JP5269233B2 - X-ray diagnostic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an image display device capable of displaying images in such a way that three-dimensional geometric relationships can be clearly recognized and particularly in such a way that a relationship between a vascular cross-sectional image and a vascular projected image can be easily recognized, an image display method, an X-ray diagnostic therapeutic apparatus, and a method for displaying the images. <P>SOLUTION: The cross-sectional image and the projected image are created by an image creating section 16 from volume data obtained by a CT volume data obtaining section 11. Then, the direction of projection in a radiation direction on the cross-sectional image created by the image creating section 16 is calculated by an arithmetic operation section 15. The created cross-sectional image and projected image are displayed on a monitor 36 via a display control section 19. When a specific point on the cross-sectional image displayed on the monitor 36 is designated by an operation section 13, the projected image as seen from the designated specific point, is displayed on the monitor 36. <P>COPYRIGHT: (C)2013,JPO&amp;INPIT

Description

The present invention relates to an X-ray diagnostic apparatus , and more particularly to an improvement in a method for determining an observation direction during endovascular treatment.

  Conventionally, a treatment method called endovascular treatment is known. In this treatment method, a device such as a guide wire (hereinafter referred to as a wire) or a catheter is inserted into a blood vessel to proceed, and the affected part is treated with the device. Because it is obtained, it is a healing method that has been rapidly expanding in recent years. When formulating a treatment plan for this treatment, it will be mainstream to use CT images in the future.

  A CT image is a volume (CT) that is acquired and reconstructed by a CT (Computed Tomography) device that collects 360-degree X-ray projection images around the human body, reconstructs them, and reconstructs them into two-dimensional tomographic images. 3D) data. The volume data is very convenient because a blood vessel cross-sectional image can be observed.

  For example, in the treatment of scraping plaque present in the blood vessel, the operator creates a blood vessel cross-sectional image from CT volume data, observes the direction of plaque attachment and the amount of plaque in the blood vessel cross-sectional image, and how much on which side of the blood vessel It is very convenient because you can see if you want to cut. As a known document, for example, there is the following non-patent document 1.

Morton J.M. Kern, “Cardiac Catheter Handbook” Medical School

  When an operator who has made a treatment plan using the aforementioned blood vessel cross-sectional image enters the catheter room for actual treatment, the image obtained in real time by the X-ray imaging system in the catheter room is not a blood vessel cross-sectional image but a blood vessel projection image. It is. For this reason, the surgeon converts the three-dimensional geometric positional relationship between the cross-sectional image at the time of planning and the currently visible projection image in his / her head, and is displayed in front of the eyes from the planned blood vessel cross-sectional image. It is necessary to convert the treatment plan into a blood vessel projection image.

  However, such conversion in the head is painful, especially for young surgeons, and there is a risk of getting lost or mistaken.

Accordingly, the present invention has been made in view of the above circumstances, and makes it easy to understand the three-dimensional geometric positional relationship, and in particular, X-rays that can be displayed with the relationship between a blood vessel cross-sectional image and a blood vessel projection image being easily understood. An object is to provide a diagnostic apparatus .

An X-ray diagnostic apparatus according to an embodiment includes an X-ray source and an X-ray detector that are opposed to each other by a supporter with a subject interposed therebetween, and detects X-rays irradiated on the subject from the X-ray source. In an X-ray diagnostic apparatus for displaying an image based on image data converted into an electrical signal, volume data acquisition means for acquiring volume data, and a cross-sectional image is created from the volume data acquired by the volume data acquisition means A cross-sectional image creating means, a calculating means for calculating a projection direction of the X-ray diagnostic apparatus in each of a plurality of radiation directions based on a specific point on the cross-sectional image, and a plurality of the calculated projection directions. And a support control means for rotating the support to position the X-ray source in a selected desired projection direction .

  The image display device of the present invention includes volume data acquisition means for acquiring volume data, cross-sectional image generation means for generating a cross-sectional image from the volume data acquired by the volume data acquisition means, and the cross-sectional image generation means. A calculation unit that calculates a projection direction of a radial direction on the generated cross-sectional image, a projection image generation unit that generates a projection image from the volume data acquired by the volume data acquisition unit, and the cross-sectional image and the projection image Display means for displaying, and designation means for designating a specific point on the cross-sectional image displayed on the display means, wherein the display means is a direction of the specific point designated by the designation means It is characterized by displaying a projected image viewed from the above.

  Furthermore, the X-ray diagnosis and treatment apparatus of the present invention has an X-ray source and an X-ray detector that are arranged opposite to each other with a support across the subject, and the X-ray irradiated to the subject from the X-ray source In an X-ray diagnostic treatment apparatus that displays an image by performing image processing on image data that has been detected and converted into an electrical signal, volume data acquisition means for acquiring volume data, and acquisition by the volume data acquisition means Acquired by the volume data acquisition unit, a cross-sectional image generation unit that generates a cross-sectional image from the volume data obtained, a calculation unit that calculates a projection direction of a radial direction on the cross-sectional image generated by the cross-sectional image generation unit, and A projection image creating means for creating a projection image from the volume data, a display means for displaying the cross-sectional image and the projection image, and the cross-sectional image displayed on the display means. Designating means for designating a fixed point, and when the specific means is designated by the designation means, the calculating means is arranged so that the X-ray source is positioned in the direction of the designated specific point. The movement destination position of the support is calculated.

  The image display device of the present invention is acquired by a volume data acquisition unit that acquires volume data, a cross-sectional image generation unit that generates a cross-sectional image from the volume data acquired by the volume data acquisition unit, and the volume data acquisition unit. Projection image creation means for creating a projection image from the obtained volume data, display means for displaying the cross-sectional image and the projection image, image rotation means for rotating the projection image in a desired direction, and Calculating means for calculating a projection direction, wherein the display means displays the projection direction calculated by the calculation means on the cross-sectional image.

  The X-ray diagnosis and treatment apparatus of the present invention has an X-ray source and an X-ray detector that are arranged opposite to each other with a support across the subject, and detects X-rays irradiated on the subject from the X-ray source. In an X-ray diagnostic treatment apparatus that performs image processing on image data converted into an electrical signal and displays an image, the volume data acquisition means for acquiring volume data and the volume data acquisition means Cross-sectional image creation means for creating a cross-sectional image from volume data, projection image creation means for creating a projection image from the volume data acquired by the volume data acquisition means, display means for displaying the cross-sectional image and the projection image, Image rotation means for rotating the projection image in a desired direction; and calculation means for calculating a projection direction of the rotated projection image. Projection direction calculated in unit output, and displaying on said cross-sectional image.

  The image display method of the present invention includes a first step of acquiring volume data, a second step of creating a cross-sectional image from the volume data acquired in the first step, and the second step. A third step of calculating a radial projection direction on the created cross-sectional image; a fourth step of creating a projection image from the volume data acquired in the first step; and the cross-sectional image and the projection And a fifth step of displaying an image on a monitor.

  The image display method of the present invention is created in the first step of acquiring volume data, the second step of creating a cross-sectional image from the volume data acquired in the first step, and the second step. A third step of calculating a radial projection direction on the cross-sectional image, a fourth step of creating a projection image from the volume data acquired in the first step, and the cross-sectional image and the projection image. A fifth step of displaying on the monitor, a sixth step of specifying a specific point on the cross-sectional image displayed on the monitor, and a direction of the specific point specified in the sixth step And a seventh step of displaying a projected image on a monitor.

  Furthermore, the image display method of the X-ray diagnosis and treatment apparatus of the present invention includes an X-ray source and an X-ray detector which are arranged opposite to each other with a support across the subject, and the subject is irradiated from the X-ray source. In an image display method of an X-ray diagnostic treatment apparatus for displaying an image by performing image processing on image data converted into an electrical signal by detecting a detected X-ray, a first step of acquiring volume data; A second step of creating a cross-sectional image from the volume data acquired in the first step, and a third step of calculating a radial projection direction on the cross-sectional image generated in the second step A fourth step of creating a projection image from the volume data acquired in the first step, a fifth step of displaying the cross-sectional image and the projection image on a monitor, and the cross-section displayed on the monitor A sixth step of designating a specific point on the image; and when a specific point is designated in the sixth step, the X-ray source is positioned in the direction of the designated specific point. And a seventh step of calculating a movement destination position of the support device.

ADVANTAGE OF THE INVENTION According to this invention, the X-ray diagnostic apparatus which makes it easy to understand a three-dimensional geometric positional relationship, and can display especially the relationship between a blood vessel cross-sectional image and a blood vessel projection image can be provided.

1 is a block diagram illustrating a configuration of an image display device according to a first embodiment of the present invention. 3 is a flowchart for explaining an operation of the image display apparatus in the first embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is for demonstrating operation | movement of the image display apparatus in the 1st Embodiment of this invention, (a) is the figure which showed the example of CT apparatus, (b) is the figure which showed the example of volume data, (C) is the figure which showed the example of the blood vessel cross-sectional image. It is explanatory drawing for calculating a projection direction on the blood vessel cross-sectional image. It is a figure for demonstrating conversion of a coordinate system. It is explanatory drawing for calculating a projection direction about all the directions. It is the figure which showed the example which displayed the projection direction of the radial direction on a cross-sectional image. It is a figure for demonstrating creation of a projection image. It is the figure which showed the example which displayed the blood vessel cross-sectional image and projection image of the image display apparatus in the 1st Embodiment of this invention. It is the figure which shows the modification of the 1st Embodiment of this invention, and showed the example which rotated and displayed the arrow showing a radiation direction. It is a figure which shows the modification of the 1st Embodiment of this invention, and showed the example which rotated the cross-sectional image and displayed the arrow showing a radiation direction. It is a flowchart for demonstrating operation | movement of the image display apparatus in the 2nd Embodiment of this invention. It is the figure which showed the example which displayed the blood vessel cross-sectional image and the projection image of the image display apparatus in the 2nd Embodiment of this invention. It is a figure which shows the modification of the 2nd Embodiment of this invention, and showed the example of the display method of a cross-sectional image.

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

(First embodiment)
FIG. 1 is a block diagram showing a configuration of an image display apparatus according to the first embodiment of the present invention.

  In FIG. 1, an image display apparatus 10 includes a CT volume data acquisition unit 11, a system control unit 12, an operation unit 13, an image storage unit 14, a calculation unit 15, an image creation unit 16, and a storage unit. 17, a display control unit 19, a support device control unit 20, a captured image acquisition unit 21, and a projection angle information input unit 22.

  The CT volume data acquisition unit 11 is for acquiring desired CT volume data from the CT apparatus 1. The system control unit 12 controls the overall control operation of the image display apparatus 20. The operation unit 13 is used to perform an operation for clicking a wire plan line on a blood vessel cross section, an image selection, and the like, and includes a control panel or the like.

  The image storage unit 14 is a storage unit that stores the image. The calculation unit 15 is for performing various calculations such as calculating a curve in the 3D image. The image creation unit 16 creates an image to be displayed on the monitor 36 described later together with the image storage unit 14. The storage unit 17 is for storing information on the X-ray projection direction of the X-ray diagnostic treatment apparatus 30 described later.

  The display control unit 19 displays the cross-sectional image of the 3D image created by the image storage unit 14 and the image creation unit 16 on the monitor 36. The support controller 20 is for controlling the position and angle of the C-arm 33 of the X-ray diagnostic treatment apparatus 30 described later. The projection image acquisition unit 21 is means for acquiring projection image data from an X-ray detector 35 described later, and the projection angle information input unit 22 is based on position information from a 3D position detection device 38 described later. This is for acquiring projection angle information of the X-ray source.

  An X-ray diagnosis and treatment apparatus 30 includes a bed 31 on which a patient (subject) K is placed, a gantry 32, and a C-arm that is supported by the gantry 32 and can rotate in the direction of an arrow R about the illustrated P axis. 33, an X-ray source 34 provided at one end of the C arm 33, an X-ray detector 35 provided at the other end of the C arm 33, and a monitor 36 for displaying a generated image. And a 3D position detection device 38 for detecting the position of an instrument such as a catheter inserted into the body of the patient K, and the image display device described above.

  The bed 31 is movable in the vertical direction and the horizontal direction, whereby the patient K is appropriately disposed between the X-ray source 34 and the X-ray detector 35.

  The C-arm 33 has a structure in which an X-ray source 34 and an X-ray detector 35 are arranged opposite to each other and held. Although not shown, the X-ray source 34 has an X-ray tube that irradiates the patient K with X-rays and a collimator that collimates the X-rays irradiated from the X-ray tube. On the other hand, the X-ray detector 35 is, for example, I.D. I. (Image intensifier) and an optical system. I. The X-ray information transmitted through the patient K is converted into optical information, and this optical information is collected by the optical lens by the optical system. I.I. I. An X-ray flat panel detector may be used as a detection device other than the above.

  The monitor 36 displays a 3D image or the like output via the display control unit 19 on the screen.

  Next, the operation of the image display apparatus according to the first embodiment of the present invention will be described with reference to the flowchart of FIG.

  First, in step S1, a blood vessel cross-sectional image is created from the CT volume data acquired by the CT volume data acquisition unit 11 from the CT apparatus 1. That is, volume data 45 as shown in FIG. 3B is obtained from the CT apparatus 1 shown in FIG. Then, the blood vessel center line 47 in the blood vessel 46 is extracted from the volume data 45 by the system control unit 12. Next, an MPR image perpendicular to the blood vessel center line 47 is created, and this becomes a blood vessel cross-sectional image 48 as shown in FIG.

  Next, in step S2, the projection direction on the blood vessel cross-sectional image is calculated. For example, as shown in FIG. 4A, a point A on the blood vessel cross-sectional image 48 is designated. A point B serving as a blood vessel center line on the blood vessel cross-sectional image 48 is obtained. Therefore, a straight line AB can be obtained from the points A and B. The straight line AB is a two-dimensional straight line on the cross-sectional image, but since the point A and the point B each have three-dimensional coordinates, the straight line AB can be obtained as a straight line in the three-dimensional space.

  Next, as shown in FIG. 4B, a straight line parallel to the straight line AB and passing through the center point C of the volume data 45 is calculated. Furthermore, based on the set SOD (distance between the subject and the X-ray source; Source-Object-Distance), a point D serving as a virtual X-ray source is obtained. Here, the inclination of the straight line AB and the straight line CD is the projection direction.

  In step S3, the coordinate system is converted. In general, volume data often uses a three-dimensional coordinate system such as X, Y, and Z. On the other hand, the coordinate system conventionally used in the X-ray system is often expressed as an LAO / RAO or CRA / CAU system with the support center as zero, as shown in FIG. The relationship between the two can be uniquely converted by assuming that the volume data center and the support center are zero. As a result, the straight line obtained in step S2 can be expressed in the LAO / RAO, CRA / CAU system.

  Further, in step S4, it is determined whether or not the processing has been performed for all directions on the cross-sectional image. Here, it may be performed every predetermined angle (for example, 30 degrees) or the like, and when it has not been performed for the angles in all directions yet, the process proceeds to step S5, as shown in FIG. The section S is shifted in the next projection direction. Thereafter, the process proceeds to step S2, and the processes of steps S2 to S4 are repeated.

  If the projection direction is calculated in all directions in this way, the process proceeds to step S6, and the projection direction in the radial direction on the cross-sectional image 55 is displayed as shown in FIG. In the figure, the numbers shown after LAO, RAO, CRA, and CAU represent the respective angles.

  Next, a projection image is created in step S7. As shown in FIG. 8, a CT volume image 45 viewed from a point D that is a virtual X-ray source is created as a projection image 56 that is a two-dimensional image. Thereafter, in step S8, the blood vessel cross-sectional image and the blood vessel projection image are displayed side by side on the monitor 36. For example, as shown in FIG. 8, in addition to the CT blood vessel cross-sectional image 57a and the CT projection image 57b, two or more images such as an X-ray contrast image 57c and an X-ray fluoroscopic image 57d are displayed. Anyway. The monitor 36 also displays a mini-image 54 of the X-ray diagnostic treatment apparatus showing the projection direction along with the cross-sectional image 55.

  In step S9, as shown in FIG. 9, when a certain radiation direction (for example, LAO40, CRA0) on the blood vessel cross-sectional image 58a is clicked on the operation unit 13, the angle is selected. This click is performed by a mouse, a keyboard, a touch panel or the like in the operation unit 13. Subsequently, in step S10, a CT projection image rotated by the image creation unit 16 is created so as to be a projection image viewed from the selected direction, and the projection image 58b viewed from the direction is displayed on the monitor 36. Is displayed.

  Here, if the projection direction of the projection image displayed on the monitor 36 is acceptable, the process proceeds from step S11 to step S12. If not, the process proceeds to step S9 and the above-described processing operation is repeated.

  In step S <b> 12, information on the projection direction is sent to the support controller 20 from the aforementioned angle. At the same time, projection angle information for the projection direction is temporarily stored in the storage unit 17. In step S13, when the operator operates an operation button (not shown) in the operation unit 13, the C arm 33 rotates via the support device control unit 20 according to the angle stored in the storage unit 17. .

  As described above, according to the first embodiment, the blood vessel cross-sectional image 58a and the projection image 58b are displayed side by side, and when the user clicks on the cross-sectional image, the projection image in that direction is displayed. Becomes easier to understand. As a result, when a plaque is present on the blood vessel wall, it becomes easier to see from which direction the projected image becomes easier to see.

  Next, a modification of the first embodiment of the present invention will be described.

  In the first embodiment described above, when the radial direction is clicked on the cross-sectional image, the projected image in that direction is rotated and displayed on the monitor.

  In this modified example, clicking on a cross-sectional image displays a projected image in that direction.

  That is, volume data from which blood vessel center coordinates have been extracted is used as the volume data. In an actual clinical situation, since the surgeon traces the blood vessel center line after CT imaging, the blood vessel center line data may be used as it is. Further, if the volume data is data from which the blood vessel center line has not been extracted, two specific points may be clicked on the cross-sectional image.

  As a display method of the radial direction, if the angle exceeds the rotation movable range of the C-arm 33, a color different from other angles, for example, a rotatable movable range is displayed in white, and an angle exceeding the rotation movable range is displayed in red. To do. Alternatively, there is a method in which the display itself is not performed if the angle exceeds the rotational movable range of the C-arm 33.

  Further, the radiation direction designation interface (operation unit 13) does not necessarily have to be displayed in a radiation pattern as shown in FIG. For example, as shown in FIG. 10A, the blood vessel 61 may be displayed in a combination of a circle mark 63 and an arrow 64. On the cross-sectional image 60, if the arrow 64 is moved in the direction desired by the operator (for example, the position shown in FIG. 10B) by dragging the mouse on the operation unit 13, for example, a projection image corresponding to this. Can be displayed.

  Also, as shown in FIGS. 10 (a) and 10 (b), instead of rotating the arrow 64 indicating the radiation direction, the arrow 64 is fixed as shown in FIGS. 11 (a) and 11 (b). The cross-sectional image itself may be rotated and displayed. In this case, the specific position of the cross-sectional image is moved by dragging with the mouse or the like of the operation unit 13.

  Note that the created projection image is one of VR, MIP, Ray sum, or a projection image of slice data of a specific blood vessel.

(Second Embodiment)
Next, a second embodiment of the present invention will be described.

  In the first embodiment described above, clicking on a cross-sectional image displays a projected image in that direction. In the second embodiment, when the projection image is rotated, a line in that direction is drawn in the cross-sectional image.

  FIG. 12 is a flowchart for explaining the operation of the image display apparatus in the second embodiment of the present invention.

  First, in step S <b> 21, a blood vessel cross-sectional image is created from the CT volume data acquired by the CT volume data acquisition unit 11 from the CT apparatus 1. In step S22, a projection image is created from the CT volume data, and in step S23, the projection image is rotated in the direction desired by the operator. These steps S22 and S23 are the same as the display of a general CT image.

  Next, in step S24, the projection direction is calculated on the blood vessel cross-sectional image. This is the same as the processing operation of step S2 in the flowchart of FIG. In the second embodiment, since the projection direction is determined first, the straight line CD shown in FIG. 4B is determined first. A straight line AB parallel to the straight line CD and passing through the point B is calculated. However, in the second embodiment, the straight line AB is rarely a line on the cross-sectional image, and is often a straight line that intersects the cross-section S. In this case, a straight line AB ′ obtained by dropping the straight line AB into the cross section S is calculated.

  In step S25, as shown in FIG. 13, a line (blood vessel center line) 73 is drawn on the blood vessel cross-sectional image 70a. In the figure, 71 represents a blood vessel, and 72 represents a projection direction. Thereafter, in step S26, the blood vessel cross-sectional image 70a and the blood vessel projection image 70b are displayed side by side on the monitor 36.

  Thus, also in the second embodiment, the relationship between the blood vessel cross-sectional image and the blood vessel projection image can be displayed in an easy-to-understand manner.

  Next, a modification of the second embodiment of the present invention will be described.

  In the second embodiment described above, when the projection image is rotated, a line in that direction is drawn on the cross-sectional image.

  However, the direction may be expressed in addition to drawing a line on the cross-sectional image.

  For example, instead of drawing a line on the cross-sectional image, an arrow may be drawn as shown in FIGS. 10 (a) and 10 (b). Alternatively, instead of drawing a line on the cross-sectional image, the cross-sectional image may be rotated as shown in FIGS.

  Alternatively, instead of drawing a line on the cross-sectional image, a three-dimensional arrow may be drawn as shown in FIG. Furthermore, instead of drawing a line on the cross-sectional image, the cross-sectional image itself may be displayed three-dimensionally as shown in FIG.

  In the first and second embodiments described above, the volume data of the cardiovascular by CT has been described as an example. However, the present invention is not limited to the heart and can be applied to any blood vessel in the whole body. is there. The present invention is not limited to blood vessels, and can be applied to any luminal organ.

  Furthermore, the present invention is not limited to CT volume data, but can also be applied to volume data obtained by an X-ray diagnostic apparatus, and in particular, volume data of an X-ray diagnostic apparatus can be created during treatment. Often better than volume data.

  Furthermore, the present invention is not limited to CT volume data, but can be applied to any 3D data such as MRI, PET, and the like.

  Although the embodiments of the present invention have been described above, the present invention can be variously modified without departing from the gist of the present invention other than the above-described embodiments.

  Further, the above-described embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and the effect described in the column of the effect of the invention Can be extracted as an invention.

  DESCRIPTION OF SYMBOLS 1 ... CT apparatus, 10 ... Image display apparatus, 11 ... CT volume data acquisition part, 12 ... System control part, 13 ... Operation part, 14 ... Image memory | storage part, 15 ... Calculation part, 16 ... Image creation part, 17 ... Memory | storage , 19 ... display control unit, 20 ... support device control unit, 21 ... projection image acquisition unit, 22 ... projection angle information input unit, 30 ... X-ray diagnostic treatment apparatus, 31 ... bed, 32 ... gantry, 33 ... C arm 34 ... X-ray source, 35 ... X-ray detector, 36 ... monitor, 38 ... 3D position detection device, 45 ... volume data, 46 ... blood vessel, 47 ... blood vessel center line, 48 ... blood vessel cross-sectional image, 56 ... projection image .

Claims (9)

Based on image data that has an X-ray source and an X-ray detector arranged opposite to each other with a support sandwiching the subject, and detects X-rays irradiated to the subject from the X-ray source and converted into an electrical signal In an X-ray diagnostic apparatus that displays an image,
Volume data acquisition means for acquiring volume data;
A cross-sectional image creating means for creating a cross-sectional image from the volume data acquired by the volume data acquiring means;
Calculating means for calculating a projection direction of the X-ray diagnostic apparatus in each of a plurality of radiation directions with a specific point on the cross-sectional image as a reference;
Supporter control means for rotating the supporter to position the X-ray source in a desired projection direction selected from the plurality of calculated projection directions;
X-ray diagnostic apparatus characterized by comprising a.   A projection image creating means for creating a projection image related to the selected predetermined projection direction using the volume data;
  Display means for displaying the projection image and the cross-sectional image that clearly indicates the selected predetermined projection direction in correspondence with the radiation direction;
  The X-ray diagnostic apparatus according to claim 1, further comprising:   The display means displays the cross-sectional image that clearly indicates the calculated plurality of projection directions corresponding to the radial directions,
  Further comprising selection means for selecting the desired projection direction from among the plurality of projection directions via a cross-sectional image that clearly indicates the plurality of projection directions corresponding to the respective radiation directions;
  The X-ray diagnostic apparatus according to claim 2. The display means, X-rays diagnostic apparatus according to claim 2 or 3, wherein the to clarify the relationship between the rotatable range of the support unit and the plurality of projection directions on the sectional image. X-ray diagnostic apparatus according to any one of claims 1 to 4, further comprising a designating means for designating a specific point on the cross-sectional image. Further comprising changing means for changing the projection direction of the displayed projection image;
The projection image creating means creates a projection image related to the changed projection direction,
The calculating means calculates a radiation direction corresponding to the changed projection direction;
The display means clearly indicates a radiation direction corresponding to the changed projection direction on the cross-sectional image;
The X-ray diagnostic apparatus according to claim 2 . The X-ray diagnostic apparatus according to claim 6, wherein the support unit control unit rotates the support unit so as to position the X-ray source in the changed projection direction . The X-ray diagnostic apparatus according to claim 6, wherein the display unit clearly indicates a radiation direction corresponding to the changed projection direction by a line on the cross-sectional image . The X-ray diagnostic apparatus according to claim 6, wherein the display unit clearly indicates a radiation direction corresponding to the changed projection direction by an arrow on the cross-sectional image .

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