JP2014188220A - X-ray computer tomography apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce radiation exposure by scanography.SOLUTION: An X-ray computer tomography apparatus sets a reference position of a subject and a position of an affected part on a scanography image of the subject. Distance-setting means sets the reference position, and a distance to the position of the affected area along the subject's body axis direction. Imaging means captures an image for positioning the subject in a scope containing the reference position of the subject. The X-ray computer tomography apparatus sets the reference position of the subject on the image for positioning. Second affected area position setting means sets the position of the affected part on the basis of the reference position and the distance.

Description

  Embodiments described herein relate generally to an X-ray computed tomography apparatus.

  In the X-ray computed tomography apparatus, as shown in FIG. 9, scan imaging is performed wider than the scan range R2 so that the affected area A of the subject P can be reliably imaged by an operator's operation at the time of diagnosis. A range R1 is set.

  Subsequently, the X-ray computed tomography apparatus performs the scan imaging of the subject P based on the set scan imaging range R1, and displays the scan image as shown in FIG. The operator confirms the position of the affected area A based on the scanogram.

  Thereafter, the X-ray computed tomography apparatus determines the scan range R2 including the position of the affected area A in a range narrower than the scanoscope range R1 by the operation of the operator, and performs scan imaging.

  In this way, scano imaging is performed every time before scan imaging. The reason is that the position of the affected area A in the subject P is not known before the scan photographing, and the position of the affected area A cannot be determined because there is no reference position even when the patient sits on the bed with the same posture. Further, not only in the diagnosis but also in the regular examination of the affected area, scanography is performed every time.

JP 2009-226151 A

  The problem to be solved by the present invention is to provide an X-ray computed tomography apparatus capable of reducing exposure due to scanography.

  The X-ray computed tomography apparatus according to the embodiment includes a bed, first reference position setting means, first affected part position setting means, distance setting means, imaging means, second reference position setting means, and second affected part position setting. Means.

  The bed places a subject.

  The storage means sets the reference position of the subject in a scanogram obtained by scanning the subject within a range including the reference position of the subject and the position of the affected part.

  The first affected part position setting means sets the position of the affected part of the subject in the scanogram.

  The distance setting means is a distance between the set reference position and the set position of the affected part, and sets the distance along the body axis direction of the subject.

  The imaging means captures an image for positioning the subject within a range including a reference position of the subject.

  The second reference position setting means sets the reference position of the subject in the positioning image.

  The second affected area position setting means sets the position of the affected area based on the reference position set by the second reference position setting means and the distance set by the distance setting means.

It is a schematic diagram which shows the structure of the X-ray CT apparatus which concerns on 1st Embodiment. It is a flowchart for demonstrating the operation | movement in the embodiment. It is a schematic diagram for demonstrating the operation | movement in the embodiment. It is a schematic diagram which shows the scano image and camera image in the same embodiment. It is a schematic diagram which shows the structure of the X-ray CT apparatus which concerns on 2nd Embodiment. It is a schematic diagram for demonstrating the imaging | photography means in the same embodiment. It is a schematic diagram which shows the scanogram in the same embodiment. It is a flowchart for demonstrating the operation | movement in the embodiment. It is a schematic diagram which shows the range of general scano imaging | photography, and the range of scan imaging | photography. It is a schematic diagram which shows a general scano image.

  Hereinafter, an X-ray computed tomography apparatus (hereinafter referred to as an X-ray CT apparatus) according to each embodiment will be described with reference to the drawings.

<First Embodiment>
FIG. 1 is a schematic diagram showing a configuration of an X-ray CT apparatus according to the first embodiment. The X-ray CT apparatus includes a scan gantry 1, a bed 2, a computer device 3, and a camera 4. The scan gantry 1 is a component for collecting projection data related to the subject P placed on the bed 2. The projection data collected by the scan gantry 1 is subjected to processing such as image reconstruction and real prep in the computer device 3.

  The subject P is inserted into the cavity (imaging port) of the scan gantry 1 while being placed on the top plate 21 of the bed 2. The couchtop 2 of the couch 2 is driven by the couch driving unit 22 and moves in the body axis direction (Z axis) of the patient. That is, the bed 2 is an apparatus that enables the position of the placed subject P to be moved in the body axis direction. Usually, the bed 2 is installed such that the patient's body axis direction (Z-axis) is parallel to a rotation axis RA described later. The scan gantry 1 is provided with an annular rotary gantry (not shown) that is driven by the gantry rotation drive unit 11 and rotates about the rotation axis RA. An X-ray tube device 12 and an X-ray detector 13 are mounted on the rotating mount in a facing relationship. Therefore, the central axis of the field of view of tomographic images coincides with the rotation axis RA.

  The X-ray tube device 12 includes an X-ray tube 121 and an X-ray filter 122. The X-ray filter 122 removes low energy components to reduce exposure. In order to supply power to the X-ray tube 121, an inverter type high voltage generator 14 is provided. The high voltage generator 14 includes a high voltage transformer, a filament current generator, and a rectifier. In addition, the high voltage generator 14 includes a tube voltage switch, a filament current switch, and the like in order to adjust the tube voltage and the filament current arbitrarily or stepwise.

  The output of the X-ray detector 13 is supplied to the computer apparatus 3 via a data collection unit 15 and a slip ring (not shown) that enables continuous rotation.

  The computer apparatus 3 includes a scan control unit 31, a preprocessing unit 32, an image reconstruction unit 33, a scano generation unit 34, a storage unit 35, a display unit 36, and a console 37. These scan control unit 31, preprocessing unit 32, image reconstruction unit 33, scano generation unit 34, storage unit 35, display unit 36 and console 37 are connected to each other via a data / control bus 38.

  Data supplied from the scan gantry 1 to the computer apparatus 3 is supplied as projection data to the image reconstruction unit 33 or the scano generation unit 34 via the pre-processing unit 32, where the tomographic image data reconstruction process or scan image is generated. It is used for generation processing. The tomographic image data and scano image data are displayed on the display unit 36. The scanogram data is also supplied to the storage unit 35 and the scan control unit 31, and is used to set the imaging range of the tomographic image.

  The storage unit 35 is a storage device that can be read / written from the units 31 to 36 and the console 37. For example, the storage unit 35 scans the subject P within a range including the reference position of the subject P and the position of the affected part A. The scano image obtained by this is stored. As the reference position, for example, the position on the Z-axis of a portion whose appearance can be determined and whose form is stable, such as the position of the clavicle, is used.

  The console 37 is provided for an operator to input various information and various instructions including, for example, scanning conditions and a photographing range. The console 37 includes an operation screen. On the operation screen or display unit 36, the scan control unit 31 displays a setting screen suitably devised for assisting the operator to input the various information and various instructions. The console 37 writes the setting contents on the setting screen to the storage unit 35. The setting contents include, for example, the reference position of the subject P, the position of the affected part A of the subject, and the distance d between the reference position of the subject P and the position of the affected part A. That is, the console 37 has the following functions (f37-1) to (f37-5).

  (f37-1) First reference position for setting the reference position of the subject P on the scanogram obtained by scanning the subject P within the range including the reference position of the subject P and the position of the affected part A Setting function.

  (f37-2) A first affected area position setting function for setting the position of the affected area A of the subject P in the scanogram.

  (f37-3) A distance setting function for setting the distance d between the set reference position and the set position of the affected part A and along the body axis direction of the subject P . The distance d is obtained by subtracting the reference position from the position of the affected area A.

  (f37-4) A second reference position setting function for setting the reference position of the subject P in the positioning image. As the second reference position setting function (f37-4), a positioning image in which a reference position is set in advance at the first diagnosis is prepared in advance, and the initial positioning image and the positioning imaged at the time of the current diagnosis are prepared. A method may be used in which the reference position is set by aligning the image for use. Alternatively, a method may be used in which the positioning image at the time of the first diagnosis is omitted and the reference position is set to the positioning image captured at the time of the current diagnosis by the operation of the operator.

  (f37-5) The position of the affected area A is set based on the reference position set by the second reference position setting function (f37-4) and the distance d set by the distance setting function (f37-3) A second affected area position setting function. The position of the affected part A is obtained by adding the distance d to the reference position.

  The camera 4 is an optical camera provided with, for example, a CCD (Charge Coupled Device) as an image pickup device, picks up an optical image, and outputs image data indicating the optical image. The camera 4 is arranged side by side with the X-ray tube apparatus 12 in the scan gantry 1, for example, and images the subject P placed on the top plate 21 from above. In the present embodiment, the camera 4 constitutes an imaging unit that captures a positioning image of the subject P within a range including the reference position of the subject P. That is, in the present embodiment, the imaging unit is an optical camera, and the positioning image is a camera image captured by the optical camera.

  For example, the scan control unit 31 has the following functions (f31-1) to (f31-2).

  (f31-1) Based on the position of the affected area A set by the first affected area position setting function (f37-2), the bed 2 is changed so as to change the position of the subject P for the first scan image capturing. A first control function to control.

  (f31-2) The bed so that the position of the subject P is changed to capture the second and subsequent scan images based on the position of the affected part A set by the second affected part position setting function (f37-5) A second control function for controlling 2. Supplementally, each control function controls the bed 2 based on the scan range including the position of the affected part A. Note that the first control function and the second control function are arbitrary additional items and can be omitted. For example, when the couch 2 is controlled by the operation of the operator, the first control function and the second control function can be omitted.

  Next, the operation of the X-ray CT apparatus configured as described above will be described with reference to the flowchart of FIG. 2 and the schematic diagrams of FIGS.

  First, the scan control unit 31 determines whether or not a scan image G1 obtained by performing scan imaging of the subject P is in the storage unit 35 (ST1). Note that there is no scanogram G1 at the time of the first diagnosis (at the time of photographing), and there is a scanogram G1 at the time of the second or subsequent diagnosis (at the time of photographing).

  When the scan image G1 is not present as a result of the determination in step ST1 (ST1; NO), the scan control unit 31 controls the bed driving unit 22 and the scan gantry 1 and controls the subject P to the X-ray tube apparatus 12 and the camera 4. Position it below.

  Subsequently, the scan control unit 31 controls the scan gantry 1 to capture the camera image Gc and the scano image G1 of the subject P, respectively (ST2 to ST3). Note that the camera image Gc and the scano image G1 are preferably imaged under conditions where the enlargement / reduction magnification with respect to the subject P is substantially equal to each other from the viewpoint of facilitating alignment and the like.

  In step ST <b> 2, the camera 4 captures the camera image Gc of the subject P in the range R <b> 1 including the reference position Zs of the subject P under the control of the scan control unit 31, and sends the camera image Gc to the scan control unit 31. Send it out. The scan control unit 31 supplies the camera image Gc to the storage unit 35 and the display unit 36. The camera image Gc is displayed on the display unit 36.

  In step ST3, the X-ray tube 121 exposes the X-ray to the subject P, and the X-ray detector 13 detects the X-ray that has passed through the subject P in the range R1 including the reference position Zs and sends an output signal. To do. The data collection unit 15 converts the output signal of the X-ray detector 13 into digital data and supplies it to the computer apparatus 3. The data supplied from the scan gantry 1 to the computer apparatus 3 is supplied to the scano generation unit 34 as projection data via the preprocessing unit 32. The scano generation unit 34 generates a scano image G1 based on the projection data, and sends the scano image G1 to the storage unit 35 and the display unit 36. The scanogram G1 is displayed on the display unit 36. This scanogram G1 is an image including the position Za of the affected area A in addition to the reference position Zs.

  Here, the console 37 sets the reference position Zs in the camera image Gc by the user's operation (ST4). In the example shown in FIG. 4, the position of the clavicle of the subject P is set as the reference position Zs.

  The console 37 sets a reference position Zs corresponding to the reference position Zs of the camera image Gc in the scanogram G1 by a user operation (ST5). Step ST5 may be executed before step ST4. In that case, in step ST4 'executed later, a reference position Zs corresponding to the reference position Zs of the scanogram G1 is set in the camera image G1.

  Further, the console 37 sets the position Za of the affected part A of the subject P in the scanogram G1 by the user's operation (ST6). Any of steps ST5 and ST6 may be executed first.

  The console 37 sets a distance d between the reference position Zs set in the scanogram G1 in step ST5 and the position Za of the affected area A set in the scanogram G1 in step ST6 (ST7).

  Further, the console 37 sets a scan range R2 having a predetermined length including the position Za of the affected area A based on the position Za of the affected area A set in step ST6 (ST8). Thereafter, the console 37 sends the scan condition including the scan range R2 to the scan control unit 31.

  The scan control unit 31 starts scan shooting based on the scan condition. For example, the scan control unit 31 controls the scan gantry 1 based on the scan condition, and rotates the X-ray tube device 12 and the X-ray detector 13 around the subject P. Further, the scan control unit 31 controls the bed 2 so as to change the position of the subject P for the first scan image capturing based on the scan range R2. Thereby, a scan image is taken by a known operation (ST9).

  After step ST9, the scan image capturing at the time of the first diagnosis is completed.

  Next, the operation at the second and subsequent diagnosis will be described. That is, the operation when there is a scanogram G1 as a result of the determination in step ST1 (ST1; YES) will be described.

  If the scan image G1 is present as a result of the determination in step ST1, the scan control unit 31 controls the bed driving unit 22 and the scan gantry 1, and positions the subject P below the X-ray tube device 12 and the camera 4. Let

  Subsequently, the scan control unit 31 controls the camera 4 in the scan gantry 1 to capture the camera image Gc of the subject P (ST10). Note that the camera image Gc at the time of the current diagnosis and the camera image Gc at the time of the first diagnosis may be imaged under conditions where the enlargement / reduction ratios with respect to the subject P are substantially equal from the viewpoint of facilitating alignment and the like. preferable. In step ST <b> 10, the camera 4 captures the camera image Gc of the subject P in the range R <b> 1 including the reference position Zs of the subject P under the control of the scan control unit 31, and sends the camera image Gc to the scan control unit 31. Send it out. The scan control unit 31 supplies the camera image Gc to the storage unit 35 and the display unit 36. The camera image Gc is displayed on the display unit 36.

  For example, the console 37 aligns the camera image Gc captured in step ST2 during the first diagnosis with the camera image Gc captured in step ST10 during the current diagnosis. Further, the console 37 sets a reference position Zs corresponding to the reference position Zs in the camera image Gc at the time of the first diagnosis as the camera image Gc at the time of the current diagnosis (ST11).

  Subsequently, the console 37 sets the position Za of the affected area A based on the reference position Zs set in the camera image Gc in step ST11 and the distance d set in the scanogram G1 in step ST7 (ST12).

  Further, the console 37 sets a scan range R2 having a predetermined length including the position Za of the affected area A based on the position Za of the affected area A set in step ST12 (ST8). Thereafter, the console 37 sends the scan condition including the scan range R2 to the scan control unit 31.

  The scan control unit 31 starts scan shooting based on the scan condition. For example, the scan control unit 31 controls the scan gantry 1 based on the scan condition, and rotates the X-ray tube device 12 and the X-ray detector 13 around the subject P. Further, the scan control unit 31 controls the bed 2 to change the position of the subject P in order to capture the second and subsequent scan images based on the scan range R2. Thereby, a scan image is taken by a known operation (ST9).

  After step ST9, the scan image capturing at the second and subsequent diagnosis ends.

  As described above, according to the present embodiment, the reference position Zs and the distance d to the affected area A are set in the scanogram G1 at the first diagnosis. At the second and subsequent diagnoses, the position Za of the affected area A is set from the reference position Zs and the distance d of the camera image Gc, and the second and subsequent scan images are taken based on the position Za of the affected area A. Therefore, the exposure due to scanography can be reduced in the second and subsequent diagnoses.

  Thus, exposure can be reduced by performing scano imaging only at a necessary minimum (only the first time). In particular, the cumulative exposure dose can be suppressed in periodic examination of the affected area. In the present embodiment, the case where the bed 2 is moved in the body axis direction of the subject P has been described. However, the present invention is not limited to this. For example, the scan gantry 1 is fixed to the subject P with the position of the bed 2 fixed. The same effect can be obtained by carrying out the present embodiment in the same manner as the configuration of moving in the body axis direction. The same applies to the following embodiments.

<Second Embodiment>
FIG. 5 is a schematic diagram showing the configuration of the X-ray CT apparatus according to the second embodiment. The same reference numerals are given to the substantially same parts as those in FIG. 1, and detailed descriptions thereof are omitted. In the following.

  In the second embodiment, for example, even in a situation where the appearance reference and the affected part position information are required again, such as a situation where the appearance cannot be obtained by clothes, the position of the affected part is determined by performing the minimum necessary scano imaging. It can be set. Specifically, the position of the affected part is set based on the distance d from the reference position Zs, which is the position of the clavicle, as in the first embodiment.

  In the second embodiment, the camera 4 is omitted as compared with the configuration shown in FIG. Accordingly, in the second embodiment, as shown in FIGS. 6 and 7, the X-ray tube 121, the X-ray detector 13, and the like are within the range R3 including the reference position Zs of the subject P. Imaging means for imaging the positioning image (scano image G2). That is, in the second embodiment, the imaging unit includes the X-ray tube 121 and the X-ray detector 13 for scanography, and the positioning image does not include the position Za of the affected part A of the subject P. It is a scano image G2 imaged by R3.

  Next, the operation of the X-ray CT apparatus configured as described above will be described with reference to the flowchart of FIG.

  First, the scan control unit 31 determines whether or not a scan image G1 obtained by performing scan imaging of the subject P is in the storage unit 35 (ST21). Note that there is no scanogram G1 at the time of the first diagnosis (at the time of photographing), and there is a scanogram G1 at the time of the second or subsequent diagnosis (at the time of photographing).

  If the result of determination in step ST21 is that there is no scanogram G1 (ST21; NO), the scan control unit 31 controls the bed driving unit 22 and the scan gantry 1 to position the subject P below the X-ray tube apparatus 12. Let

  Subsequently, the scan control unit 31 controls the scan gantry 1 to capture a scanogram G1 of the subject P (ST22).

  In step ST22, the X-ray tube 121 exposes the X-rays to the subject P, and the X-ray detector 13 detects the X-rays transmitted through the subject P in the range R1 including the reference position Zs and sends an output signal. To do. The data collection unit 15 converts the output signal of the X-ray detector 13 into digital data and supplies it to the computer apparatus 3. The data supplied from the scan gantry 1 to the computer apparatus 3 is supplied to the scano generation unit 34 as projection data via the preprocessing unit 32. The scano generation unit 34 generates a scano image G1 based on the projection data, and sends the scano image G1 to the storage unit 35 and the display unit 36. The scanogram G1 is displayed on the display unit 36.

  The console 37 sets the reference position Zs in the scanogram G1 by a user operation (ST23).

  Further, the console 37 sets the position Za of the affected part A of the subject P in the scanogram G1 by the user's operation (ST24). Any of steps ST23 and ST24 may be executed first.

  The console 37 sets a distance d between the reference position Zs set in the scanogram G1 in step ST23 and the position Za of the affected area A set in the scanogram G1 in step ST24 (ST25).

  Further, the console 37 sets a scan range R2 having a predetermined length including the position Za of the affected area A based on the position Za of the affected area A set in step ST24 (ST26). Thereafter, the console 37 sends the scan condition including the scan range R2 to the scan control unit 31.

  The scan control unit 31 starts scan shooting based on the scan condition. For example, the scan control unit 31 controls the scan gantry 1 based on the scan condition, and rotates the X-ray tube device 12 and the X-ray detector 13 around the subject P. Further, the scan control unit 31 controls the bed 2 so as to change the position of the subject P for the first scan image capturing based on the scan range R2. Thereby, a scan image is taken by a known operation (ST27).

  After step ST27, the scan image capturing at the time of the first diagnosis is completed.

  Next, the operation at the second and subsequent diagnosis will be described. That is, the operation when there is a scanogram G1 as a result of the determination in step ST21 (ST21; YES) will be described.

  As a result of the determination in step ST <b> 21, when the scanogram G <b> 1 exists, the scan control unit 31 controls the bed driving unit 22 and the scan gantry 1 to position the subject P below the X-ray tube device 12.

  Subsequently, the scan control unit 31 controls the scan gantry 1 to capture a scanogram G2 of the subject P (ST28). The scanogram G2 is captured in the minimum necessary range R3. Here, the range R3 is a range including, for example, the reference position Zs of the subject P and not including the position Za of the affected part A of the subject P. In addition, the scano image G2 at the time of the current diagnosis and the scano image G1 at the time of the first diagnosis may be imaged under conditions where the enlargement / reduction magnification with respect to the subject P is substantially equal from the viewpoint of facilitating alignment and the like. preferable.

  In step ST28, the X-ray tube 121 exposes the X-rays to the subject P, and the X-ray detector 13 detects the X-rays transmitted through the subject P in the range R3 including the reference position Zs and sends out an output signal. To do. The data collection unit 15 converts the output signal of the X-ray detector 13 into digital data and supplies it to the computer apparatus 3. The data supplied from the scan gantry 1 to the computer apparatus 3 is supplied to the scano generation unit 34 as projection data via the preprocessing unit 32. The scano generation unit 34 generates a scano image G2 based on the projection data, and sends the scano image G2 to the storage unit 35 and the display unit 36. The scanogram G2 is displayed on the display unit 36.

  For example, the console 37 aligns the scano image G1 captured at the time of the first diagnosis with the scano image G2 captured at the time of the current diagnosis. Further, the console 37 sets the reference position Zs corresponding to the reference position Zs in the scano image G1 at the time of the first diagnosis as the scano image G2 at the time of the current diagnosis (ST29).

  Subsequently, the console 37 sets the position Za of the affected area A based on the reference position Zs set in step ST29 and the distance d set in step ST25 (ST30).

  Further, the console 37 sets a scan range R2 having a predetermined length including the position Za of the affected area A based on the position Za of the affected area A set in step ST30 (ST26). Thereafter, the console 37 sends the scan condition including the scan range R2 to the scan control unit 31.

  The scan control unit 31 starts scan shooting based on the scan condition. For example, the scan control unit 31 controls the scan gantry 1 based on the scan condition, and rotates the X-ray tube device 12 and the X-ray detector 13 around the subject P. Further, the scan control unit 31 controls the bed 2 to change the position of the subject P in order to capture the second and subsequent scan images based on the scan range R2. Thereby, a scan image is taken by a known operation (ST27).

  After step ST27, the imaging of the scan image at the second and subsequent diagnosis ends.

  As described above, according to the present embodiment, the reference position Zs and the distance d to the affected area A are set in the scan image G1 in the wide range R1 during the first diagnosis. At the second and subsequent diagnoses, the position Za of the affected area A is set from the reference position Zs and the distance d of the scanogram G2 in the narrow range R3, and the second and subsequent scan images are taken based on the position Za of the affected area A. Do. Therefore, the exposure due to scanography can be reduced in the second and subsequent diagnoses.

  According to at least one embodiment described above, a positioning image is captured at the second and subsequent diagnoses, and the second and subsequent scan images are captured based on the position Za of the affected area A set by the positioning image. Do. Accordingly, exposure by scanography can be reduced during the second and subsequent diagnoses.

  In addition, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

  DESCRIPTION OF SYMBOLS 1 ... Scan gantry, 2 ... Bed, 3 ... Computer apparatus, 4 ... Camera, 11 ... Mount rotation drive part, 12 ... X-ray tube apparatus, 121 ... X-ray tube, 122 ... X-ray filter, 13 ... X-ray detector , 14 ... high voltage generation unit, 15 ... data collection unit, 21 ... top plate, 22 ... bed driving unit, 31 ... scan control unit, 32 ... preprocessing unit, 33 ... image reconstruction unit, 34 ... scano generation unit, 35 ... storage unit, 36 ... display unit, 37 ... console, 38 ... data / control bus, A ... affected part, d ... distance, G1-G3 ... scano image, Gc ... camera image, P ... subject, R1-R3 ... range, RA ... rotation axis, Za ... position of affected area, Zs ... reference position.

Claims (4)

A bed on which the subject is placed;
First reference position setting means for setting the reference position of the subject on a scanogram obtained by scanning the subject within a range including the reference position of the subject and the position of the affected part;
First affected area position setting means for setting the position of the affected area of the subject in the scanogram;
Distance setting means for setting the distance along the body axis direction of the subject, which is a distance between the set reference position and the set position of the affected part;
Imaging means for capturing an image for positioning the subject within a range including a reference position of the subject;
Second reference position setting means for setting a reference position of the subject in the positioning image;
Second affected area position setting means for setting the position of the affected area based on the reference position set by the second reference position setting means and the distance set by the distance setting means;
An X-ray computed tomography apparatus comprising: The X-ray computed tomography apparatus according to claim 1,
The imaging means is an optical camera;
The X-ray computed tomography apparatus, wherein the positioning image is a camera image captured by the optical camera. The X-ray computed tomography apparatus according to claim 1,
The imaging means includes an X-ray tube and an X-ray detector for the scano imaging,
The X-ray computed tomography apparatus, wherein the positioning image is a scanogram captured in a narrower range than the scanogram. The X-ray computed tomography apparatus according to any one of claims 1 to 3,
The X-ray computed tomography apparatus characterized in that the bed can move the position of the subject placed in the body axis direction.

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