ray optical axis connecting the X-ray source 171 and the detection surface center of the X-ray detector 172 is in the x direction. An X-ray source 171 and an X-ray detector 172 are arranged.
The X-ray source 171 and the X-ray detector 172 tilt between the X-ray source 171 and the X-ray detector 172 in the xz plane about a rotation axis (ψ axis) 177 that is perpendicular to the x direction. They are connected by a C-arm 178 so that they can be moved. Thus, the direction in which the X-ray source 171 irradiates the subject with X-ray for fluoroscopy can be adjusted by rotating the X-ray measurement optical system 173 about the ψ axis (ψ Axis adjustment).
Further, the X-ray source 171 and the X-ray detector 172 can be translated along the C-arm 178 so as to change the distance between the X-ray source 171 and the X-ray detector 172. Formed (referred to as ψs / ψi adjustment). That is, the distance SID between the X-ray source 171 and the X-ray detector 172 can be adjusted (referred to as SID axis adjustment).

The table 174 is composed of three moving bodies including a lower plate-shaped body 174b, a middle plate-shaped body 174c, and an upper plate-shaped body 174a. The subject is placed on an upper plate-like body 174a having a horizontal surface.
The lower plate-like body 174b is configured to be able to translate in the x direction, the y direction, and the z direction. The distance SOD between the X-ray source 171 and the subject can be adjusted by moving the lower plate-like body 174b of the table 174 in the x direction or the z direction (referred to as SOD axis adjustment).

The middle plate 174c of the table 174 is configured to be rotatable with respect to the lower plate 174b by a rotation axis (θ axis) in the z direction, and a subject placed on the upper plate 174a is selected. , And can be rotated around this axis.
The upper plate 174a of the table 174 is configured to be able to translate in the x and y directions on the middle plate 174c. By moving the upper plate 174a in the x and y directions with respect to the rotation center (θ-axis), the portion of the subject placed on the upper plate 74a to be imaged can be adjusted to the rotation center. (Referred to as θx axis / θy axis adjustment).

  The functions processed by the CPU 21 in the computer 180 will be described as a block. The data storage control unit 140, the fluoroscopic X-ray image display storage control unit 31, the CT imaging execution unit 34, the reconstruction calculation unit 35, and the drive signal generation Part 132. In addition, the data storage control unit 140 includes a trial photographing fluoroscopic X-ray image display unit 37, a target imaging region moving unit 139, and a target imaging region display unit 38. Furthermore, the memory 25 includes a fluoroscopic X-ray image data storage area 41 for storing fluoroscopic X-ray image data, a position data storage area 143, and a target imaging area data storage area 44 for storing target imaging area data.

  The position data storage area 143 stores reference coordinates (xyz coordinates), which is a three-dimensional coordinate system set in the X-ray CT apparatus 5, and uses a drive signal output from the drive signal generator 132 to generate a central plate shape. Current position (xt, yt, zt) and rotation angle (θt) of the body 174c in the xyz coordinates, position (θx, θy) of the upper plate 174a on the middle plate 174c, X-ray measurement optical system The rotation angle (ψ) of 173 and the position data of the position (ψs) of the X-ray source 171 and the position (ψi) of the X-ray detector 172 in the X-ray measurement optical system 173 are stored.

  The drive signal generator 132 outputs a drive signal for moving the table 174 to the table drive mechanism 176, outputs a drive signal for moving the X-ray measurement optical system 173 to the X-ray measurement optical system drive mechanism 175, and Control is performed to store the positions of the middle plate 174c, the upper plate 174a, the X-ray measurement optical system 173, the X-ray source 171 and the X-ray detector 172 in the position data storage area 143. Furthermore, control which moves the table 74 and the X-ray measurement optical system 173 is performed by receiving the automation signal mentioned later.

Based on the video signal output from the X-ray detector 172, the fluoroscopic X-ray image display storage control unit 31 associates the current positional relationship between the table 174 and the X-ray measurement optical system 173 with the monitor screen 23a. In addition, the fluoroscopic X-ray image is displayed, and the radiographic X-ray image data is stored in the fluoroscopic X-ray image data storage area 41 by receiving imaging signals from the keyboard 22a and the mouse 22b. At this time, the fluoroscopic X-ray image data includes the position (xt, zt) and rotation angle (θt) of the middle plate 174c, the position (θx, θy) of the upper plate 174a on the middle plate 174c, Corresponding to the rotation angle (ψ) of the X-ray measurement optical system 173 and the position data of the position (ψs) of the X-ray source 171 and the position (ψi) of the X-ray detector 172 in the X-ray measurement optical system 173, It is stored in the fluoroscopic X-ray image data storage area 41.
For example, as shown in FIG. 19, first, the lower member 174b is moved so as to obtain a fluoroscopic X-ray image of the entire area of the subject M, and the first fluoroscopic X-ray image of the subject M is executed. Further, the middle plate-like body 174c is rotated by 30 ° about the θ axis, and then the X-ray measurement optical system 173 is rotated by 60 ° about the ψ axis, so that the second fluoroscopic X-ray image of the subject M is executed. FIG. 19 illustrates the positional relationship between the subject M and the X-ray measurement optical system 173 in an easy-to-understand manner. The subject M is fixed, and the X-ray source 171 and the X-ray detector 172 are connected to the X-ray source 171 ′ and It is described as if it moved to become an X-ray detector 172 ′.

The target imaging area moving unit 139 designates a target imaging area data indicating the target imaging area 157 as a target imaging area data storage area by designating a partial area in the trial radiographic fluoroscopic X-ray image 154 as the target imaging area 157. 44, at least twice for reasons described later, and based on the fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41 and the position data in the position data storage area 143, the designated target imaging area 157 is CT-photographed. By performing the calculation as described above, control for outputting an automation signal for moving the table 174 and the X-ray measurement optical system 173 is performed.
For example, as shown in FIG. 20, the first target imaging region 157a is shown in the first fluoroscopic X-ray image 154a so as to include the region of interest O by various operations of the keyboard 22a and the mouse 22b. A quadrangle (broken line) is displayed as an image. Thereby, when the X-ray measurement optical system 173 that has captured the first fluoroscopic X-ray image 154a is in a positional relationship with the subject M, the fluoroscopic X-ray area that has passed through the first target imaging area 157a is calculated. . A trapezoid (shown by a broken line) indicating a first target imaging region 157a (a quadrangular pyramid region for detecting a fluoroscopic X-ray) that becomes a region including a fluoroscopic X-ray that has passed through the region of interest O is the second fluoroscopic X. The image is displayed superimposed on the line image 154b.
Further, by various operations of the keyboard 22a and the mouse 22b, a quadrilateral (solid line) indicating the second target imaging region 157b so that the region of interest O is also included in the second fluoroscopic X-ray image 154b is an image. Is displayed. As a result, when the X-ray measurement optical system 173 that has captured the second fluoroscopic X-ray image 154b and the subject M are in a positional relationship, the second object is a region including the fluoroscopic X-ray that has passed through the region of interest O. The fluoroscopic X-ray area that has passed through the imaging area 157b is calculated. Thus, by specifying the target imaging area 157 at least twice, the target imaging area 157 can be narrowed in three dimensions. As a result, the table 174, the X-ray measurement optical system 173, the target imaging area 157, Using the positional relationship, the direction in which the X-ray source 171 emits fluoroscopic X-rays is perpendicular to the rotation axis (θ axis) around which the table 174 rotates, and the first target imaging region 157a (transparent X-ray). The minimum cylindrical shape including the target imaging region 157, which is a region where a quadrangular pyramid region for detecting a line) and a second target imaging region 157b (a quadrangular pyramid region for detecting fluoroscopic X-rays) overlap, is CT-photographed. By performing the calculation, an automation signal is output to the drive signal generator 132. Therefore, a tomographic image of the target area O of the subject M can be easily obtained by appropriately automatically moving the table 174 and the X-ray measurement optical system 173.

Next, a procedure for displaying an enlarged tomographic image of the region of interest O of the subject M by the X-ray CT apparatus 5 will be described. FIG. 21 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus 5.
In addition, since the process of step S501-503 is substantially the same as the process of step S101-103 of the X-ray CT apparatus 1, the description is abbreviate | omitted.

In the process of step S504, the table 174 and the X-ray measurement optical system 173 are moved by the input operation using the keyboard 22a and the mouse 22b so that a fluoroscopic X-ray image of the entire area of the subject M is obtained, and xt, yt, zt , Θx, θy, ψ, ψs, ψi are adjusted (that is, adjustment of the SOD axis, z axis, θx axis / θy axis, SID axis, ψ axis, etc.). For example, the operator moves the table 174 and the X-ray measurement optical system 173 so as to obtain a fluoroscopic X-ray image in which the entire image of the subject M is shown as shown in FIG. At this time, only the fluoroscopic X-ray image indicating the current positional relationship between the table 174 and the X-ray measurement optical system 173 is displayed on the monitor screen 23a.
Next, after positioning so that it becomes a fluoroscopic X-ray image of the whole area | region of the to-be-photographed object M, in a process of step S505, a radiographic X-ray image display is performed by inputting an imaging | photography signal with the keyboard 22a or the mouse | mouth 22b. The storage control unit 31 captures the t th fluoroscopic X-ray image.
Next, in the process of step S <b> 506, the fluoroscopic X-ray image display storage control unit 31 stores the t-th fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41.

Next, in the process of step S507, it is determined whether or not the fluoroscopic X-ray image data is still stored by an input operation using the keyboard 22a or the mouse 22b. If it is determined that the fluoroscopic X-ray image data is to be stored, t = t + 1 is stored by proceeding to step S508, and the process returns to step S504. That is, the processes in steps S504 to S507 are repeatedly executed until it is determined that the fluoroscopic X-ray image data is not stored. In the present invention, in order to proceed to the processing in step S509, at least two fluoroscopic X-ray images are necessary, and therefore it is essential that t ≧ 1.
On the other hand, if it is determined that the fluoroscopic X-ray image data is not stored, in the process of step S509, the trial radiographic X-ray image display unit 37 stores the fluoroscopic X-ray image stored in the fluoroscopic X-ray image data storage area 41. Using the data, an image of the trial radiograph X-ray image 154 is displayed on the monitor screen 23a. For example, as shown in FIG. 20, the first perspective X-ray image 154a and the second perspective X-ray image 154b are displayed.

Next, in the process of step S510, the designated parameter s indicating the number of target imaging areas to be designated is stored as 0.
Next, in the process of step S511, a part of the area in one side of the trial radiograph X-ray image 154 (the first fluoroscopic X-ray image 154a or the second fluoroscopic X-ray image 154b) is a keyboard 22a or a mouse 22b. Is designated as the target imaging region 157 by the input operation. For example, as shown in FIG. 20, the operator causes the first fluoroscopic X-ray image 154a to display an image of a quadrangle (indicated by a broken line) that indicates the first target imaging region 157a.

  Next, in the process of step S512, the target imaging area display unit 38 stores the fluoroscopic X-ray image data by designating a part of the area in one surface of the trial radiograph X-ray image 154 as the target imaging area 157. Based on the fluoroscopic X-ray image data of the area 41 and the position data of the position data storage area 143, the designated target imaging area 157 is superimposed on another fluoroscopic X-ray image of the trial radiographic X-ray image 154 to display an image. . For example, if the first target imaging region 157a is designated and displayed on the first fluoroscopic X-ray image 154a, the first target imaging region is displayed on the second fluoroscopic X-ray image 154b as shown in FIG. A trapezoid (shown by a broken line) indicating 157a (a quadrangular pyramid region for detecting fluoroscopic X-rays) is displayed as an image.

  Next, in the process of step S513, a partial area in the other fluoroscopic X-ray image of the trial radiograph X-ray image 154 is still designated as the target imaging area 157 by an input operation using the keyboard 22a or the mouse 22b. It is determined whether or not. If it is determined that the target imaging area 157 is designated, the process proceeds to step S514, s = s + 1 is stored, and the process returns to step S511. That is, the processes in steps S511 to S513 are repeatedly executed until it is determined that the target imaging area 157 is not designated. In the present invention, in order to proceed to the process of step S515, at least two fluoroscopic X-ray images are necessary, and therefore it is essential that t ≧ 1.

  On the other hand, if it is determined that the target imaging area 157 is no longer designated, the target imaging area moving unit 139 uses the positional relationship among the target imaging area 157, the X-ray measurement optical system 173, and the table 174 in the process of step S515. Thus, each imaging region 157 (for example, each quadrangular pyramid region in which the direction in which the X-ray source 171 irradiates fluoroscopic X-rays is perpendicular to the rotation axis (θ axis) around which the table 174 rotates and corresponds to a square shape. An automatic signal for automatically moving the X-ray measurement optical system 173 and the table 174 is output by performing calculation so that the CT region is overlapped). The drive signal generator 132 that has received the automation signal outputs a drive signal for moving the X-ray measurement optical system 173 and the table 174 to the table drive mechanism 175 and the X-ray measurement optical system drive mechanism 176.

  Next, in the process of step S516, after the X-ray measurement optical system 173 and the table 174 are moved, the CT imaging execution unit 34 rotates the middle plate-like body 174c for each minute rotation angle around the rotation axis (θ axis). A CT imaging signal is output to the drive signal generation unit 132 so that the fluoroscopic X-ray images of the subject M are sequentially captured. Then, the drive signal generator 132 that has received the CT imaging signal outputs a drive signal for moving the middle plate-like body 174c to the table drive mechanism 176. The CT imaging execution unit 34 captures a fluoroscopic X-ray image each time the table driving mechanism 176 rotates by a small angle, and accumulates the respective fluoroscopic X-ray image data in the fluoroscopic X-ray image data storage area 41.

Next, in the process of step S517, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject M using the fluoroscopic X-ray image data stored in the fluoroscopic X-ray image data storage area 41.
Finally, when the process of step S517 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus 5, a fluoroscopic X-ray image detection region (for example, the direction in which the X-ray source 171 irradiates fluoroscopic X-rays) designated as a region slightly larger than the region of interest from two directions. The minimum cylindrical shape is set so that the target imaging region 157 that is perpendicular to the rotation axis (θ-axis) around which the table 174 rotates and that overlaps each quadrangular pyramid region corresponding to the quadrilateral shape is CT-captured. By calculating, the tomographic image of the region of interest O of the subject M can be easily obtained by the target imaging region moving unit 139 appropriately automatically moving the subject M and the X-ray measurement optical system 173.
Therefore, first, it is not necessary to perform CT imaging on a subject M in a relatively large area including the region of interest O, and CT imaging can be performed on a region slightly larger than the region of interest O of the subject M in the first CT imaging.

(Other embodiments)
(1) In the X-ray inspection apparatuses 2 to 4 described above, the X-ray source 71 is fixed, but the X-ray detector 72 and the X-ray source 71 are integrally formed by a C arm or the like. The X-ray detector 72 and the X-ray source 71 in the yz plane may be configured to be capable of tilting and moving around a certain point.
(2) In the X-ray inspection apparatus 2 described above, the fluoroscopic X-ray image display storage control unit 31 first performs imaging of the first fluoroscopic X-ray image of the subject M, and then moves the X-ray detector 72. In this example, the second fluoroscopic X-ray image of the subject M is captured. First, the first fluoroscopic X-ray image of the subject M is captured, and then the X-ray detector. The second fluoroscopic X-ray image of the subject M may be executed by moving 72 or rotating the middle plate-like body 74c.

  INDUSTRIAL APPLICABILITY The present invention can be used in an industrial X-ray CT apparatus for obtaining a tomographic image in order to investigate an internal defect or an internal structure of an industrial product such as an electronic component without destroying it.

It is a block diagram which shows the structure of the X-ray CT apparatus which is one Embodiment of this invention. It is a detailed view of the range of A shown in FIG. It is a figure which shows the positional relationship of the two-surface fluoroscopic X-ray image used as a trial radiographic X-ray image. It is a figure which shows an example of the two-sided fluoroscopic X-ray image made into trial radiographic X-ray image. It is a figure which shows the positional relationship of the target imaging area designated with the trial radiography X-ray image. 3 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus of FIG. 1. 3 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus of FIG. 1. It is a block diagram which shows the structure of the X-ray CT apparatus which is other one Embodiment of this invention. FIG. 7b is a detailed view of the range B shown in FIG. 7a. It is a figure which shows the positional relationship of the two-surface fluoroscopic X-ray image used as a trial radiographic X-ray image. It is a figure which shows an example of the two-sided fluoroscopic X-ray image made into trial radiographic X-ray image. It is a flowchart for demonstrating an example of the method of displaying the enlarged tomographic image by the X-ray CT apparatus of FIG. It is a flowchart for demonstrating an example of the method of displaying the enlarged tomographic image by the X-ray CT apparatus of FIG. It is a block diagram which shows the structure of a part of X-ray CT apparatus which is other one Embodiment of this invention. It is a figure which shows an example of the two-sided fluoroscopic X-ray image made into trial radiographic X-ray image. 12 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus of FIG. 11. It is a block diagram which shows the structure of a part of X-ray CT apparatus which is other one Embodiment of this invention. 15 is a flowchart for explaining an example of a method for displaying an enlarged tomographic image by the X-ray CT apparatus of FIG. It is a figure which shows an example of the fluoroscopic X-ray image of the whole area | region of the capacitor | condenser displayed on the display apparatus. It is a figure which shows an example of the fluoroscopic X-ray image of the partial area | region of the capacitor | condenser displayed on the display apparatus. It is a block diagram which shows the structure of the X-ray CT apparatus which is other one Embodiment of this invention. FIG. 18b is a detailed view of a range C shown in FIG. 18a. It is a figure which shows the positional relationship of the two-surface fluoroscopic X-ray image used as a trial radiographic X-ray image. It is a figure which shows an example of the two-sided fluoroscopic X-ray image made into trial radiographic X-ray image. It is a flowchart for demonstrating an example of the method of displaying the enlarged tomographic image by the X-ray CT apparatus of FIG. It is a flowchart for demonstrating an example of the method of displaying the enlarged tomographic image by the X-ray CT apparatus of FIG.

Explanation of symbols

1, 2, 3, 4, 5: X-ray CT apparatus 11, 71, 171: X-ray source 12, 72, 172: X-ray detector 13, 73, 173: X-ray measuring optical system 14, 74, 174: Table 16, 76, 176: Table drive mechanism 20, 80, 180: Control system (computer)
21: CPU
22: Input device 23: Display device 24, 54, 64, 154: Trial fluoroscopic X-ray image 25: Memory (storage unit)
27, 57, 67, 157: Target imaging region 30, 40, 60, 70, 140: Data storage control unit 31: Perspective X-ray image display storage control unit 34: CT imaging execution unit 35: Reconstruction calculation unit 37: Trial Imaging fluoroscopic X-ray image display unit 38: Target imaging region display unit 39, 139: Target imaging region moving unit

Claims (11)

An X-ray measurement optical system having an X-ray detector that captures a fluoroscopic X-ray image of a subject and an X-ray source that irradiates the X-ray detector with fluoroscopic X-rays;
A table disposed between the X-ray source and the X-ray detector and capable of translational and rotational movement with the subject placed thereon;
A table drive mechanism for rotating and translating the table based on the drive signal;
An input device that is input to create the drive signal and the imaging signal and that is input to specify a target imaging region including a region of interest of the subject;
A display device for performing image display of a fluoroscopic X-ray image of the subject;
By capturing a fluoroscopic X-ray image of the subject, the X-ray source, X-ray detector, and table are associated with the current positional relationship of the X-ray source, the X-ray detector, and the table. A fluoroscopic X-ray image display storage control for storing fluoroscopic X-ray image data indicating a fluoroscopic X-ray image in which the positional relationship of the X-ray source, the X-ray detector, and the table is associated with each other by inputting a signal. And
By capturing a fluoroscopic X-ray image of the subject while rotating the table, a plurality of fluoroscopic X-ray image data in which the positional relationship among the X-ray source, the X-ray detector, and the table is associated is stored in the storage unit. A CT imaging execution unit for executing CT imaging;
An X-ray CT apparatus comprising a reconstruction calculation unit that reconstructs a tomographic image of a subject using a plurality of fluoroscopic X-ray image data stored by the CT imaging,
Before the CT imaging, using the at least two fluoroscopic X-ray image data stored by the fluoroscopic X-ray image display storage control unit, the first fluoroscopic X-ray image and the first fluoroscopic X-ray image of the subject And an image display of a trial radiographic X-ray image that is at least two fluoroscopic X-ray images including a second fluoroscopic X-ray image in a different direction, and a partial region of the first fluoroscopic X-ray image Is designated as the first target imaging area two-dimensionally by the input device, the target imaging area data representing the three-dimensional area corresponding to the first target imaging area is stored in the storage unit, and the trial is performed. An X-ray CT apparatus comprising a data storage control unit that associates a radiographic X-ray image with another fluoroscopic X-ray image. The data storage control unit simultaneously displays at least two fluoroscopic X-ray images including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A fluoroscopic X-ray image display unit;
A part of the first fluoroscopic X-ray image is designated by the input device as the first target imaging region, so that the first target imaging region is added to another fluoroscopic X-ray image of the trial radiographic X-ray image. The X-ray CT apparatus according to claim 1, further comprising: a target imaging region display unit that superimposes and displays an image. The data storage control unit simultaneously displays at least two fluoroscopic X-ray images including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A fluoroscopic X-ray image display unit;
A partial area of the first fluoroscopic X-ray image is designated by the input device as a first target imaging area, and a partial area of the second fluoroscopic X-ray image is further specified as a second target imaging area. When designated two-dimensionally by the input device, the target imaging area data representing the three-dimensional area corresponding to the second target imaging area is stored in the storage unit, and the first target imaging area and the second target imaging area are stored. A target imaging region moving unit that outputs a drive signal that automatically translates the X-ray source, the X-ray detector, and / or the table so that a region common to the target imaging region is captured by CT. The X-ray CT apparatus according to claim 1, wherein the X-ray CT apparatus is characterized. In the data storage control unit, a partial region of the fluoroscopic X-ray image associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is designated by the input device as a first target imaging region. Thus, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit, and at the same time the target imaging region data indicating the first target imaging region. A target imaging area data storage control unit to be stored in the storage unit;
The X-ray source, the X-ray detector, and the X-ray source, X-ray detection 2. A target imaging region update display unit that updates a first target imaging region in a fluoroscopic X-ray image that displays an image in conjunction with movement of a table or a table. Line CT device. In the data storage control unit, a partial region of the fluoroscopic X-ray image associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is designated by the input device as a first target imaging region. Thus, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit, and at the same time the target imaging region data indicating the first target imaging region. A first target imaging area data storage control unit to be stored in the storage unit;
A partial region of the fluoroscopic X-ray image that is taken from a different direction from the first fluoroscopic X-ray image and that is associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is a second purpose. When the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the second fluoroscopic X-ray image in the storage unit when the imaging region is specified two-dimensionally by the input device, A second target imaging region data storage control unit that stores in the storage unit target imaging region data representing a three-dimensional region corresponding to the second target imaging region;
Further, based on at least two fluoroscopic X-ray image data and at least two target imaging area data stored in the storage unit, a common area of the first target imaging area and the second target imaging area is CT. The X-ray source, the X-ray detector, and / or the target imaging area moving unit that outputs a driving signal for automatically translating the table so as to be photographed. Line CT device. An X-ray detector that captures a fluoroscopic X-ray image of a subject and an X-ray source that integrally irradiates fluoroscopic X-rays toward the center of the detection surface of the X-ray detector, and an X-ray detector An X-ray measurement optical system capable of rotating and moving on a rotation axis perpendicular to a line connecting the X-ray source and the X-ray source, and capable of changing the distance between the X-ray source and the X-ray detector ,
An X-ray measurement optical system drive mechanism that rotates and moves the X-ray measurement optical system based on the drive signal and changes the distance between the X-ray source and the X-ray detector;
A table disposed between the X-ray source and the X-ray detector and capable of translational and rotational movement with the subject placed thereon;
A table driving mechanism that rotates and translates the table based on the driving signal, and an input operation for generating the driving signal and the imaging signal, and an input for designating a target imaging area including a region of interest of the subject. An input device to be operated;
A display device for performing image display of a fluoroscopic X-ray image of the subject;
By capturing a fluoroscopic X-ray image of the subject, the X-ray source, X-ray detector, and table are associated with the current positional relationship of the X-ray source, the X-ray detector, and the table. A fluoroscopic X-ray image display storage control for storing fluoroscopic X-ray image data indicating a fluoroscopic X-ray image in which the positional relationship of the X-ray source, the X-ray detector, and the table is associated with each other by inputting a signal. And
By capturing a fluoroscopic X-ray image of the subject while rotating the table, a plurality of fluoroscopic X-ray image data in which the positional relationship among the X-ray source, the X-ray detector, and the table is associated is stored in the storage unit. A CT imaging execution unit for executing CT imaging;
An X-ray CT apparatus comprising a reconstruction calculation unit that reconstructs a tomographic image of a subject using a plurality of fluoroscopic X-ray image data stored by the CT imaging,
Before the CT imaging, using the at least two fluoroscopic X-ray image data stored by the fluoroscopic X-ray image display storage control unit, the first fluoroscopic X-ray image and the first fluoroscopic X-ray image of the subject And an image display of a trial radiographic X-ray image that is at least two fluoroscopic X-ray images including a second fluoroscopic X-ray image in a different direction, and a partial region of the first fluoroscopic X-ray image Is designated as the first target imaging area two-dimensionally by the input device, the target imaging area data representing the three-dimensional area corresponding to the first target imaging area is stored in the storage unit, and the trial is performed. An X-ray CT apparatus comprising a data storage control unit that associates a radiographic X-ray image with another fluoroscopic X-ray image. The data storage control unit simultaneously displays at least two fluoroscopic X-ray images including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A fluoroscopic X-ray image display unit;
A part of the first fluoroscopic X-ray image is designated by the input device as the first target imaging region, so that the first target imaging region is added to another fluoroscopic X-ray image of the trial radiographic X-ray image. An X-ray CT apparatus according to claim 6, further comprising a target imaging region display unit that superimposes and displays an image. The data storage control unit simultaneously displays at least two fluoroscopic X-ray images including the first fluoroscopic X-ray image and the second fluoroscopic X-ray image as the trial radiographic X-ray image. A fluoroscopic X-ray image display unit;
A partial area of the first fluoroscopic X-ray image is designated by the input device as a first target imaging area, and a partial area of the second fluoroscopic X-ray image is further specified as a second target imaging area. When two-dimensionally specified by the input device, the target imaging area data representing the three-dimensional area corresponding to the second target imaging area is stored in the storage unit, and the first target imaging area and the second target imaging area are stored. The X-ray measurement optical system is automatically rotated and the X-ray source, the X-ray detector and / or the table are automatically translated so that a common area with the target imaging area is captured by CT. The X-ray CT apparatus according to claim 6, further comprising a target imaging region moving unit that outputs a driving signal to be output. In the data storage control unit, a partial region of the fluoroscopic X-ray image associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is designated by the input device as a first target imaging region. Thus, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit, and at the same time the target imaging region data indicating the first target imaging region. A target imaging area data storage control unit to be stored in the storage unit;
The X-ray source, the X-ray detector, and the X-ray source, X-ray detection 7. A target imaging area update display unit for updating a first target imaging area in a fluoroscopic X-ray image for displaying an image in conjunction with movement of a table or a table. Line CT device. In the data storage control unit, a partial region of the fluoroscopic X-ray image associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is designated by the input device as a first target imaging region. Thus, the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the first fluoroscopic X-ray image in the storage unit, and at the same time the target imaging region data indicating the first target imaging region. A first target imaging area data storage control unit to be stored in the storage unit;
A partial region of the fluoroscopic X-ray image that is taken from a different direction from the first fluoroscopic X-ray image and that is associated with the current positional relationship of the X-ray source, the X-ray detector, and the table is a second purpose. When the fluoroscopic X-ray image display storage control unit stores the fluoroscopic X-ray image data indicating the second fluoroscopic X-ray image in the storage unit when the imaging region is specified two-dimensionally by the input device, A second target imaging region data storage control unit that stores in the storage unit target imaging region data representing a three-dimensional region corresponding to the second target imaging region;
Based on at least two fluoroscopic X-ray image data and at least two target imaging area data stored in the storage unit, a CT area is common to the first target imaging area and the second target imaging area. A target imaging area moving unit that outputs a drive signal for automatically rotating and moving the X-ray measuring optical system and automatically moving the X-ray source, the X-ray detector and / or the table. An X-ray CT apparatus according to claim 6, comprising:   The target imaging area moving unit automatically rotates and moves the X-ray measurement optical system so that a direction in which the X-ray source emits fluoroscopic X-rays is perpendicular to a rotation axis around which the table rotates. In the above, the X-ray source, the X-ray detector and / or the table are automatically translated so that the common area between the first target imaging area and the second target imaging area is CT-scanned. The X-ray CT apparatus according to claim 8 or 10, wherein: