JP4701015B2 - X-ray CT system - Google Patents

Description

  The present invention relates to an X-ray CT apparatus for obtaining a cross-sectional image of a subject.

  A CT (Computer Tomography) apparatus using radiation such as X-rays is widely used in the medical field and the like in order to obtain a cross-sectional image of a subject. When performing CT imaging, it is known to collect a transmission two-dimensional image (also referred to as a plan image) prior to CT imaging in order to determine the CT imaging region of the subject (see Patent Document 1). . Patent Document 1 discloses an industrial X-ray CT apparatus that obtains CT data by placing a subject on a mounting table disposed between an X-ray irradiating unit and an X-ray detecting unit arranged to face each other and rotating the mounting table. Are listed. The mounting table is movable up and down with respect to the X irradiation unit that determines the slice position so that the CT imaging region can be changed. Patent Document 1 describes performing digital radiography (DR imaging) to obtain a transmission two-dimensional image by performing X-ray imaging only by moving the subject up and down (that is, moving in the slice width direction). Has been. In such DR imaging, the data from the X-ray detection unit for CT imaging is processed by an arithmetic device to obtain a transmission two-dimensional image, so that a heavy load is imposed on the arithmetic device and a considerable amount is required to obtain a transmission two-dimensional image. It takes time.

  X-ray CT apparatuses have generations according to scan methods. In the first and second generation X-ray CT apparatuses, an X-ray generator (for example, an X-ray tube) and an X-ray detector, which are opposed to each other with the subject interposed therebetween, are rotated around the subject by a predetermined angle ( Or rotation (rotating the subject itself) and the direction perpendicular to the straight line and the rotation axis connecting the X-ray tube and the X-ray detector (or the subject itself) to the X-ray tube and the X-ray detector. The subject is scanned alternately to obtain CT data by performing a translation operation (translation) for translating to the right and left. These first and second generation X-ray CT apparatuses may be referred to as “TR system”. The first generation X-ray CT apparatus uses one X-ray tube and one detector, whereas the second generation X-ray CT apparatus uses X-rays emitted from the X-ray tube as a fan beam. By arranging a plurality of detectors in the circumferential direction, it is possible to obtain data of a plurality of angles by one scan (translation operation), thereby increasing the rotation interval and shortening the data collection time. In the third generation X-ray CT apparatus, in order to further shorten the data collection time, the translation operation is eliminated and the data collection is performed only by the rotation operation. Although the third generation method requires complicated calculations such as correction of position information, the time required for the mechanical operation is greatly improved as compared with the first and second generation X-ray CT apparatuses. At present, the combination of this third generation method with helical motion is the mainstream. In the fourth generation X-ray CT apparatus, a large number (for example, 500 to 800) of X-ray detectors are fixedly arranged in an arc shape, and data is collected by rotating only the X-ray tube. The fourth generation X-ray CT apparatus is very expensive because it uses a large number of X-ray detectors.

  When the output of the X-ray tube is the same, the total amount of X-rays incident on the X-ray detector decreases in inverse proportion to the scanning speed. If the X-ray dose is reduced, it is more susceptible to noise, leading to image quality degradation. For this reason, the operating current of the X-ray tube is several mA in the first generation, whereas several hundred mA is required in the third generation in which scanning is performed at high speed, and accordingly a high voltage generator for the X-ray tube is required. And power supply facilities are also large and require high output.

  As described above, the third-generation X-ray CT apparatus can perform high-speed CT imaging, but the mechanism is complicated and a large-sized power supply is required, so that the apparatus is large and expensive. ing. In particular, the current X-ray CT apparatus requires AC200V, three-phase power supply equipment with a rated current of several tens of A, so it is necessary to expand the power supply equipment along with the introduction of the equipment, which causes further cost increase. Yes.

On the other hand, in recent years, the importance of pets such as dogs and cats as members of a family has increased, and there is an increasing demand for pets to perform diagnosis and treatment using a CT apparatus. However, as described above, the conventional CT apparatus is expensive to introduce, so it is difficult to introduce it to the vast majority of privately managed veterinary clinics, and it has been introduced only to some veterinary clinics such as university-attached veterinary clinics. It cannot respond to such a request sufficiently.
JP 2002-153457 A

  In order to simplify and reduce the price of the X-ray CT apparatus, it is conceivable to adopt the TR system, particularly the second generation system, at the expense of speeding up. However, in the second generation method, not only does CT imaging take time, but also DR imaging performed to determine the CT imaging site of the subject takes a lot of time. Therefore, the conventional second-generation X-ray CT apparatus has a long total inspection time and cannot be practically used for daily diagnosis work.

  The present invention is intended to solve the above-described problems, and a main object of the present invention is to provide an X-ray CT apparatus that can quickly determine a CT imaging region of a subject without requiring a long time for DR imaging. And

  In order to solve the above problems, an X-ray CT apparatus according to the present invention includes an X-ray generator that irradiates an X-ray toward a subject, and an X-ray detection that detects X-rays that have passed through the subject for CT imaging. Apparatus, processing device for processing signal from X-ray detection device to reconstruct cross-sectional image of subject, and X-ray imaging device for obtaining two-dimensional perspective image of subject from X-ray transmitted through subject And a display device for displaying a two-dimensional perspective image of the subject obtained by the X-ray imaging apparatus.

  According to the above configuration, the X-ray imaging apparatus that acquires the two-dimensional fluoroscopic image of the subject is provided separately from the X-ray detection apparatus for CT imaging, and the two-dimensional fluoroscopic image obtained by the X-ray imaging apparatus is displayed. Therefore, it is not necessary to perform DR imaging using an X-ray detection device, and the position of the subject is adjusted while observing the displayed two-dimensional fluoroscopic image, and the CT imaging portion of the subject is quickly determined. Total inspection time including positioning can be greatly shortened. In addition, since the calculation for DR shooting is unnecessary, the load on the calculation device is greatly reduced.

  The X-ray CT apparatus of the present invention preferably further includes a drive mechanism that selectively arranges the X-ray detection apparatus and the X-ray imaging apparatus at a position facing the X-ray generation apparatus.

  By having such a drive mechanism, the X-ray imaging device is placed at a position facing the X-ray generation device when positioning by looking at the two-dimensional transmission image, and the X-ray detection device is generated during CT imaging. The X-ray detection apparatus and the X-ray imaging apparatus can be prevented from interfering with each other by being arranged at a position facing the apparatus.

  Further, the X-ray generation apparatus emits X-rays generated when the X-ray detection apparatus is at a position facing the X-ray generation apparatus and when the X-ray imaging apparatus is at a position facing the X-ray generation apparatus. X-ray beam shaping means for changing the field can be provided. The X-ray beam shaping means may have a plate having a slit, for example. Thus, for example, in CT imaging using an X-ray detection device, the X-ray is a fan beam and the X-ray irradiation field is a thin straight line, or in the display of a two-dimensional perspective image using an X-ray imaging device, the X-ray is a cone beam. The X-ray irradiation field can be a suitable X-ray irradiation field.

  In a preferred embodiment, the X-ray CT apparatus of the present invention further includes image capture means for capturing a two-dimensional perspective image of a subject immediately before CT imaging as a still image, and a cross-sectional image obtained by CT imaging. At the same time, it is displayed on the display device. Thereby, the site | part of the subject which image | photographed the cross-sectional image can be confirmed easily.

  The X-ray CT apparatus of the present invention can also display a position (slice position) where a cross-sectional image is taken on a two-dimensional perspective image of a subject displayed on a display device. This makes it easier to determine the CT imaging region of the subject by adjusting the position of the subject while viewing the two-dimensional perspective image.

  The CT apparatus of the present invention has an X-ray imaging apparatus for obtaining a two-dimensional fluoroscopic image of a subject separately from the X-ray detection apparatus for CT imaging, and the two-dimensional fluoroscopic image obtained by the X-ray imaging apparatus is obtained. Since it is displayed on the display device, there is no need to perform DR imaging using an X-ray detection device, and the CT position of the subject is quickly determined by adjusting the position of the subject while viewing the displayed two-dimensional fluoroscopic image. In addition, the total inspection time including positioning can be greatly shortened.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram showing a schematic configuration of a preferred embodiment of an X-ray CT apparatus according to the present invention. The X-ray CT apparatus 100 includes an X-ray CT apparatus main body 150 and an operation console 200. The X-ray CT apparatus main body 150 includes an X-ray generation apparatus 1 that irradiates a subject with X-rays, an X-ray detection apparatus 2 that detects X-rays transmitted through the subject, an X-ray generation apparatus 1, and an X-ray It has a drive mechanism 4 including a motor for driving the detection device 2 and the like, and a control device 5 for controlling them. Furthermore, the X-ray CT apparatus main body 150 has an X-ray imaging apparatus 3 for obtaining a two-dimensional perspective image from X-rays transmitted through the subject.

  The operation console 200 processes the output signal of the X-ray detection apparatus 2 transmitted via the control device 5 and reconstructs the cross-sectional image of the subject, and calculates to display the obtained cross-sectional image. A monitor 202 connected to the apparatus and a remote operation device 203 connected to the control device 5 to operate the X-ray CT apparatus main body 150 are provided. The arithmetic device 201 and the monitor 202 can be composed of, for example, a notebook computer. An input device 204 such as a mouse or a keyboard is connected to the arithmetic device 201. The remote operation device 203 includes a switch for instructing the control device 5 of the X-ray CT apparatus main body 150 to move the subject.

  2 is a perspective view showing a preferred embodiment of the X-ray CT apparatus main body 150 of FIG. 1, FIG. 3 is a sectional view taken along line III-III of FIG. 2, and FIG. 4 is line IV-IV of FIG. FIG. As shown in FIGS. 3 and 4, the X-ray CT apparatus main body 150 has a mounting table 8 on which a subject 7 made of a small animal such as a dog or a cat is mounted. The apparatus 2 is disposed so as to face the subject 7. 3 and 4, the internal structures of the X-ray generator 1 and the X-ray detector 2 are not shown.

  As shown in FIGS. 2 to 4, the X-ray CT apparatus main body 150 includes a housing 11 formed by a bottom wall 12, a front cover member 13, a center cover member 14, and a back cover member 15. The X-ray generator 1, the X-ray detector 2, the control device 5, and the mounting table 8 are accommodated therein. The cover members 13, 14 and 15 are preferably made of fiber reinforced plastic (FRP). The front cover member 13 is provided with a door 16 so that an operator (for example, a veterinarian) can place the subject 7 on the mounting table 8 without entering the housing 11. The central cover member 14 is provided with an observation window 18 so that the state of the subject 7 in the housing 11 can be confirmed. A caster 19 is provided on the bottom surface of the housing 11 so that the X-ray CT apparatus main body 150 can be easily moved. The front cover 13 is provided with an operation panel 20 including a monitor and a switch for operating the X-ray CT apparatus main body 150, and all or a part of operations that can be performed on the external console 200 are also performed on the operation panel 20. Be able to.

  As shown in FIGS. 3 and 4, the housing 11 has a bottom wall 12 for supporting the X-ray generator 1 and the X-ray detector 2 so as to be rotatable around the mounting table 8 (or the subject 7). It has front and rear frame members 21 and 22 mounted and fixed on top. Each frame member 21, 22 is provided with openings 23, 24. Cylindrical rotating members 25, 26 are rotatably supported in these openings 23, 24 via bearings 27, 28. Flange portions 29 and 30 are provided at the rear end of the front rotation member 25 and the front end of the rear rotation member 26, and the rotation members 25 and 26 are connected to each other by a connecting member (not shown) that connects the flange portions 29 and 30. It can rotate integrally. The cylindrical portion of the rear rotating member 26 is coupled to the output shaft of the motor 32 controlled by the control device 5 via the belt 31.

  A first rail pair 33 and 34 and a second rail pair 35 and 36 are attached to the mutually opposing surfaces of the flange portions 29 and 30 of the rotating members 25 and 26, and move along the rails 33 to 36. Sliders 37 to 40 are provided as possible. The X-ray generator 1 is mounted between sliders 37 and 38 that are movable along the first rail pair 33 and 34, and the X-ray detector 2 is movable along the second rail pair 35 and 36. Between the sliders 39 and 40. Furthermore, motors 41 and 42 that are synchronously controlled by the control device 5 are attached to the rear frame member 22 as drive devices for linearly moving the sliders 38 and 40. The motors 41 and 42 have threaded output shafts 43 and 44 that pass through the corresponding sliders 38 and 40 and engage with the sliders 38 and 40 by a ball screw mechanism or the like. The sliders 38 and 40 can be moved along the rails 34 and 36 by rotating the motors 41 and 42. The sliders 37 and 39 are freely movable along the rails 33 and 35. Thus, the X-ray generator 1 and the X-ray detector 2 are translated by the rotation of the motors 41 and 42.

  Thus, in the present embodiment, the X-ray CT apparatus main body 150 obtains a cross-sectional image of the subject 7 by performing rotation and translation of the X-ray generator 1 and the X-ray detector 2. Therefore, it is configured as a T-R X-ray CT apparatus for acquiring data (CT data) for the purpose. The X-ray generator 1 has a plate 10 provided with a slit for making the emitted X-ray a fan beam, and the X-ray detector 2 has a plurality of X-ray detectors arranged in the circumferential direction. . That is, the X-ray CT apparatus main body 150 is a second generation X-ray CT apparatus. The plate 10 can be moved by a known drive mechanism (such as a motor) (not shown) controlled by the control device 5, and is removed from the X-ray path when it is not necessary to use the X-ray as a fan beam.

  The mounting table 8 is supported so as to be slidable in the horizontal direction in a cylindrical member 9 that passes through the cylindrical rotary members 25 and 26 in the horizontal direction and is held in the housing 11. The cylindrical member 9 is made of a transparent material such as acrylic so that the subject 7 inside can be visually recognized. The front end of the mounting table 8 is connected to the output shaft of the motor 46 controlled by the control device 5 by a cable 47 supported by a pulley 48, and the rear end is similarly motored by a cable 49 supported by a pulley 50 and the like. 46 is connected to the output shaft (part of the cable 49 is not shown). Thereby, the horizontal position of the mounting table 8 can be adjusted by the rotation of the motor 46. Thus, the subject 7 (mounting table 8) is moved relative to the slice position determined by the X-ray generator 1 and the X-ray detector 2 in the horizontal direction to adjust the CT imaging region of the subject 7. Can do. Although it is conceivable to move the X-ray generator 1 and the X-ray detector 2 in the horizontal direction instead of moving the mounting table 8, a power cable and a signal line are connected to these, and rotation and translation are also possible. Since it must be moved together with the drive mechanism for movement, it is difficult to move compared to the mounting table 8.

  In the present embodiment, lead plates 12a, 13a, 14a, 15a are formed on the bottom wall 12 and the inner surfaces of the cover members 13, 14, 15 constituting the housing 11 that supports and accommodates the X-ray generator 1 and the X-ray detector 2. Is lined, and X-rays emitted from the X-ray generator 1 can be shielded to prevent leakage to the outside of the housing 11. The door 16 is also lined with a lead plate 16a on the inner surface, and the window 18 is made of glass containing lead and also has an X-ray blocking ability. Thereby, X-rays can be shielded so that the outside of the X-ray CT apparatus 1 becomes a living area environment defined by laws and the like. The door 16 may be formed using lead-containing glass so that the inside can be observed.

  As shown in FIGS. 3 and 4, the X-ray imaging apparatus 3 is provided on the bottom wall 12 of the housing 11 so as to be movable in the horizontal direction. In FIG. 4, the X-ray imaging apparatus 3 is indicated by an imaginary line. The X-ray imaging apparatus 3 includes an X-ray image intensifier and a television camera (imaging device) such as a CCD. As is well known in the art, the main functions of an X-ray image intensifier are the conversion of X-rays into visible light, brightness multiplication, and image reduction, using an X-ray image intensifier. As a result, the sensitivity is greatly improved, and a two-dimensional perspective image (moving image) with a wide field of view can be easily obtained.

  The X-ray imaging apparatus 3 is installed on sliders 53 and 54 that can move along a pair of rails 51 and 52 provided in parallel on the bottom wall 12. One slider 53 passes through a threaded output shaft 56 of a motor 55 controlled by the control device 5 and engages with the slider 53 by a ball screw mechanism or the like. Can be adjusted. The other slider 54 can move freely along the rail 52. In this way, the position of the X-ray imaging apparatus 3 provided on the sliders 53 and 54 is adjusted between the retracted position indicated by the solid line and the operation position indicated by the imaginary line (position facing the X-ray generator 1) in FIG. It is possible to do.

  The X-ray detection apparatus 2 is attached to one end of a pair of arms 60 and 61, the other end of one arm 60 is rotatably attached to the slider 39, and the other end of the other arm 61 is attached to the slider 40. It is attached to the output shaft of the attached motor 62. The motor 62 is controlled by the control device 5, and by rotating the motor 62, the X-ray detection device 2 can be moved between the operation position indicated by the solid line in FIG. 4 and the retracted position indicated by the imaginary line. ing.

  FIG. 5 is a front view of the remote operation device 203 and shows an operation surface. The remote operation device 203 includes movement switches 210 and 211 for adjusting the position of the mounting table 8, voltage and current control knobs 212 and 213 for adjusting the output of the X-ray generator 1, and the open / closed state of the door 16. And a lamp 215 indicating that X-rays are emitted from the X-ray generator 1. When the movement switch 210 is pressed, the control device 5 drives the motor 46 to move the mounting table 8 in the left direction in FIG. 3, and when the movement switch 211 is pressed, the motor 46 is reversed to mount the mounting table 8. Is moved to the right in FIG.

  The operation of the X-ray CT apparatus 100 of the present invention configured as described above will be described below with reference to FIG. 6 showing an example of the display screen of the monitor 202. In the initial state, the X-ray imaging apparatus 3 is placed at a position (operation position) facing the X-ray generation apparatus 1 as indicated by an imaginary line in FIG. 3 and can receive X-rays transmitted through the subject 7. The X-ray detection apparatus 2 is moved to the position indicated by the imaginary line (retreat position) in FIG. 4 so that it does not interfere with the X-ray imaging apparatus 3 at the operating position.

  First, the subject 7 is placed on the mounting table 8 and inserted into the X-ray CT apparatus main body 150. Next, the movement switch 211 of the remote control device 202 is pressed to move the mounting table 8 and the subject 7 to the observation position between the X-ray generator 1 and the X-ray imaging device 3. Next, the fluoroscopic button (icon) 221 on the display screen of the monitor 202 is clicked with the mouse to instruct the control device 5 to start fluoroscopy. The control device 5 turns on the X-ray generator 1, and the X-ray generator 1 irradiates the subject 7 with X-rays. At this time, the control device 5 retracts the plate 10 having a slit for making the X-rays emitted from the X-ray generation device 1 into a fan beam at a position off the X-ray path, whereby the X-rays are cone beams. It becomes the shape of. A plate having a slit (or opening) of an appropriate shape other than the plate 10 may be arranged instead.

  X-rays transmitted through the subject 7 enter the X-ray imaging device 3, and an output from the X-ray imaging device 3 showing a two-dimensional perspective image of the subject 7 is sent to the arithmetic device 201 via the control device 5. The arithmetic unit 201 displays a two-dimensional perspective image of the subject 7 as a moving image on the perspective image display unit 223 of the monitor 202 based on the output of the sent X-ray imaging device 3. On the fluoroscopic image display unit 223, a line 224 indicating a slice position determined by the X-ray generator 1 and the X-ray detector 2 is displayed together. The position of the mounting table 8 is adjusted by operating the remote control device 203 while viewing the two-dimensional perspective image of the subject 7 displayed on the monitor 202 in this manner, and the desired position of the subject 7 is indicated by the line 224. To come to. When the positioning is completed, the fluoroscopic button 221 is clicked again to instruct the end of the fluoroscopic operation. The arithmetic unit 201 captures the image displayed on the perspective image display unit 223 at that time as a still image and displays it on the captured image display unit 225. That is, the arithmetic unit 201 functions as an image capture unit. The captured image displayed on the captured image display unit 225 also includes a line 224 indicating the slice position, and it can be easily determined whether or not a desired part of the subject 7 is on the slice position.

  After confirming the CT imaging region, the CT image collection button (icon) 222 on the display screen of the monitor 202 is clicked with the mouse to instruct the control device 5 to collect the CT image. The control device 5 drives the motor 55 to move the X-ray imaging device 3 to the retracted position shown by the solid line in FIG. 3, and drives the motor 62 to show the X-ray detection device 2 by the solid line in FIG. After moving to the operation position (ie, the position facing the X-ray generator 1), the motors 32, 41, 42 are driven to rotate and translate the X-ray generator 1 and the X-ray detector 2. The CT data is collected repeatedly. At this time, the control device 5 places the retracted plate 10 on the path of the X-rays emitted from the X-ray generator 1, and sets the X-rays irradiated toward the subject 7 to have a fan beam shape.

  The output from the X-ray detection device 2 is sent to the arithmetic device 201 via the control device 5 for processing, and a cross-sectional image is reconstructed. The reconstructed cross-sectional image is displayed on the cross-sectional image display unit 226 on the display screen of the monitor 202.

  As described above, the X-ray CT apparatus 100 of the present invention has the X-ray imaging apparatus 3 for obtaining a transmission two-dimensional image of the subject 7 separately from the X-ray detection apparatus 2 for collecting CT data. Since the position of the subject 7 can be adjusted while observing the transmission two-dimensional image obtained by the apparatus 3, the CT imaging region is determined even in the second generation X-ray CT apparatus having a simple configuration and low cost. Therefore, it is possible to greatly reduce the total inspection time required for X-ray CT imaging without taking much time for DR imaging.

  As mentioned above, although this invention was demonstrated in detail based on the Example, these Examples are an illustration to the last and this invention is not limited by an Example. It goes without saying that those skilled in the art can make various modifications or changes without departing from the technical idea of the present invention defined by the claims. For example, in the above embodiment, both the two-dimensional perspective image and the cross-sectional image are displayed on the monitor 202, but a monitor dedicated to the two-dimensional perspective image may be provided separately.

  As described above, the present invention is applied to an X-ray CT apparatus, particularly a second-generation X-ray CT apparatus, and DR structure for determining a cross-sectional image acquisition position does not require much time, and has a structure. A simple and inexpensive X-ray CT apparatus can be provided.

The block diagram which shows the structure of the suitable Example of the X-ray CT apparatus based on this invention. The perspective view which shows the suitable Example of a X-ray CT apparatus main body. FIG. 3 is a schematic cross-sectional view taken along line III-III in FIG. 2. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3. The front view of the remote control apparatus of FIG. The schematic diagram which shows the suitable Example of the display screen of the monitor of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 X-ray generator 2 X-ray detector 3 X-ray imaging device 4 Drive mechanism 5 Control apparatus 7 Subject 8 Mounting base 9 Cylindrical member 10 Plate with slit 11 Housing 12 Bottom wall 13 Front cover member 14 Central cover member 15 Back surface Cover member 16 Door 12a-16a Lead plate 18 Observation window 19 Caster 20 Operation panel 21, 22 Front and rear frame members 23, 24 Opening 25, 26 Rotating member 27, 28 Bearing 29, 30 Flange portion 31 Belt 32 Motor 33- 36 Rail 37 to 40 Slider 41, 42 Motor 43, 44 Output shaft 46 Motor 47 Cable 48 Pulley 50 Pulley 51, 52 Rail 53, 54 Slider 55 Motor 56 Output shaft 60, 61 Arm 62 Motor 100 X-ray CT device 150 X-ray CT apparatus main body 200 Operation console 201 Arithmetic apparatus 02 Monitor 203 Remote control device 204 Input device 210, 211 Movement switch 212, 213 Voltage and current control knob 214, 215 Lamp 221 Fluoroscopic button 222 CT image acquisition button 223 Fluoroscopic image display unit 224 Line 225 indicating the position of obtaining the cross-sectional image Captured image Display unit 226 Cross-sectional image display unit

Claims (4)

An X-ray CT apparatus for obtaining a cross-sectional image of a subject,
An X-ray generator that irradiates the subject with X-rays;
An X-ray detector for detecting X-rays transmitted through the subject for CT imaging;
An arithmetic unit that processes a signal from the X-ray detection device to reconstruct a cross-sectional image of the subject;
An X-ray imaging apparatus for obtaining a two-dimensional perspective image of the subject from X-rays transmitted through the subject;
A display device for displaying a two-dimensional perspective image of the subject obtained by the X-ray imaging device;
Image capturing means for capturing the two-dimensional perspective image of the subject displayed on the display device immediately before CT imaging as a still image, and displaying the still image together with the cross-sectional image obtained by CT imaging An X-ray CT apparatus characterized by being displayed on the apparatus. The X-ray CT apparatus according to claim 1, wherein a position at which a cross-sectional image is taken is also displayed on a two-dimensional perspective image of the subject displayed on the display device. The X-ray CT apparatus according to claim 1 , further comprising a drive mechanism that selectively arranges the X-ray detection apparatus and the X-ray imaging apparatus at a position facing the X-ray generation apparatus. . X-rays generated when the X-ray generation device is located at a position where the X-ray detection device faces the X-ray generation device and when the X-ray imaging device is located at a position facing the X-ray generation device The X-ray CT apparatus according to claim 3, further comprising an X-ray beam shaping unit for changing an irradiation field of the line.

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