JP2006158423A - Image diagnostic apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image diagnostic apparatus permitting easy making of a scanning plan of a diagnostic image in an arbitrary area. <P>SOLUTION: An X-ray CT apparatus 1 comprises a three-dimensional model creating part 30b for creating a three-dimensional model of a subject H based on a low-dose helical scan, a display device 32 for displaying the three-dimensional model, a display area setting part 30c for setting the display area of the diagnostic image for the three-dimensional model based on the input operation in an input device 31, a position specifying part 30d for specifying the scanning position to obtain data on the diagnostic image in the set display area, and a control part 20a for controlling a rotary part 27 and a cradle 41 to execute the imaging process in the specified scanning position. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an image diagnostic apparatus such as an X-ray CT apparatus and an MRI apparatus, and more particularly to an image diagnostic apparatus capable of making a scan plan based on an image of a subject acquired in advance.

  In the diagnostic imaging apparatus, a scan plan for setting scan conditions such as a scan position is performed in order to obtain a necessary image with high image quality while reducing the burden on the subject. As such an image diagnostic apparatus, an X-ray CT apparatus that makes a scan plan based on an image from one viewpoint, which is called a so-called scout image, is known (for example, Patent Document 1).

  FIG. 11 shows a scan planning workflow in a conventional X-ray CT apparatus. The scan plan in step S102 is performed via an input screen SC12 displayed on the monitor of the X-ray CT apparatus as shown in FIG. A scout image 121 is displayed on the input screen SC12.

In the scout image 121, a subject image 122 having a view direction in a direction (x-axis direction) perpendicular to the body axis direction (z-axis direction) is displayed. When the operator moves the cursor 123 to an arbitrary position on the subject image 122 by performing an operation on the input device of the X-ray CT apparatus and performs a predetermined determination operation, a start line SL indicating the start position of the region to be scanned and An end line EL for ending the scan is displayed on the scout image 121. Each line SL, EL is set in a direction orthogonal to the body axis direction.
JP-A-8-289887

  However, in the above technique, in order to make a scan plan based on a two-dimensional image, only a cross section perpendicular to the image plane can be set, and a cross section parallel to the image plane or a cross section inclined with respect to the image plane can be set. It cannot be set. That is, the range in which a scan plan can be made is narrow.

  In order to obtain a tomographic image other than a cross section perpendicular to the image plane, the operator must make an optimal scan plan while imagining a three-dimensional model of the subject based on the scout image. The image quality is also affected by the skill of the operator in the scan plan.

  In general, in a CT apparatus or the like, only a scan plan of an axial section perpendicular to the body axis of the subject can be set on a scout image, and the above-described inconvenience occurs in all sections other than the axial section. .

  An object of the present invention is to provide an image diagnostic apparatus that can easily make a scan plan for a diagnostic image in an arbitrary region.

  An image diagnostic apparatus according to a first aspect of the present invention is an image diagnostic apparatus that plans an imaging position for a diagnostic image based on a planning image obtained by imaging a subject, and is a three-dimensional image as a planning image. Is used.

  An image diagnostic apparatus according to a second aspect of the present invention is an image diagnostic apparatus that plans an imaging position for a diagnostic image on the basis of a planning image obtained by imaging a subject. Is used.

  An image diagnostic apparatus of the present invention is an image diagnostic apparatus that plans an imaging position for a diagnostic image based on a planning image obtained by imaging a subject, and executes imaging processing on the subject, Diagnostic imaging means for acquiring diagnostic image information for generating the diagnostic image, moving means for relatively moving the subject and the diagnostic imaging means, and a plurality of Based on information obtained by the planning photographing means for executing the photographing processing from the viewpoint and acquiring the planning image information for generating the planning image for a plurality of viewpoints, and the information obtained by the planning photographing means. The diagnostic image information in the display area set by the 3D model creating means for creating the 3D model of the specimen, the display means for displaying the 3D model, and the display area setting means is obtained. An imaging plan means for performing an imaging plan by the use imaging means, and an imaging process by the diagnostic imaging means in a state in which the subject and the diagnostic imaging means are relatively moved to the relative position specified by the position specifying means And a control means for performing. Note that the display area setting unit sets, for example, a display area displayed by the diagnostic image for the three-dimensional model based on an input operation on the input unit. The imaging plan unit, for example, performs the imaging process by the diagnostic imaging unit and the diagnostic image so that the diagnostic image information in the display region set by the display region setting unit is obtained. Position specifying means for specifying a relative position with the imaging means is included. For example, the control unit may perform the imaging process by the diagnostic imaging unit in a state in which the subject and the diagnostic imaging unit are relatively moved to the relative position specified by the position specifying unit. The diagnostic imaging means and the moving means are controlled.

  Preferably, the display means can display the three-dimensional model from a plurality of viewpoints.

  Preferably, the planning imaging unit is fixedly provided with respect to the diagnostic imaging unit, and the planning image is obtained by relative movement between the subject and the planning imaging unit by the moving unit. Get information on multiple viewpoints.

  Preferably, the planning photographing means is also used as the diagnostic photographing means.

  Preferably, the planning and diagnosis imaging means irradiates the subject with radiation to execute the imaging process, and the planning image imaging process is more effective than the diagnostic image imaging process. This is executed so that the radiation dose to be irradiated is reduced. The same may be applied to an imaging unit that does not emit radiation. That is, the planning image capturing process may be executed so as to reduce the burden on the subject. For example, the imaging process of the diagnostic and planning imaging means may be executed so that the planning image has a data amount smaller than that of the diagnostic image.

  Preferably, the imaging process for the diagnostic image and the imaging process for the planning image are executed while moving the diagnostic and planning imaging unit in a spiral relative to the subject. .

  Preferably, the moving means relatively moves the subject and the diagnostic imaging means in a body axis direction of the subject and a rotation direction around the body axis, and the display area setting means A cross section inclined with respect to the direction and the direction orthogonal to the body axis can be set as the display region.

  Preferably, the moving means relatively moves the subject and the diagnostic imaging means in a body axis direction of the subject and a rotation direction around the body axis, and the display area setting means A cross section parallel to the direction can be set as the display area.

  Preferably, the display area setting means can set a plurality of cross-sections inclined to each other as the display area.

  Preferably, the display area setting means can set a three-dimensional display area.

  Preferably, the display area setting means can set a predetermined organ of the subject as the display area.

  According to the present invention, a scan plan for a diagnostic image in an arbitrary region can be easily made.

  FIG. 1 is a block diagram illustrating an overall configuration of an X-ray CT apparatus 1 as a radiation CT apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic diagram illustrating an imaging state of the X-ray CT apparatus 1.

  The X-ray CT apparatus 1 is configured as a CT apparatus that collects projection data of a subject from a plurality of view directions by so-called helical scanning and performs image reconstruction based on the projection data. The present invention is also applicable to a non-helical scan X-ray CT apparatus.

  The X-ray CT apparatus 1 includes a scanning gantry 2, an operation console 3, and an imaging table 4.

  The scanning gantry 2 detects an X-ray from the X-ray tube 20 as a radiation source, a collimator 22 for shaping the radiation from the X-ray tube 20, and the X-ray from the X-ray tube 20, and an electrical signal corresponding to the detected X-ray dose , An X-ray detector 23 that outputs projection data, a data acquisition unit (DAS) 24 that collects projection data based on the electrical signal output from the X-ray detector 23, and an X-ray tube controller 25 that controls the driving of the X-ray tube 20. And a collimator controller 26 that drives and controls the collimator 22. Further, the scanning gantry 2 includes an X-ray tube 20 and an X-ray detector 23, and includes a rotating unit 27 that rotates integrally therewith, and a rotation controller 28 that drives and controls the rotating unit 27. The scanning gantry 2 includes a bore 29 into which a subject is carried, and an X-ray tube 20 and an X-ray detector 23 are disposed to face each other with the bore (cavity) 29 interposed therebetween. For example, the X-ray tube controller 25 controls the tube current (mA) of the X-ray tube 20 based on a control signal from the central processing unit 30 to adjust the intensity of X-rays irradiated by the X-ray tube 20. The rotation unit 27 is driven and controlled based on a control signal from the central processing unit 30 via the rotation controller 28.

  The operation console 3 converts the projection data collected by the data collection unit 24 based on signals from the input device 31 that outputs a signal according to the input operation of the operator and various devices such as the input device 31 and the scanning gantry 2. A central processing unit 30 for executing various processes such as image reconstruction processing based on the image, a display device 32 for displaying a CT image reconstructed by the central processing unit 30, and a program and data used for the processing of the central processing unit 30 And a storage device 7 for storing X-ray CT images.

  The imaging table 4 includes a cradle 41 on which a subject is placed and which is taken in and out of the bore 29 of the scanning gantry 2. The cradle 41 is driven by, for example, a servo motor (not shown) built in the imaging table 4, and the servo motor is controlled based on a control signal from the central processing unit 30 via a servo amplifier (not shown). The cradle 41 is driven in the body axis direction (z-axis direction) of the subject as shown in FIG.

  The central processing unit 30 includes a control unit 30a that drives and controls the X-ray tube 20, the rotation unit 27, and the cradle 41 via the X-ray tube controller 25, the rotation controller 28, and a servo amplifier built in the imaging table 4, respectively. Based on a signal from the input device 31 and a 3D model creation unit 30b that creates a 3D model of the subject based on data from the data collection unit 24 and which region of the subject is to be acquired as a diagnostic image. A display area setting unit 30c to be set in advance, and a scan position specifying unit 30d for specifying a scan position based on the setting of the display area setting unit 30c. In addition to this, the central processing unit 30 includes a processing unit that realizes various functions such as image reconstruction based on data from the data collection unit 24 and a three-dimensional display function, which are appropriately configured by a known technique. You can do it.

  As shown in FIG. 2, the X-ray tube 20 and the X-ray detector 23 rotate around the body axis of the subject H. On the other hand, the cradle 41 conveys the subject in the body axis direction. Therefore, the X-ray tube 20 and the X-ray detector relatively move around the subject H in a spiral shape. The X-ray tube 20 irradiates the subject H with radiation B having a predetermined intensity at a position determined by the scan plan, and the radiation B is partially absorbed by the subject and detected by the X-ray detector 23. Thereby, information necessary for generating an image of the subject H is obtained.

  In the above configuration, the X-ray tube 20 and the X-ray detector 23 function as diagnostic and planning imaging means, and the rotating unit 27 and the cradle 41 function as moving means, respectively. The process of irradiating the subject with X-rays by the X-ray tube 20 and detecting the X-rays by the X-ray detector 23 corresponds to the imaging process. The radiation dose detected by the X-ray detector 23 corresponds to information necessary for generating a planning image or a diagnostic image. In the following, the whole means for determining the scan position, such as the three-dimensional model creation unit 30b, the display area setting unit 30c, the scan position specifying unit 30d, the input device 31, the display device 32, is referred to as a (three-dimensional) localizer. Sometimes.

  FIG. 3 is a diagram showing a workflow in the X-ray CT apparatus 1. In the X-ray CT apparatus 1, first, a helical scan is performed in order to acquire a planning image used for a scanning plan (step S1). This helical scan does not have to be a scan condition that can obtain an image as high in quality as a diagnostic image used for diagnosis. In other words, in exchange for a certain degree of image quality degradation, it is possible to set a scan condition that reduces exposure or improves the speed of scanning. For example, the radiation dose may be reduced (Low Dose) as compared to the scan for acquiring a diagnostic image. The helical pitch and slice thickness may be set large.

  Next, the display area of the diagnostic image, for example, an arbitrary cross section of the subject is set by the operator via the three-dimensional localizer, and a scan plan is performed (step S2). In this step, the three-dimensional model created based on the scan data obtained in step S1 is displayed on the scan plan screen of the display device 32, and the display area is set via the screen. Then, a scan position necessary or optimal for obtaining an image of the display area is specified, the relative position between the subject H and the X-ray tube when scanning at the scan position, and the beam width defined by the collimator 22 Scan conditions such as are specified.

  In step S3, scanning is performed based on the scan plan set in step S2. For example, the central processing unit 30 drives the rotating unit 27 and the cradle 41, and when the relative position between the subject H and the X-ray tube 20 set in step S2 is reached, a predetermined intensity is obtained from the X-ray tube 20. The data from the data collection unit 24 is recorded in the storage device 33. In step S4, an image of the display area planned based on the scan data is generated. The generated image or image data is appropriately output to an output device such as the display device 32, the storage device 33, a printer (not shown).

  The image of the display area may be generated by various known techniques. For example, when the display area is set as a three-dimensional area and it is necessary to perform three-dimensional display, a known three-dimensional display technique such as MPR may be used. Further, an image such as an axial cross section generated in the process of generating a three-dimensional image may or may not be output to an output device such as the display device 32.

  In the X-ray CT apparatus 1, since a three-dimensional model is displayed on the display device 32 and a scan plan is made in step S <b> 2 described above, a wider variety of regions are displayed compared to the conventional technique in which only an axial section can be planned. It can be set as an area. Hereinafter, a method for setting a display area in the X-ray CT apparatus 1 will be described while showing an example of the screen of the display device 32.

  FIG. 4 shows a scan plan screen SC1 of the display device 32 when a cross section (oblique cross section) inclined with respect to the body axis of the subject is used as a display area. On the screen SC1, the subject image HP is displayed in a perspective manner with the body axis direction at the top of the drawing. However, the subject is displayed from an appropriate viewpoint by a predetermined operation on the input device 31. In the following drawings, the subject image HP is schematically shown.

  The planes 51 and 52 displayed on the screen SC1 are objects indicating display areas. The planes 51 and 52 are set by a predetermined operation on the input device 31. For example, the input device 31 is operated to move the cursor CP to a predetermined position with respect to the subject image HP on the screen SC1, and the planes 51 and 52 are set at arbitrary positions by performing a predetermined determination operation. Can do. In other words, the display area can be set via the screen of the display device. More specifically, by moving the object (cursor) for displaying the designated position relative to the three-dimensional model displayed on the display device, The display area can be set. If the above steps S3 and S4 are executed under this setting, a tomographic image of the subject on the planes 51 and 52 is obtained. Note that a plurality of tomographic images at a predetermined interval between the planes 51 and 52 may be obtained. Further, instead of the flat surfaces 51 and 52, the cross section may be set by a curved surface.

  FIG. 5 shows a scan plan screen SC2 of the display device 32 in a case where a surface (cross section perpendicular to the y axis, coronal section) cut in parallel to the body axis from the side of the subject is used as a display area. On the screen SC2, the subject image HP is displayed with the body axis direction as the upper side in the drawing, and a plane 53 indicating the display area is displayed. Similarly to the planes 51 and 52 in FIG. 4, the plane 53 is set by an operation such as moving the cursor on the screen SC2. If the above steps S3 and S4 are executed under this setting, a tomographic image of the subject on the plane 53 is obtained.

  FIG. 6 shows a scan plan screen SC3 of the display device 32 when a surface (cross section perpendicular to the x axis, sagittal section) cut in parallel to the body axis from the front side of the subject is used as the display region. On the screen SC3, the subject image HP is displayed with the body axis direction at the top of the drawing, and planes 55 and 56 indicating the display area are displayed. Similarly to the planes 51 and 52 of FIG. 4, the planes 55 and 56 are set by an operation such as moving the cursor on the screen SC3. If the above-described steps S3 and S4 are executed under this setting, the planes 55 and 56 are set. A tomographic image of the subject is obtained.

  FIG. 7 shows a scan plan screen SC4 of the display device 32 in the case where a plurality of cross sections inclined with respect to each other are used as a display area. On the screen SC4, the subject image HP is displayed with the body axis direction at the top of the drawing, and planes 58 and 59 indicating the display area are displayed. Similarly to the planes 51 and 52 in FIG. 4, the planes 58 and 59 are set by an operation such as moving the cursor on the screen SC4, and if the above-described steps S3 and S4 are executed under this setting, the planes 58 and 59 are set. A tomographic image of the subject is obtained.

  FIG. 8 shows the scan plan screen SC5 of the display device 32 when the three-dimensional area is used as the display area. On the screen SC5, the subject image HP is displayed with the body axis direction at the top of the page, and a cube 61 indicating the display area is displayed. Similarly to the planes 51 and 52 in FIG. 4, the cube 61 is set by an operation such as moving the cursor on the screen SC5. If the above steps S3 and S4 are executed under this setting, the cube 61 is designated. A three-dimensional image of the region is obtained. The three-dimensional display area may be set in an appropriate shape and is not limited to a cube.

  As shown in FIG. 8, when the display region exists in a part of the axial cross section of the subject H, the fan-shaped X-ray from the X-ray tube 20 has a width over the entire axial cross section of the subject H. It is not necessary to have a width that can irradiate only the range of the cube 61 as the display area. Therefore, the central processing unit 30 may realize a low exposure by setting the control amount of the collimator 22 at the time of scanning so that the X-ray width becomes narrower than the width of the subject.

  FIG. 9 shows a scan plan screen SC6 of the display device 32 when an arbitrary organ is used as a display area. On the screen SC6, the subject image HP is displayed with the body axis direction at the top of the drawing. The subject image HP includes images of various organs such as a heart image HCP, an aorta image HAP on both legs, a liver image HLP, and a large intestine image HIP. The operator can set the organ as a display area by moving the cursor to an arbitrary organ and performing a predetermined determination operation. FIG. 9 shows a state in which the heart HCP indicated by the solid line and the aorta HAP to both legs are selected as display areas, and the liver HLP, colon HIP, etc. indicated by the dotted line are not selected. If steps S3 and S4 described above are executed under this setting, a three-dimensional image of the aorta to the heart and both feet is obtained. Note that a two-dimensional image from an arbitrary viewpoint of an arbitrary organ may be obtained.

  For example, after the helical scan for the planning image (see step S1 in FIG. 3) is completed, the central processing unit 30 determines whether each organ has been selected by the operator. The CT value is compared with the average CT value and coordinate position of each organ, which organ is located over which range, and the organ is associated with the coordinates of the three-dimensional model Data is created in advance, and then, when an operation for selecting an organ is performed on the input screen shown in FIG. 9, the selected organ is identified based on the coordinates specified by the cursor CP and the above data. That's fine. In addition, when the area where the selected organ exists is set as the display area, the coordinates where the selected organ exists are specified based on the selected organ and the above data, and the three-dimensional model is identified. The coordinates of the display area may be set.

  Such setting of the display area can be realized by causing the central processing unit 30 to execute appropriate processing, and the processing procedure can be variously combined. FIG. 10 is a flowchart illustrating an example of the procedure of the scan planning process executed by the central processing unit 30 for setting the display area. This process is executed in step S2 of FIG.

  In step S11, the central processing unit 30 generates data of the three-dimensional model of the subject based on the data obtained by the helical scan for the planning image (see step S1 in FIG. 3), and stores it in the storage device 33. Let The data of the three-dimensional model of the subject is data that holds the position information of each part of the subject as three-dimensional position information. For example, the CT value in each part of the subject obtained by the helical scan on the subject is three-dimensionally obtained. Are stored in association with the actual coordinates.

  Next, the central processing unit 30 converts the coordinates of the three-dimensional model into pixel coordinates on the screen of the display device 32 and displays them on the display device 32 (step S12). And it waits until input operation with respect to the input device 31 is made (step S13).

  When an operation is performed on the input device 31, the central processing unit 30 determines whether or not the operation is to set a display area (step S <b> 14). Is created and stored in the storage device 33 (step S15). For example, if the display area is a cross section at a predetermined position of the subject, the information on the display area is information that can specify the cross section such as the position, range, and angle of the cross section. For example, coordinate data of a point passing through the cross section It is. When the display area is set by moving the cursor on the screen, the pixel coordinates of the cursor position on the screen of the display device 32 are acquired, and the position information of the cross section is recorded as pixel coordinate information on the screen. Is done. If it is determined that the operation is not for setting a display area, step S15 is skipped.

  In step S16, the screen of the display device 32 is updated according to the input operation in step S13 (step S16). For example, when the viewpoint changing operation for displaying the subject image HP is performed on the input device 31, the subject image HP whose viewpoint is changed according to the operation is displayed. The change of viewpoint may be changed between two or more viewpoints. The operator may switch the viewpoint to be used between a plurality of predetermined viewpoints, or the operator may be able to set an arbitrary viewpoint. The viewpoint may be moved continuously, and the subject image may appear as a moving image, or may be intermittently performed. The operator can easily grasp the subject three-dimensionally by visually recognizing the subject image from an arbitrary viewpoint.

  When an operation for setting a display area is performed, the image is updated to show the display area. For example, as shown in FIG. 4, an object indicating a display area such as the plane 51 is newly displayed, or only the selected organ (area) is displayed with brightness and color different from other organs as shown in FIG. Update the image.

  Thereafter, it is determined whether or not a display region setting confirmation operation has been performed on the input device 31 (step S17). If it is determined that a confirmation operation has not been performed, steps S13 to S16 are repeated. If it is determined that the confirmation operation has been performed, the process proceeds to step S18.

  In step S <b> 18, the position information indicating the display area acquired with the pixel coordinates of the screen of the display device 32 in step S <b> 15 is converted into real coordinates and stored in the storage device 33.

  In step S19, a scan position necessary or optimal for image generation of the display area is specified and stored in the storage device 33. For example, based on the relative position between the display area and the cradle 41, the relative position between the cradle 41 and the X-ray tube 20 that can irradiate the display area with the X-ray tube 20 is specified. The data is stored in the storage device 33. Note that the relative position between the display area and the cradle 41 is specified by, for example, a helical scan for planning images (step S1 in FIG. 3).

  In step S <b> 19, the central processing unit 30 specifies and sets not only the scan position but also various values of scan conditions such as the helical pitch, slice thickness, and X-ray intensity that are necessary or optimal for image generation of the display area. It's okay. Further, when specifying the scan position and these other scan conditions, they may be specified with reference to various parameters set by the operator. For example, the operator can set priority settings such as whether to give priority to the end of scanning within a predetermined breath-hold time, low exposure, or image quality improvement, and specify various scanning conditions based on the priority You may do it.

  FIG. 10 shows an example of scan plan processing, which can be changed as appropriate. For example, step S18 may be executed between steps S15 and S16. At this time, a step of confirming whether or not the operator's setting is within an appropriate range based on the actual coordinates of the display area may be added. Good. After step S17, a confirmation step as to whether or not a display area is set may be added.

  The central processing unit 30 functions as a three-dimensional model creation unit when executing step S11, as a display area setting unit when executing steps S13 to S18, and as a position specifying unit when executing step S19.

  According to the above embodiment, a three-dimensional model of a subject is displayed on the display device 32, a scan plan is made based on the display, and a scan is performed according to the scan plan. The display area can be set by angle and range. This also eliminates the need for the operator to make a scan plan while imagining a three-dimensional model from the scout image, thereby reducing the burden on the operator.

  The present invention is not limited to the above embodiment, and may be implemented in various aspects.

  The image diagnostic apparatus is not limited to an X-ray CT apparatus as long as a scan plan is made based on an image of a subject acquired in advance. For example, an MRI apparatus or a PET (Positron Emission Tomography) CT apparatus may be used. In the MRI apparatus, processing for detecting magnetic resonance applied to the subject corresponds to imaging processing, and in the PETCT apparatus, processing for detecting photons from the subject corresponds to imaging processing. That is, a process for detecting any signal from the subject that includes information for generating an image of the subject corresponds to the imaging process.

  A three-dimensional model refers to one that includes three-dimensional position information of a predetermined part of a subject. Therefore, the viewpoint of the imaging means when obtaining the three-dimensional model may be set as appropriate as long as the three-dimensional position information of the predetermined part of the subject can be obtained, and is not limited to the imaging by the helical scan. For example, a three-dimensional model may be created based on two scout images in the viewpoint directions orthogonal to each other. It is not limited to obtaining images from a plurality of viewpoints by moving the imaging means relative to the subject, and images from a plurality of viewpoints may be acquired by providing a plurality of imaging means.

  Any planning imaging means for obtaining a three-dimensional model may be used as long as the position coordinates of a predetermined part of the subject can be specified. For example, an optical camera may be used as the planning photographing means. In this case, a three-dimensional model may be created by specifying three-dimensional coordinates for a plurality of reference points of a subject arbitrarily set by marking or the like. In the case of using an optical camera, when the diagnostic imaging apparatus is an X-ray CT apparatus, further lower exposure is realized as compared with a case where a planned image of a subject is obtained by X-rays.

1 is a diagram showing a schematic configuration of an X-ray CT apparatus according to an embodiment of the present invention. Schematic which shows the imaging process of the X-ray CT apparatus of FIG. The figure which shows the workflow in the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The figure which shows the example of the scan plan screen of the X-ray CT apparatus of FIG. The flowchart which shows the procedure of the scan plan process which the central processing unit of the X-ray CT apparatus of FIG. 1 performs. The figure which shows the workflow in the conventional X-ray CT apparatus. The figure which shows the scan plan screen in the conventional X-ray CT apparatus.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Image diagnostic apparatus 20, 23 ... Imaging | photography means for diagnosis, 27, 41 ... Moving means, 30b ... Three-dimensional model preparation means, 30c ... Display area setting means, 30d, Position specification means, 30a ... Control means .

Claims (13)

An image diagnostic apparatus that plans an imaging position for a diagnostic image based on a planning image obtained by imaging a subject,
An image diagnostic apparatus using a three-dimensional image as the planning image. An image diagnostic apparatus that plans an imaging position for a diagnostic image based on a planning image obtained by imaging a subject,
An image diagnostic apparatus using three-dimensional data for the planning image. An image diagnostic apparatus that plans an imaging position for a diagnostic image based on a planning image obtained by imaging a subject,
Diagnostic imaging means for performing imaging processing on the subject and acquiring diagnostic image information for generating the diagnostic image;
Moving means for relatively moving the subject and the diagnostic imaging means;
Planning imaging means for performing imaging processing on the subject from a plurality of viewpoints and acquiring planning image information for generating the planning image for a plurality of viewpoints;
3D model creation means for creating a 3D model of the subject based on information acquired by the planning imaging means;
Display means for displaying the three-dimensional model;
An imaging plan means for performing an imaging plan by the diagnostic imaging means so that the diagnostic image information in the display area set by the display area setting means can be obtained;
Control means for performing imaging processing by the diagnostic imaging means in a state in which the subject and the diagnostic imaging means are relatively moved to a relative position designated by the imaging planning means;
An image diagnostic apparatus comprising: The diagnostic imaging apparatus according to claim 3, wherein the display unit can display the three-dimensional model from a plurality of viewpoints. The planning imaging unit is fixedly provided with respect to the diagnostic imaging unit, and the planning image information is obtained by a relative movement between the subject and the planning imaging unit by the moving unit. The diagnostic imaging apparatus according to claim 3, wherein the diagnostic imaging apparatus acquires the viewpoint. The image diagnostic apparatus according to claim 3, wherein the planning imaging unit is also used as the diagnostic imaging unit. The planning and diagnostic imaging means execute the imaging process by irradiating the subject with radiation,
The image diagnosis apparatus according to claim 6, wherein the planning image capturing process is executed such that a radiation dose to be irradiated onto the subject is smaller than the diagnostic image capturing process. 6. The imaging process for the diagnostic image and the imaging process for the planning image are executed while moving the diagnostic and planning imaging unit in a spiral relative to the subject. 8. The diagnostic imaging apparatus according to any one of items 7. The moving means relatively moves the subject and the diagnostic imaging means in the body axis direction of the subject and the rotation direction around the body axis,
The diagnostic imaging apparatus according to any one of claims 3 to 8, wherein the display area setting means can set a cross section inclined with respect to the body axis direction and a direction orthogonal to the body axis as the display area. . The moving means relatively moves the subject and the diagnostic imaging means in the body axis direction of the subject and the rotation direction around the body axis,
The diagnostic imaging apparatus according to any one of claims 3 to 9, wherein the display area setting means can set a cross section parallel to the body axis direction as the display area. The diagnostic imaging apparatus according to any one of claims 3 to 10, wherein the display area setting means can set a plurality of cross-sections that are inclined to each other as the display area. The diagnostic imaging apparatus according to claim 3, wherein the display area setting unit can set a three-dimensional display area. The diagnostic imaging apparatus according to any one of claims 3 to 12, wherein the display area setting means can set a predetermined organ of the subject as the display area.

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