JP5045134B2 - X-ray CT system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray CT apparatus capable of easily acquiring a tomographic image of a subject's target region of a subject. <P>SOLUTION: The X-ray CT apparatus 1 includes an X-ray measurement optical system 13, a table 14, an input device 22, a table activation mechanism 16, a reconstructive calculation part 35, a display device 23, and a perspective X-ray image development part 31 provided on the display device 23 to display a perspective X-ray image 26. A test photographing image display part 37 to display at least two tomographic images including a first tomographic image 24 of the subject developed by a reconstruction and a second tomographic image 24 whose direction is different from that of the first tomographic image 24 as test photographing images 24, and a predetermined region of the test photographing images 24 are designated by the input device 22 as a target region for CT imaging 27, which allow a target region for CT imaging display part 38 to superimpose the target region for CT imaging 27 on the perspective X-ray image 26 based on a positional relationship between an X-ray source 11, an X-ray detector 12, and the table 14. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to an industrial X-ray CT apparatus that captures an enlarged tomographic image of a part of an article, for example.

The X-ray CT apparatus can observe internal defects and internal structures that cannot be determined from the appearance by the tomographic image displayed on the display device. For example, the X-ray CT apparatus is used for internal inspection of electronic components and other industrial products. Yes.
The detection optical system of the X-ray CT apparatus includes an X-ray source and an X-ray detector disposed so as to face the X-ray source. As an X-ray detector, a combination of an image intensifier (hereinafter abbreviated as II) and a CCD camera is generally used. Recently, a flat panel X-ray detector is used instead of an X-ray detector combining II and a CCD camera. A rotating table is provided between the X-ray source and the X-ray detector for placing a subject and rotating the rotating object around a rotation axis orthogonal to the X-ray optical axis.

When performing CT imaging, fluoroscopic X-rays are emitted from an X-ray source so that a transmitted X-ray image of a subject is captured by an X-ray detector, and X Capture X-ray transmission data from the line detector. Then, a tomographic image of the subject is reconstructed using the acquired X-ray transmission data (see, for example, Patent Document 1). In the display device, three-dimensional image display by volume rendering or arbitrary cross-sectional image display (hereinafter also referred to as MPR (Multi Planer Reconstruction) display) is performed from three-dimensional data composed of a plurality of tomographic images.

  Incidentally, an X-ray CT apparatus is known that has an enlargement reconstruction function capable of displaying a tomographic image in which a partial area of a subject is enlarged. 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 X-ray transmission 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 inferior.

In view of this, a rotary table has been developed that translates with a table drive mechanism. There is known an X-ray CT apparatus that newly takes in appropriate X-ray transmission data by translating a subject placed on a rotary table by such a table driving mechanism. That is, by moving the rotary table, a fluoroscopic X-ray image obtained by enlarging a part of the subject is photographed, and an enlarged tomographic image is obtained by reconstructing the captured enlarged fluoroscopic X-ray image. At this time, the control of the table driving mechanism for moving the rotary table is executed by receiving a driving signal from the input device.
JP 2004-1117024 A

By the way, in the X-ray CT apparatus as described above, the adjustment for photographing a fluoroscopic X-ray image obtained by enlarging a partial area of the subject is performed by the fluoroscopic X-ray image of the subject displayed on the display device and the imaging field of view FOV. It is common to perform this while looking at numerical information (for example, the diameter and height of a cylindrical shape) of (Field of View) (the region of the rotating body around the rotation axis). Here, the adjustment of the imaging field of view will be described using a perspective X-ray image of the condenser as a specific example. FIG. 10 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. 11 is an enlarged fluoroscopic X-ray of a partial region of the condenser (subject). It is a figure which shows an example of an image. As shown in FIGS. 10 and 11, the fluoroscopic X-ray image of the condenser is created using the X-ray transmission data when the fluoroscopic X-ray passes through the condenser as it is. The image is displayed by overlapping the internal structure of the condenser in the transmitting region. Therefore, even if the adjustment for photographing a fluoroscopic X-ray image in which a partial area of the subject is enlarged while viewing the fluoroscopic X-ray image of the condenser as shown in FIG. 10 or FIG. It was difficult to intuitively grasp the area of the condenser to be CT-photographed (that is, the imaging field of view FOV at the time of enlargement).

Therefore, in the first adjustment, a tomographic image taken with a large FOV is acquired so that a fluoroscopic X-ray image of a capacitor in a relatively large region (preferably the entire region) including the target region can be obtained. The obtained test tomographic image is confirmed, and the position is adjusted while viewing the fluoroscopic X-ray image again. Then, until the (enlarged) tomographic image of the target region 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 to obtain a desired image, and the position is adjusted by imagining from the fluoroscopic X-ray image displayed by overlapping the internal structure, which makes it difficult to perform an intuitive operation. there were.

  Accordingly, the present invention provides an X-ray CT apparatus capable of adjusting the position of a table and thus the position of a subject while intuitively grasping the range of a tomographic image obtained when CT imaging of the subject is performed. With the goal.

An X-ray CT apparatus according to a first aspect of the present invention, which has been made to solve the above-described problems, irradiates a fluoroscopic X-ray toward the X-ray detector that captures a fluoroscopic X-ray image of a subject and the X-ray detector. An X-ray measuring optical system having an X-ray source, an X-ray that is disposed between the X-ray source and the X-ray detector and holds the subject, and is in the same direction as the X-ray optical axis; A table that is capable of translational movement in the z-direction, which is the same direction as the rotation axis perpendicular to the optical axis , and a table that can be rotated about the rotation axis, an input operation for creating a drive signal, and a purpose An input device that is input to specify a CT imaging region, a table drive mechanism that rotates and translates the table based on a drive signal, and a fluoroscopic X-ray image of the subject while the table is rotated. CT imaging execution unit for executing CT imaging And a transmission data storage unit for storing X-ray transmission data of the subject obtained by CT imaging, a reconstruction calculation unit for reconstructing a tomographic image of the subject using the X-ray transmission data, and image display X-ray X-ray image display on the display device based on the X-ray transmission data of the subject obtained from the current positional relationship between the display device and the X-ray source, X-ray detector and table. an X-ray CT apparatus and an image creation unit, created by the reconstruction, the longitudinal tomographic image of an object that is perpendicular to the horizontal tomographic image and the xy plane of the object is parallel to the xy plane perpendicular to the z-direction A test shot image display unit that displays an image of at least two tomographic images including a test shot image, and a predetermined region in the test shot image is designated as a target CT imaging region by the input device, whereby the X line , Based on the positional relationship between the X-ray detector and the table, and superimposes the purpose CT imaging area fluoroscopic X-ray image to and a purpose CT imaging area display unit for displaying an image.

Here, the “trial image” refers to an image that is displayed in advance in order to confirm the positional relationship between the subject and the X-ray measurement optical system at the current position (before position adjustment). An image used for designating a target CT imageable region in the subject when the position of the subject and the X-ray measurement optical system is adjusted so that an enlarged tomographic image of a partial region of the subject can be acquired.
Further, the first tomographic image and the second tomographic image displayed on the screen as the trial image may be selected from two different planes, but are preferably two planes orthogonal to each other. For example, a combination of two planes of a horizontal tomographic image in a horizontal direction and a vertical (vertical) tomographic image in a direction parallel to the rotation axis may be displayed.

According to the X-ray CT apparatus of the first aspect of the present invention, first, the table is moved so that a fluoroscopic X-ray image of the entire area of the subject is obtained (however, it is not necessarily the entire area, and the fluoroscopic X for the entire subject is not necessarily required). It is sufficient that the line image position can be clearly grasped), and at least two different tomographic images are displayed on the display device by performing CT imaging of the subject and reconstructing based on the obtained X-ray transmission data. Is displayed as a trial shot image. Next, a predetermined region in the tomographic image of the subject is designated as a target CT imaging region having a cylindrical shape using the input device. At this time, using the current positional relationship among the X-ray source, the X-ray detector, and the table, the target CT imaging region is superimposed on the fluoroscopic X-ray image and image display is performed. Thereafter, each time the table is moved, the target CT imageable area is recalculated, and the target CT imageable area after the table movement is superimposed and displayed on the fluoroscopic X-ray image. As a result, the operator confirms in advance a fluoroscopic X-ray image on which the target CT imaging region is superimposed before performing CT imaging for obtaining the next enlarged tomographic image, while grasping intuitively. Determine the position of the table.

According to the X-ray CT apparatus of the first aspect of the present invention, a horizontal tomogram obtained when CT imaging is performed with the current table position and the positional relationship of the X-ray measurement optical system before performing CT imaging. The range of the vertical (longitudinal) tomographic image or the like can be confirmed in advance on a fluoroscopic X-ray image on which the target CT imaging region is superimposed, so CT imaging for obtaining an enlarged tomographic image of a three-dimensional object In this case, the position setting operation can be performed while intuitively confirming with the fluoroscopic X-ray image.

(Means and effects for solving other problems)
The X-ray CT apparatus of the second aspect of the present invention 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. The X-ray measuring optical system, an X-ray source, and an X-ray detector are disposed between the X-direction and the X-ray optical axis in the same direction as the X-ray optical axis while holding the subject. A table that can be translated in the z direction, which is the same direction as the rotation axis , and a table that can be rotated around the rotation axis, an input operation for creating a drive signal, and a target CT imaging area are designated. CT imaging is performed by capturing an X-ray image of a subject while rotating the table and a table driving mechanism that rotates and translates the table based on a driving signal. CT imaging execution unit and CT imaging A transmission data storage unit that stores the obtained X-ray transmission data of the subject, a reconstruction calculation unit that reconstructs a tomographic image of the subject using the X-ray transmission data, a display device that performs image display, A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; an X-ray CT apparatus comprising, created by the reconstruction, at least two surfaces and a longitudinal tomographic image of an object that is perpendicular to the horizontal tomographic image and the xy plane of the object is parallel to the xy plane perpendicular to the z-direction A tomographic image display unit that displays an image as a tomographic image, and a predetermined region in the test tomographic image is designated as a target CT imaging region by an input device, so that the target CT imaging region is CT As shadows, so that and an object CT imaging region movement section that outputs a drive signal for translating movement of said table.

According to the X-ray CT apparatus of the second aspect 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, CT imaging of the subject is executed, and the obtained X-ray transmission is obtained. By reconstructing based on the data, at least two different tomographic images are displayed on the display device as trial shot images. Next, a predetermined region in the tomographic image of the subject is designated as a target CT imaging region having a cylindrical shape using the input device. As a result, the tomographic image of the target region of the subject can be easily obtained by the target CT imaging region moving unit appropriately moving the subject automatically using the positional relationship of the X-ray source, the X-ray detector, and the stage. it can.

The X-ray CT apparatus of the third aspect of the present invention 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. The X-ray measuring optical system, an X-ray source, and an X-ray detector are disposed between the X-direction and the X-ray optical axis in the same direction as the X-ray optical axis while holding the subject. A table that can be translated in the z direction, which is the same direction as the rotation axis , and a table that can be rotated around the rotation axis, an input operation for creating a drive signal, and a target CT imaging area are designated. CT imaging is performed by capturing an X-ray image of a subject while rotating the table and a table driving mechanism that rotates and translates the table based on a driving signal. CT imaging execution unit and CT imaging A transmission data storage unit that stores the obtained X-ray transmission data of the subject, a reconstruction calculation unit that reconstructs a tomographic image of the subject using the X-ray transmission data, a display device that performs image display, A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising: a camera for copying an appearance image associated with a fluoroscopic X-ray image captured by an X-ray measuring optical system from at least two different directions; is performed and horizontal appearance image of the subject is parallel to the xy plane perpendicular to the z-direction, the image displayed as a test shot image appearance image of at least two surfaces and a side surface appearance image of the subject which is perpendicular to the xy plane A predetermined region in the test shot image display unit and the test shot image is designated as a target CT imaging region by the input device, and based on the positional relationship between the X-ray source, the X-ray detector, and the table, A target CT imaging region display unit that displays an image by superimposing the target CT imaging region on the fluoroscopic X-ray image is provided.

Here, the camera may be any camera that can display the appearance image of the subject on the screen of the display device. For example, a video camera, a digital camera, or the like can be used.
The number of cameras for photographing from at least two directions may be one or two or more. When there is one camera, in order to obtain an appearance image from two directions, the table on which the subject is placed may be rotated and photographed from two directions. When there are two cameras, they may be arranged in different directions, for example, one may be arranged on the ceiling portion above the table, and one may be arranged on the side of the table. When there are three cameras, for example, they may be arranged in three orthogonal directions, one for the ceiling above the table and the other two for orthogonal to the side of the table. By using more cameras, it is possible to observe the subject from various directions at the same time, and it is easy to grasp the position three-dimensionally.

  In addition, the first appearance image and the second appearance image displayed on the screen as trial shot images may be at least two different appearance images, but are preferably two surfaces orthogonal to each other. For example, a combination of two surfaces of a horizontal image (photographed from a camera attached to the ceiling) and a vertical image (photographed from a camera attached to the side of the table) in a direction parallel to the rotation axis may be displayed. .

According to the X-ray CT apparatus of the third aspect of the present invention, first, the table is moved so that the appearance image of the entire area of the subject is captured. As long as it is an area that can be grasped), the appearance image of the subject is taken from two directions, and the obtained appearance image is displayed on the display device as a trial shot image. Next, a predetermined area in the appearance image of the subject is designated as a target CT imaging area having a cylindrical shape by using the input device. At this time, the displayed appearance image is associated with the positional relationship with the fluoroscopic X-ray image photographed by the X-ray measurement optical system, and therefore, the position of the X-ray source, the X-ray detector, and the table Based on the relationship, the target CT imaging region is superimposed on the fluoroscopic X-ray image and image display is performed. Thereafter, each time the table is moved, the target CT imageable area is recalculated, and the target CT imageable area after the table movement is superimposed and displayed on the fluoroscopic X-ray image. As a result, the operator confirms in advance a fluoroscopic X-ray image on which the target CT imaging region is superimposed before performing CT imaging for obtaining the next enlarged tomographic image, while grasping intuitively. Determine the position of the table.
Therefore, according to the X-ray CT apparatus of the third aspect of the present invention, before performing CT imaging, the horizontal level obtained when CT imaging is performed with the current table position and the positional relationship of the X-ray measurement optical system. The range of the tomographic image, the vertical (longitudinal) tomographic image, and the like can be confirmed in advance on a fluoroscopic X-ray image on which the target CT imaging region is superimposed, so that an enlarged tomographic image of a three-dimensional object can be obtained. When performing CT imaging, the position setting operation can be advanced while intuitively checking with a fluoroscopic X-ray image.

The X-ray CT apparatus of the fourth aspect of the present invention 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. The X-ray measuring optical system, an X-ray source, and an X-ray detector are disposed between the X-direction and the X-ray optical axis in the same direction as the X-ray optical axis while holding the subject. A table that can be translated in the z direction, which is the same direction as the rotation axis , and a table that can be rotated around the rotation axis, an input operation for creating a drive signal, and a target CT imaging area are designated. CT imaging is performed by capturing an X-ray image of a subject while rotating the table and a table driving mechanism that rotates and translates the table based on a driving signal. CT imaging execution unit and CT imaging A transmission data storage unit that stores the obtained X-ray transmission data of the subject, a reconstruction calculation unit that reconstructs a tomographic image of the subject using the X-ray transmission data, a display device that performs image display, A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising: a camera for copying an appearance image associated with a fluoroscopic X-ray image captured by an X-ray measuring optical system from at least two different directions; is performed and horizontal appearance image of the subject is parallel to the xy plane perpendicular to the z-direction, the image displayed as a test shot image appearance image of at least two surfaces and a side surface appearance image of the subject which is perpendicular to the xy plane A table shot image display unit and a predetermined area in the trial shot image are designated as a target CT imaging area by an input device, so that the table is translated so that the target CT imaging area is CT shot. And a target CT imaging region moving unit that outputs a drive signal.

According to the X-ray CT apparatus of the fourth aspect of the present invention, first, the table is moved so that the appearance image of the entire area of the subject is captured, the appearance image of the subject is photographed from two directions, and the obtained appearance image is obtained. Then, it is displayed as a trial shot image on the display device. Next, a predetermined area in the appearance image of the subject is designated as a target CT imaging area having a cylindrical shape by using the input device. At this time, the displayed appearance image is associated with the positional relationship with the fluoroscopic X-ray image photographed by the X-ray measurement optical system, and therefore, the position of the X-ray source, the X-ray detector, and the table Based on the relationship, the tomographic image of the target region of the subject can be easily obtained by the target CT imaging region moving unit appropriately moving the subject automatically.

In the above invention, the target CT imaging region display unit calculates the target CT imaging possible region in conjunction with the translation of the table, and updates the target CT imaging possible region displayed superimposed on the fluoroscopic X-ray image. You may do it.
According to this, when the table is moved, the target CT imageable area changes in conjunction with it, so that the imaging range of the tomographic image can be intuitively grasped, and the operation direction of the table movement for obtaining a desired image can be determined. It can be grasped intuitively.

Furthermore, in the above invention, the test photograph image display unit is an object parallel to an xy plane perpendicular to the z direction, which is created by reconstruction after performing CT imaging after the target CT imaging region is designated. At least two tomographic images including the horizontal tomographic image and the vertical tomographic image of the subject perpendicular to the xy plane may be displayed as a new trial image .

  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 driving mechanism 16, and an X-ray detector driving 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 detector 12 are located at the origin position (the X-ray source and the X-ray detector are directly facing each other by the table driving mechanism 16 and the X-ray detector driving mechanism 15. In order to set and calculate the amount and direction of movement, the three orthogonal directions (x direction, y direction, and z direction) are set as shown in FIG. 1a. It has established. That is, the direction perpendicular to the surface on which the subject of the table 14 is placed (upper plate member 14a described later) is defined as the z direction. Further, when adjusting the magnification of the subject, the distance SOD (Source to Object Distance) between the X-ray source 11 and the subject (more precisely, the distance SOD between the X-ray source 11 and the axis that rotates the subject) is adjusted. Or the distance SID (Source to Image Distance) between the X-ray source 11 and the X-ray detector 12 is adjusted. At this time, the direction in which the table 14 and the X-ray detector 12 are moved is determined as the x direction. Yes. Furthermore, the direction orthogonal to the x direction and the z direction is defined as the y direction. Therefore, the surface (horizontal plane) on which the subject is placed is the xy plane.

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 detector 12 is 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 in the x direction described above. A source 11 and an X-ray detector 12 are arranged.

  As the X-ray detector 12, a combination of II and a CCD camera is used. II detects a fluoroscopic X-ray to form a fluoroscopic image. When the fluoroscopic image is taken by the CCD camera, a fluoroscopic X-ray video signal is output to the computer 20.

The X-ray detector 12 is formed to be capable of translational movement in the y direction as well as translational movement in the x direction. 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 in the x direction (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.
Further, by moving the X-ray detector 12 in the y direction, an “offset scan” in which the center of rotation is moved toward the end of the detector and imaging can be performed (referred to as II-y axis adjustment).

  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 measurement object is placed on the upper plate-like body 14a made of 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.
The distance SOD between the X-ray source 11 and the measurement object can be adjusted by moving the lower member 14b of the table 14 in the x direction (referred to as SOD axis adjustment). When the SOD is decreased by adjusting the SOD axis, the enlargement ratio is increased. On the other hand, when the SOD is increased, the enlargement ratio is decreased.
In addition, the height of the imaging portion can be adjusted by moving the lower member 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 the measurement object placed on the upper plate-like body 14a can be measured. , And can be rotated around this axis. At the time of CT imaging, fluoroscopic X-ray 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 and y directions on the middle plate 14c. By moving the upper plate 14a in the x direction and the y direction with respect to the rotation center (θ axis), the portion of the measurement object placed on the upper plate 14a to be imaged is 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 detector drive mechanism 15 includes a drive motor for moving the X-ray detector 12. Note that the control of the X-ray detector 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 25 for storing X-ray transmission data, position data, and the like, a display device 23 having a monitor screen 23 a and the like, and a keyboard 22 a and a mouse 22 b (and a keyboard) as input devices. And are connected.
Further, the functions processed by the CPU 21 will be described in the form of blocks. A fluoroscopic X-ray image creation unit 31, a CT imaging execution unit 34, a reconstruction calculation unit 35, a drive signal generation unit 36, and a test shot image display unit 37 will be described. And a target CT imaging region display unit 38. The memory 25 includes a transmission data storage area (transmission data storage unit) 41 that stores X-ray transmission data, a position data storage area 42, and a tomographic image data storage area 43.

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. The current position (xt, A, zt) and rotation angle (θt) of the body 14c, the current position (θx, θy, zt + B) in the coordinate system on the upper plate 14a, and the current position of the X-ray detector 12 The position data of (xi, yi, C) is stored. Furthermore, the position of the X-ray source 11 and the relationship between the size and position of the shape of the target CT imaging region 27 are also stored. A, B, and C are preset constants.
The “target CT imaging area” is stored as a cylinder. Thus, for example, FIG. 2A is a plan view showing the positional relationship among the X-ray detector 12, the X-ray source 11, and the table 14 that are designated as an example of the target CT imaging region 27. 2 (b) is a side view shown in FIG. 2 (a). FIG. 3A is a plan view showing the positional relationship among the X-ray detector 12, the X-ray source 11, and the table 14 to be specified in another example of the target CT imaging region 27. FIG. FIG. 3B is a side view shown in FIG.

  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 detector drive mechanism 15. Control for storing the positions of the body 14c, the upper plate 14a and the X-ray detector 12 is performed. That is, the drive signal generator 36 moves the table 14 or the X-ray detector 12 by receiving an input operation using the keyboard 22a or the mouse 22b or a CT imaging signal described later. In addition, the drive signal generator 36 is configured such that the current position (xt, A, zt) and rotation angle (θt) of the middle plate-like body 14c, and the current position (θx, θy, zt + B) and the position data of the current position (xi, yi, C) of the X-ray detector 12 are stored.

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 outputs a CT imaging signal to a later-described fluoroscopic X-ray image creation unit 31 and performs control for sequentially imaging fluoroscopic X-ray images of the subject at each preset minute rotation angle (Δθ). Is what you do.

The fluoroscopic X-ray image creation unit 31 performs control to display the fluoroscopic X-ray image 26 on the monitor screen 23a based on the X-ray transmission data converted from the video signal output from the X-ray detector 12. It is. Further, during CT imaging, control for storing X-ray transmission data in the transmission data storage area 41 is performed. At this time, the X-ray transmission data includes the current position (xt, A, zt) and the rotation angle (θt) of the middle plate 14c, and the current position (θx, θy, zt + B) and the position data of the current position (xi, yi, C) of the X-ray detector 12 are stored in the transmission data storage area 41.

The reconstruction calculation unit 35 uses the X-ray transmission data stored in the transmission data storage area 41 to reconstruct a tomographic image of the subject and performs control to store the tomographic image data in the tomographic image data storage area 43. Is. By designating a cross section to be displayed by an input operation for a test image to be described later, a corresponding tomographic image is reconstructed.

The test shot image display unit 37 performs control to display the first tomographic image 24a, the second tomographic image 24b, and the third tomographic image 24c of the subject on the monitor screen 23a. For example, as shown in FIG. 5, a first tomographic image (horizontal tomographic image) 24a of a subject parallel to the xy plane, a second tomographic image (vertical tomographic image) 24b of a subject perpendicular to the xy plane, and xy An image is displayed with a third tomographic image (second longitudinal tomographic image) 24c of the subject perpendicular to the plane and the second tomographic image 24b. In this way, it is preferable to display three tomographic images that are orthogonal to each other, but three tomographic images that are not orthogonal to each other may be displayed. Further, instead of three tomographic images, two tomographic images or four or more tomographic image displays may be displayed.

At this time, in the first tomographic image 24a, the second tomographic image 24b, and the third tomographic image 24c, a mark indicating the position of each tomographic image is also displayed so that the positional relationship can be understood. Specifically, in the first tomographic image 24a, the straight mark indicating the position of the second tomographic image 24b is displayed so as to extend from the upper left to the lower right, and the linear mark indicating the position of the third tomographic image 24c. Is displayed so as to extend from the upper right to the lower left. In the second tomographic image 24b, a straight line mark indicating the position of the first tomographic image 24a is displayed so as to extend from top to bottom. Further, in the third tomographic image 24c, a straight line mark indicating the position of the first tomographic image 24a is displayed so as to extend from left to right. When the positions of these straight marks are redesignated by an input operation, a cross-sectional image at the designated position is created by the reconstruction calculator 35, and a tomographic image is newly displayed on the screen.

The target CT imaging area display unit 38 specifies the tomographic image data in the tomographic image data storage area 43 and the position data in the position data storage area 42 by designating a predetermined area in the trial image 24 as the target CT imaging area 27. The target CT imaging region 27 is superposed on the fluoroscopic X-ray image 26 to perform control for displaying an image. When the table 14 or the X-ray detector 12 is moved, an image display is performed by superimposing the current target CT imaging region 27 on the fluoroscopic X-ray image 26 based on the tomographic image data and the position data every time the table 14 or the X-ray detector 12 is moved. become.

For example, as shown in FIG. 4, a circle (shown by a broken line) indicating the target CT imaging region 27 is displayed on the first tomographic image 24a, and the target CT imaging region 27 is shown on the second tomographic image 24b. A quadrangle (shown by a broken line) is displayed as an image, and a quadrangle (shown by a broken line) indicating the target CT imaging region 27 is displayed as an image on the third tomographic image 24c. As a result, using the positional relationship between the table 14 and the target CT imaging area 27, the target CT imaging area 27 is superimposed on the fluoroscopic X-ray image 26 and image display is performed. Therefore, a tomographic image of the target area of the subject can be easily obtained by appropriately moving the subject with reference to the fluoroscopic X-ray image 26 on which the target CT imaging area 27 is superimposed.

Next, a procedure for obtaining an enlarged tomographic image of a subject using the X-ray CT apparatus 1 will be described. FIG. 6 is a flowchart for explaining an example of a method for obtaining an enlarged tomographic image by the X-ray CT apparatus 1.
First, in step S101, a subject is placed on the table 14.

Next, in the process of step S102, the fluoroscopic X-ray image creation unit 31 displays an image of the fluoroscopic X-ray image 26 on the monitor screen 23a based on the X-ray transmission data.
Next, in the processing of step S103, the table 14 or the X-rays so that a fluoroscopic X-ray image 26 of the entire region of the subject is obtained by an input operation of moving the table 14 or the X-ray detector 12 using the keyboard 22a or the mouse 22b. The detector 12 is moved to adjust xt, zt, θx, θy, xi, yi (that is, SOD axis, z axis, θx axis / θy axis, SID axis, II-y axis). For example, the table 14 and / or the X-ray detector 12 are moved so as to obtain a fluoroscopic X-ray image 26 in which the entire image of the subject in the front direction as shown on the left side of FIG. At this time, only the fluoroscopic X-ray image 26 is displayed on the monitor screen 23a (that is, the right tomographic image in FIG. 5 is not obtained).

Next, in the processing of step S104, the CT imaging execution unit 34 rotationally moves the central plate-like body 14c about each rotation angle (Δθ) around the rotation axis (θ axis) by an input operation using the operation panel 22a ( The CT imaging signal is output to the drive signal generation unit 36 and the fluoroscopic X-ray image creation unit 31 so that the fluoroscopic X-ray images of the subject are sequentially captured. 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. The fluoroscopic X-ray image creating unit 31 captures a fluoroscopic X-ray image and stores it in the transparent data storage area 41 every time the table driving mechanism 16 rotates the microscopic angle.

Next, in the processing of step S105, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject using the X-ray transmission data stored in the transmission data storage area 41, and reconstructed tomographic image data. Is stored in the tomographic image data storage area 43.
Next, in the process of step S106, the test photograph image display unit 37 displays the first tomographic image 24a, the second tomographic image 24b, and the third tomographic image 24c of the subject as the test photograph images 24 on the monitor screen 23a. Do. For example, as shown in FIG. 5, a first tomographic image (horizontal tomographic image) 24a of a subject parallel to the xy plane, a second tomographic image (vertical tomographic image) 24b of a subject perpendicular to the xy plane, and xy An image is displayed with a third tomographic image (vertical tomographic image) 24c of the subject perpendicular to the plane and the second tomographic image 24b. At this time, the image display of the target CT imaging region 27 is not performed on the first tomographic image 24a, the second tomographic image 24b, and the third tomographic image 24c.

Next, in the processing of step S107, a predetermined area in the trial shot image 24 is designated as the target CT imaging area 27 by an input operation using the keyboard 22a or the mouse 22b.
Next, in the process of step S108, the target CT imaging area display unit 38 designates a predetermined area in the trial image 24 as the target CT imaging area 27, so that the tomographic image data in the tomographic image data storage area 43 is obtained. Based on the position data in the position data storage area 42, the target CT imaging area 27 is superimposed on the fluoroscopic X-ray image 26 to display an image. For example, as shown in FIG. 4, in the first tomographic image 24a (horizontal tomographic image), a circle (indicated by a broken line) indicating the target CT imaging region 27 is displayed as an image, and the second tomographic image 24b (vertical tomographic image). In the image, a quadrangle (indicated by a broken line) indicating the target CT imaging region 27 is displayed as an image, and a quadrangle (indicated by a broken line) indicating the target CT imaging region 27 is displayed in the third tomographic image 24c (second vertical tomographic image). When the image is displayed, a square (shown by a broken line) indicating the target CT imaging region 27 is displayed on the fluoroscopic X-ray image 26 as an image.

Next, in step S109, an input operation is performed to move the table 14 or the X-ray detector 12 so that a tomographic image of the target area of the subject is obtained, and xt, zt, θx, θy, xi, yi Adjustment (adjustment of SOD axis, z axis, θx axis / θy axis, SID axis, II-y axis) is performed.
At this time, since the target CT imaging region is superimposed on the fluoroscopic X-ray image 26 and displayed as an image, the subject can be moved appropriately. In this way, the target CT imageable region 27 is superimposed on the fluoroscopic X-ray image 26 and displayed as an image. Therefore, depending on the positional relationship among the X-ray source 11, the X-ray detector 12 and the table 14 at the present time, Whether or not a tomographic image of the target area can be obtained can be intuitively grasped.

  Next, in the process of step S110, if the alignment between the target area and the target CT imageable area 27 is successful, the CT imaging execution unit 34 performs the CT imaging again with the center plate about the rotation axis by an input operation for performing CT imaging again. The CT 14c is output to the drive signal generator 36 so that the X-ray image of the subject is sequentially photographed by rotating the state body 14c at every minute rotation angle (Δθ). 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. The fluoroscopic X-ray image creation unit 31 captures a fluoroscopic X-ray image every time it is rotated by a small angle by the table driving mechanism 16 and accumulates it in each transmission data storage area 41.

Next, in the process of step S111, the reconstruction calculation unit 35 reconstructs a tomographic image of the subject using the X-ray transmission data stored in the transmission data storage area 41, and converts the tomographic image data into the tomographic image data. The data is stored in the storage area 43.
Next, in the process of step S112, the trial shot image display unit 37 displays the newly stored enlarged tomographic image on the monitor screen 23a. This enlarged tomographic image is a desired tomographic image that captures the target area. However, when the desired enlarged tomographic image is not obtained as a result, the processing from step S106 to step S112 is repeated as a trial image.
When the process of step S112 is completed, this flowchart is ended.

As described above, according to the X-ray CT apparatus 1, a horizontal tomographic image obtained when CT imaging is performed with the current table position and the positional relationship of the X-ray measurement optical system before performing CT imaging. The range of the vertical (longitudinal) tomographic image or the like can be confirmed in advance on a fluoroscopic X-ray image on which the target CT imaging region is superimposed, so CT imaging for obtaining an enlarged tomographic image of a three-dimensional object In this case, the position setting operation can be performed while intuitively confirming with the fluoroscopic X-ray image.
That is, an input operation for moving the table 14 or the X-ray detector 12 is performed, and a plurality of adjustments such as xt, zt, θx, θy, xi, yi (SOD axis, z axis, θx axis / θy axis, SID axis, SID axis, II-y-axis adjustment) can be executed, but the position of the subject can be adjusted while intuitively grasping the range of the tomographic image obtained when CT imaging of the subject is always performed.

(Embodiment 2)
FIG. 7a is a block diagram showing a configuration of another X-ray CT apparatus according to the present invention, and FIG. 7b is a detailed view of a range B shown in FIG. 7a. In the present embodiment, unlike the X-ray CT apparatus 1 described above, the X-ray CT apparatus 2 displays appearance images from three directions as test shot images in a function processed by the CPU 21, and a target CT imaging region display unit 38 is changed to the target CT imaging region moving unit 39, and the function of the drive signal generating unit 36 is changed. In addition, about the thing similar to the X-ray CT apparatus 1, while attaching | subjecting the same code | symbol, the description is abbreviate | omitted.

The X-ray CT apparatus 2 has a camera 51 attached above the table 14 and a camera 52 attached to the side of the table 14 with respect to the X-ray CT apparatus 1. The camera 51 and the camera 52 have a positional relationship with the X-ray measurement optical system 13 in advance, and as a result, the positional relationship between the appearance image captured by the cameras 51 and 52 and the fluoroscopic X-ray image can be easily associated. I can do it.

The CPU 21 of the computer 20 is provided with a camera image creation unit 53.
The camera image creation unit 53 performs, for example, a first appearance image 54a (planar view image), a second appearance image 54b (side view image) of the subject as shown in FIG. The third appearance image 54c (side view image in a direction orthogonal to the first appearance image and the second appearance image) is controlled to be captured.
Specifically, first the first appearance image 54a is copied by the camera 51, and then a drive signal is generated from the drive signal generator 36 to rotate the middle plate-like body 14c, from the x direction (X-ray optical axis direction). The direction of the middle plate-like body 14c is adjusted so that the appearance when viewed is seen, and the second appearance image 54b is copied by the camera 52, and further, the drive signal is generated to rotate the middle plate-like body 14c. The direction of the middle plate-like body 14 c is adjusted so that the appearance when viewed is seen, and the third appearance image 54 c is copied by the camera 52. After photographing, the table 14 is returned to the state when the first appearance image 54a is taken. Then, the appearance image data of the three images taken is stored in the appearance image data storage area 44.

Then, the trial image display unit 37 arranges the first appearance image data, the second appearance image data, and the third appearance image data stored in the appearance image data storage area 44 as a test image on the monitor screen 23a. Control the display.
FIG. 8 is a diagram showing a state in which these three appearance image data are displayed side by side. A first appearance image 54a (horizontal appearance image) of a subject parallel to the xy plane, a second appearance image 54b (appearance image viewed from the x direction) of the subject perpendicular to the xy plane, an xy plane, and a second appearance An image is displayed with a third appearance image 54c (an appearance image viewed from the y direction) of the subject perpendicular to the image 54b.
As described above, the trial shot image display unit 37 displays an appearance image on the monitor screen 23a as a trial shot image. First, the trial shot image is displayed as an appearance image, and a CT for a desired range is displayed. After acquiring the tomographic image by photographing, the (enlarged) tomographic image is displayed on the monitor screen 23a as a trial photographed image instead of the appearance image. Thereafter, the displayed (enlarged) tomographic image is used as a trial image. However, when it is desired to continue to display the appearance image as a trial image, it may be so.

In addition to the above-described functions, the drive signal generator 36 performs control to move the table 14 in parallel by receiving an automation signal described later.

The target CT imaging area moving unit 39 designates a predetermined area in the test photograph image 24 as the target CT imaging area, thereby converting the appearance image data in the appearance image data storage area 44 and the position data in the position data storage area 42. Based on this, control is performed to output an automation signal for moving the table 14 and / or the X-ray detector 12 so that the target CT imaging region is CT-scanned.
For example, by various operations of the keyboard 22a and the mouse 22b, a circle indicating the target CT imaging area is displayed on the first appearance image 54a, and a square indicating the target CT imaging area is displayed on the second appearance image 54b. In the third appearance image 54c, a quadrangle indicating the target CT imaging area is displayed as an image. As a result, using the positional relationship between the stage 14 and the X-ray detector 12 and the target CT imaging region, an automation signal is output to the drive signal generator 36 so that the target CT imaging region is CT-imaged. Therefore, by appropriately moving the subject, a tomographic image of the target area of the subject can be easily obtained.

Next, a procedure for obtaining an enlarged tomographic image of a subject using the X-ray CT apparatus 2 will be described. FIG. 9 is a flowchart for explaining an example of a method for obtaining an enlarged tomographic image by the X-ray CT apparatus 2.
In addition, since the process of step S201-203 is 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 S204, by performing an input operation for capturing an appearance image, the camera image creation unit 53 and the drive signal generation unit 36 move the table 14 to capture images in three directions.
Next, each appearance image is accumulated in the appearance data storage area 44 in the process of step S205.
Next, in the process of step S206, the test shot image display unit 37 displays the first appearance image 54a (horizontal appearance image), the second appearance image 54b (appearance image viewed from the x direction) of the subject and the first image on the monitor screen 23a. The three appearance images 54c (appearance images viewed from the y direction) are displayed (see FIG. 8).
At this time, no image display of the target CT imaging region is performed on the first tomographic image 54a, the second tomographic image 54b, and the third tomographic image 54c.

Next, in the process of step S207, a predetermined area in the trial image 54 is designated as a target CT imaging area by an input operation using the keyboard 22a or the mouse 22b.
Next, in the processing of step S208, the target CT imaging region moving unit 39 designates a predetermined region in the test photograph image 24 as the target CT imaging region, so that the X-ray source 11, the X-ray detector 12, and Using the positional relationship of the table 14, an automation signal for moving the table 14 is output so that the target CT imaging region is subjected to CT imaging. Then, the drive signal generator 36 that has received the automation signal outputs a drive signal for moving the table 14 to the table drive mechanism 16.

Next, in the process of step S209, after the table 14 is moved, the CT imaging execution unit 34 rotates the middle plate-like body 14c around the rotation axis for each minute rotation angle so that fluoroscopic X-ray images of the subject are sequentially obtained. The CT imaging signal is output to the drive signal generation unit 36 and the fluoroscopic X-ray image creation unit 31 so that the imaging is performed. The drive signal generator 36 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 16. The fluoroscopic X-ray image creation unit 31 captures a fluoroscopic X-ray image every time it is rotated by a small angle by the table driving mechanism 16 and accumulates it in each transmission data storage area 41.
Next, in the process of step S210, the test shot image display unit 37 displays the stored enlarged tomographic image on the monitor screen 23a. This enlarged tomographic image is a desired tomographic image that captures the target area. As a result, when the desired enlarged tomographic image is not copied, the processing in steps S206 to S211 is repeated as a trial image. It will be.
Then, when a desired tomographic image is obtained in the process of step S211, this flowchart is ended.

As described above, according to the X-ray CT apparatus 2, first, the table 14 is moved so that the appearance image of the entire region of the subject is captured, and the appearance image of the subject is photographed from three directions, and the obtained appearance image is obtained. Is displayed as a test shot image 54 on the monitor screen 23a. Next, a predetermined area in the appearance image 54 of the subject is designated as a target CT imaging area having a cylindrical shape by using the input device 22. At this time, the displayed appearance image 54 is associated with a positional relationship with a fluoroscopic X-ray image photographed by the X-ray measurement optical system 13, and thus, the X-ray source 11 and the X-ray detector 12. Based on the positional relationship of the table 14, the target CT imaging region moving unit 39 automatically moves the subject appropriately, so that a tomographic image of the target region of the subject can be easily obtained.

  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 block diagram which shows the structure of the X-ray CT apparatus which is one Embodiment of this invention. It is a figure which shows the positional relationship of the X-ray detector, X-ray source, and table which will be designated by an example of the target CT imaging area. It is a figure which shows the positional relationship of the X-ray detector, X-ray source, and table which will be designated by the other example of the target CT imaging region. It is a figure which shows an example of the fluoroscopic X-ray image displayed on the screen of a display apparatus, and a test photograph image (three-way tomographic image). It is a figure which shows an example of the fluoroscopic X-ray image and the test image (3 direction tomographic image) which were projected on the screen of a display apparatus (image before target CT imaging region superimposition display). 2 is a flowchart for explaining an example of a method for obtaining 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. It is a block diagram which shows the structure of the X-ray CT apparatus which is other one Embodiment of this invention. It is a figure (three direction external appearance image) which shows another example of a test shot image. It is a flowchart for demonstrating an example of the method of obtaining the expansion tomogram 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.

Explanation of symbols

1: X-ray CT apparatus 11: X-ray source 12: X-ray detector 13: X-ray measurement optical system 14: Table 16: Table drive mechanism 20: Control system (computer)
21: CPU
22: Input device 23: Display device 24: Trial taken image 25: Memory 26: Perspective X-ray image 27: Target CT imaging region 31: Perspective X-ray image creation unit 35: Reconstruction calculation unit 37: Trial taken image display unit 38 : Target CT imaging region display unit 39: Target CT imaging region moving unit 41: Transmission data storage unit

Claims (6)

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;
In the state of being held between the X-ray source and the X-ray detector and holding the subject , the x-direction is the same direction as the X-ray optical axis, and the rotation axis is the same direction as the direction orthogonal to the X-ray optical axis. A table capable of translational movement in a certain z direction and rotational movement about a rotation axis;
An input device that is input to create a drive signal and that is input to specify a target CT imaging area;
A table drive mechanism for rotating and translating the table based on the drive signal;
A CT imaging execution unit that performs CT imaging by imaging a fluoroscopic X-ray image of a subject while rotating the table;
A transmission data storage unit for storing X-ray transmission data of a subject obtained by CT imaging;
A reconstruction calculation unit for reconstructing a tomographic image of a subject using the X-ray transmission data;
A display device for displaying images;
A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising:
Created by the reconstruction, z-direction in the image as at least two surfaces of the test tomographic images taken image and a vertical and a longitudinal tomographic image of a subject on the horizontal sectional image and the xy plane of the object is parallel to the xy plane perpendicular A test shot image display unit for displaying,
A predetermined region in the test photograph image is designated as a target CT imaging region by the input device, so that the target CT imaging region is fluoroscopically X-rayed based on the positional relationship of the X-ray source, the X-ray detector, and the table. An X-ray CT apparatus comprising: a target CT imaging region display unit that displays an image superimposed on a line image. 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;
In the state of being held between the X-ray source and the X-ray detector and holding the subject , the x-direction is the same direction as the X-ray optical axis, and the rotation axis is the same direction as the direction orthogonal to the X-ray optical axis. A table capable of translational movement in a certain z direction and rotational movement about a rotation axis;
An input device that is input to create a drive signal and that is input to specify a target CT imaging area;
A table drive mechanism for rotating and translating the table based on the drive signal;
A CT imaging execution unit that performs CT imaging by imaging a fluoroscopic X-ray image of a subject while rotating the table;
A transmission data storage unit for storing X-ray transmission data of a subject obtained by CT imaging;
A reconstruction calculation unit for reconstructing a tomographic image of a subject using the X-ray transmission data;
A display device for displaying images;
A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising:
Created by the reconstruction, z-direction in the image as at least two surfaces of the test tomographic images taken image and a vertical and a longitudinal tomographic image of a subject on the horizontal sectional image and the xy plane of the object is parallel to the xy plane perpendicular A test shot image display unit for displaying,
A target CT that outputs a drive signal for translational movement of the table so that the target CT imaging region is CT-photographed by designating a predetermined region in the trial image as a target CT imaging region by the input device. An X-ray CT apparatus comprising an imaging region moving unit. 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;
In the state of being held between the X-ray source and the X-ray detector and holding the subject , the x-direction is the same direction as the X-ray optical axis, and the rotation axis is the same direction as the direction orthogonal to the X-ray optical axis. A table capable of translational movement in a certain z direction and rotational movement about a rotation axis;
An input device that is input to create a drive signal and that is input to specify a target CT imaging area;
A table drive mechanism for rotating and translating the table based on the drive signal;
A CT imaging execution unit that performs CT imaging by imaging a fluoroscopic X-ray image of a subject while rotating the table;
A transmission data storage unit for storing X-ray transmission data of a subject obtained by CT imaging;
A reconstruction calculation unit for reconstructing a tomographic image of a subject using the X-ray transmission data;
A display device for displaying images;
A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising:
A camera for copying an appearance image associated with a positional relationship with a fluoroscopic X-ray image captured by an X-ray measurement optical system from at least two different directions;
At least two appearance images taken by the camera, including a horizontal appearance image of the subject parallel to the xy plane perpendicular to the z direction and a side appearance image of the subject perpendicular to the xy plane, are taken as trial images. A trial image display unit that displays an image as
A predetermined region in the test photograph image is designated as a target CT imaging region by the input device, so that the target CT imaging region is fluoroscopically X-rayed based on the positional relationship of the X-ray source, the X-ray detector, and the table. An X-ray CT apparatus comprising: a target CT imaging region display unit that displays an image superimposed on a line image. 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;
In the state of being held between the X-ray source and the X-ray detector and holding the subject , the x-direction is the same direction as the X-ray optical axis, and the rotation axis is the same direction as the direction orthogonal to the X-ray optical axis. A table capable of translational movement in a certain z direction and rotational movement about a rotation axis;
An input device that is input to create a drive signal and that is input to specify a target CT imaging area;
A table drive mechanism for rotating and translating the table based on the drive signal;
A CT imaging execution unit that performs CT imaging by imaging a fluoroscopic X-ray image of a subject while rotating the table;
A transmission data storage unit for storing X-ray transmission data of a subject obtained by CT imaging;
A reconstruction calculation unit for reconstructing a tomographic image of a subject using the X-ray transmission data;
A display device for displaying images;
A fluoroscopic X-ray image creation unit for displaying an image of a fluoroscopic X-ray image on the display device based on X-ray transmission data of a subject obtained from the current positional relationship of the X-ray source, the X-ray detector, and the table; An X-ray CT apparatus comprising:
A camera for copying an appearance image associated with a positional relationship with a fluoroscopic X-ray image captured by an X-ray measurement optical system from at least two different directions;
At least two appearance images including the horizontal appearance image of the subject parallel to the xy plane perpendicular to the z direction and the side appearance image of the subject perpendicular to the xy plane, which are captured by the camera, are used as test taken images. A test shot image display unit for displaying an image;
A target CT that outputs a drive signal for translational movement of the table so that the target CT imaging region is CT-photographed by designating a predetermined region in the trial image as a target CT imaging region by the input device. An X-ray CT apparatus comprising an imaging region moving unit. The target CT imaging region display unit calculates a target CT imaging possible region in conjunction with translation of the table, and updates the target CT imaging possible region displayed superimposed on the fluoroscopic X-ray image. The X-ray CT apparatus according to 1 or 3. The test image display unit includes a horizontal tomographic image and an xy plane of a subject parallel to the xy plane perpendicular to the z direction, which are created by reconstruction after performing CT imaging after the target CT imaging area is specified. 6. The X-ray according to claim 1, wherein at least two tomographic images including a vertical tomographic image of a subject perpendicular to the image are displayed as a new trial image. 6. CT device.