JP5366492B2 - X-ray diagnostic equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an X-ray diagnostic apparatus for generating three-dimensional images corresponding to respective virtual light sources by moving the virtual light sources along a prescribed pathway. <P>SOLUTION: The X-ray diagnostic apparatus includes a projection data generating means 004 for generating projection databased on transmitting X rays; a reconstruction means for generating volume data by restructuring the projection databased on an input viewpoint and the coordinates of the virtual light sources; and a rendering means 006 for generating the three-dimensional images by means of volume rendering. The X-ray diagnostic apparatus further includes a light source position generating means 007 for generating the coordinates of the virtual light sources. The reconstruction means 005 generates volume data for respective coordinates of the virtual light sources by reconstructing the projection data based on the input viewpoint and the generated coordinates of the respective virtual light sources. The rendering means 006 generates the three-dimensional images by the volume rendering of the volume data. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to an X-ray diagnostic apparatus that generates a three-dimensional medical image by volume rendering.

  In medical image diagnostic apparatuses such as an ultrasonic image diagnostic apparatus, an X-ray CT apparatus, and an MRI, a three-dimensional image that describes a subject in three dimensions is generated. When a three-dimensional image is used, an operator such as a doctor can easily grasp the subject three-dimensionally and can perform a more accurate diagnosis. As one of the three-dimensional image drawing methods, a drawing method called volume rendering is used.

  Volume rendering is based on volume data that is obtained by scanning a subject and is not subjected to image processing. Light is applied from a light source to an object in a three-dimensional space, and the reflected light is observed from a viewpoint. In this drawing method, an image, that is, volume data is converted into data representing a density and density distribution in a space and drawn as a three-dimensional image. Volume rendering is a drawing method that is easy to recognize the surface of the drawn object and has a good structure because it can represent the change in reflected light due to the gradient of the object when drawing. Here, the “light source” and “reflected light” are in a virtual space, and are not actual ones. Hereinafter, this light source is referred to as a “virtual light source”.

  For example, in the case of an X-ray diagnostic apparatus, first, the X-ray diagnostic apparatus uses the reflection of X-rays to generate volume data composed of a set of voxels constituting the target space. The X-ray diagnostic apparatus stores volume data.

  Next, in response to an input from the operator, the direction of the viewpoint for observing the volume data in volume rendering and the direction of the virtual light source are set.

  Next, the X-ray diagnostic apparatus searches the end point of the voxel range to be rendered based on the direction of the line of sight and the direction of the virtual light source in the rendering processing unit. The rendering processing unit sequentially processes the voxels along the line of sight to calculate the pixel value of the three-dimensional image.

  This calculation will be specifically described. First, the rendering processing unit calculates a projected image of volume data on a plane orthogonal to the viewing direction, and sets a plurality of perspective lines along the viewing direction so as to pass through each pixel of the projected image.

  Next, the rendering processing unit samples the voxel value along each perspective line. Then, the rendering processing unit adds the transparency α (i) at the i-th sample point, and ends the sampling point when the sum becomes 1 or when the voxel lattice disappears. Hereinafter, the case where the end point is reached at a sampling point of i = m will be described.

  Next, the rendering processing unit calculates the luminance that is the output at each sampling point by the following equation. This luminance is a pixel value.

C (0) = 0
C (i) = (1−α (i)) · C (i−1) + α (i) · e _i
i = 1, 2,..., m−1.
C (i): Output from i-th voxel sampling point α (i): Opacity of i-th sampling point (0 ≦ α ≦ 1)
e _i : voxel value of the i th sampling point

  The luminance calculation described above is performed along all the set perspective lines, and the pixel value in each pixel of the projected image is calculated. By drawing each pixel based on the calculated pixel value, a three-dimensional image of volume data can be drawn.

  In particular, in an X-ray diagnostic apparatus, since a captured image is a two-dimensional image, it is effective to make a diagnosis while comparing it with a three-dimensional image formed by a volume continuous rig.

JP 2001-59872 A

  According to the conventional technology, a three-dimensional image obtained by performing volume rendering with a fixed virtual light source is obtained, and the three-dimensional structure of the subject can be grasped. Further, it has been performed to change the viewpoint without changing the position of the virtual light source. However, if the viewpoint is changed, it is necessary to recognize from which viewpoint. In addition, when the viewpoint is changed, only the three-dimensional image by volume rendering changes in direction when the X-ray diagnostic apparatus superimposes the two-dimensional image on the X-ray, and the two-dimensional image and the three-dimensional image are changed. It becomes difficult to make a comparison, and it is difficult to grasp three-dimensionally. Here, the virtual light source is a virtual light source that is a source of light that corresponds to volume data for calculating reflected light in performing volume rendering.

  The present invention has been made in view of such circumstances, and moves a virtual light source along a desired path for X-ray diagnosis to generate a three-dimensional image corresponding to each of a plurality of virtual light sources. An object of the present invention is to provide an X-ray diagnostic apparatus capable of observing a dimensional image almost simultaneously.

  In order to achieve the above object, an X-ray diagnostic apparatus according to claim 1, an X-ray irradiating unit that irradiates a subject with X-rays, and an X-ray irradiating unit that irradiates and transmits the subject X-ray detection means for detecting X-rays, projection data generation means for generating projection data based on transmitted X-rays detected by the X-ray detection means, input viewpoint coordinates, and position of the viewpoint with respect to the subject Based on the coordinates of the virtual light source input at a farther position, reconstruction processing means for reconstructing the generated projection data to generate volume data, and volume rendering for the generated volume data An X-ray diagnostic apparatus comprising: rendering means for performing a three-dimensional image, and display control means for displaying the generated three-dimensional image on a display means, wherein the input virtual light A light source position generation means for generating coordinates of the plurality of virtual light sources along a predetermined path on a hemisphere having a radius from a volume to the volume data as a radius and a position of the volume data as a center. The configuration processing means generates the volume data for each coordinate of the generated virtual light source by reconstructing the projection data based on the input viewpoint and the coordinates of the generated virtual light sources, The rendering means performs volume rendering on the volume data for each of the generated virtual light sources and generates the three-dimensional image for each of the generated virtual light sources.

  According to the X-ray diagnostic apparatus of claim 1, the position of the virtual light source is changed along a path based on a specific function without changing the viewpoint, and a plurality of continuous three-dimensional images are provided for each position of the virtual light source. Can be generated. As a result, it is possible to compare a three-dimensional image shaded by applying light from a plurality of directions with a fixed viewpoint and a two-dimensional image created by the X-ray diagnostic apparatus from the same viewpoint. Easy grasping and diagnosis. Further, by arranging the virtual light source in the circular orbit, light can be applied from all directions of the subject. Furthermore, by repeatedly displaying a continuous three-dimensional image in which virtual light sources are arranged on a linear trajectory, it is possible to visually recognize the light source as it moves back and forth on the linear trajectory, thereby facilitating a three-dimensional grasp.

[First Embodiment]
The X-ray diagnostic apparatus according to the first embodiment of the present invention will be described below. FIG. 1 is a block diagram showing functions of an X-ray diagnostic apparatus according to the present invention. A dotted line in FIG. 1 represents an instruction (command) system, and a solid line represents data transmission / reception.

  The execution control means 001 is composed of a CPU. The execution control unit 001 receives input from the input unit 010 and performs overall management of each unit such as time management.

  The X-ray irradiation means 002 includes an X-ray tube that irradiates a subject with X-rays and an X-ray diaphragm that forms an X-ray weight (cone beam) with respect to the X-rays irradiated from the X-ray tube. Yes. The X-ray tube is a vacuum tube that generates X-rays, and accelerates electrons emitted from a cathode (filament) at a high voltage to collide with a tungsten anode to generate X-rays. The X-ray diaphragm is located between the X-rays and between the subject, and narrows the X-ray beam irradiated from the X-ray tube to an irradiation range of a predetermined size in the X-ray detection unit 003. The X-ray irradiation unit 002 receives an instruction from the execution control unit 001 and irradiates the subject with X-rays by the method described above.

  The X-ray detection unit 003 detects and collects X-rays irradiated from the X-ray irradiation unit 002 and passing through the subject in response to a command from the execution control unit 001.

  The X-ray detection unit 003 transmits the detected and collected X-ray data to the projection data generation unit 004.

  The projection data generation unit 004 includes a CPU and a storage unit. The projection data generation unit 004 converts the X-ray data received from the X-ray detection unit 003 into visible light, further performs luminance multiplication, converts the data into electricity, and generates projection data.

  The projection data generation unit 004 stores the generated projection data in a storage unit that it owns.

  Here, as the X-ray detection unit 003 and the projection data generation unit 004, the X-ray I.D. I (image intensifier). Further, as the X-ray detection means 003, there is a flat detector in which X-ray detection elements are two-dimensionally arranged, and the projection data generation means 004 generates projection data from the transmitted X-ray dose detected by this two-dimensional arrangement of flat detectors. There are things to do.

  The reconstruction processing unit 005 has a CPU and a storage unit. The reconstruction processing unit 005 reads the projection data stored in the projection data generation unit 004, performs reconstruction processing based on the viewpoint coordinates and the virtual light source coordinates input in advance from the input unit 010, and performs volume processing. Generate data.

  Here, the coordinates of the viewpoint and the virtual light source input from the input unit 010 are the positions of the line of sight and the virtual light source corresponding to the subject, that is, the coordinates of the line of sight and the virtual light source with respect to the generated volume data, and (x, y Z) in a three-dimensional space. Then, based on the information about the position of the light source and the position of the light source with respect to the subject, volume data corresponding to the viewpoint and the position of the light source is created. Therefore, the volume data, the viewpoint, and the coordinates of the light source are expressed in the same coordinate space. Hereinafter, the volume data created based on the viewpoint and light source coordinates input in advance are referred to as “basic volume data”.

  Here, the positional relationship between the viewpoint input in advance and the virtual light source is set so that the distance from the subject to the light source is longer than the distance from the subject to the viewpoint. As a result, when performing volume rendering, the light becomes weaker toward the back from the viewpoint, and the contrast becomes more prominent depending on the distance from the viewpoint. Can stand out.

  Also, the reconstruction processing unit 005 receives the coordinates of the volume rendering virtual light source generated by the light source position generation unit 007, and each volume rendering based on the coordinates for volume rendering and the coordinates of the viewpoint input in advance. Volume data corresponding to the coordinates of the virtual light source is generated.

  The reconstruction processing means 005 stores the generated volume data in its own storage unit.

  FIG. 2 is a diagram for explaining the generation of the coordinates of a plurality of virtual light sources by the light source position generation means 007 from the basic volume data. Here, in FIG. 2, based on the viewpoint 202 that is input in advance and represented in the three-dimensional space (where the line-of-sight direction 204 represents the direction of the line of sight of the viewpoint 202) and the virtual light source 203. The basic volume data 201 generated by the reconstruction processing unit 005 is shown.

  The light source position generation unit 007 generates (1) a hemispherical surface on which a predetermined path is arranged, (2) generates a predetermined path on the hemispherical surface, (2-1) generates a circular orbit, or (2-2) a straight line. The operation is performed in a flow of generating a trajectory, and (3) generating a light source on the trajectory. A description will be given below along the flow of this operation.

  (1) The light source position generation means 007 is the basic volume generated by the coordinates of the virtual light source 203 input in advance from the input means 010 and the reconstruction processing means 005 represented in the coordinate space shown in FIG. Based on the position of the data 201, the distance from the coordinates of the virtual light source 203 to the basic volume data 201 is calculated. Here, the position of the volume data refers to a configuration in which a straight line extends from the viewpoint 202 in the line-of-sight direction 204 with respect to the basic volume data 201, and the center of the basic volume data 201 is calculated based on the first point of contact. There is a configuration based on the position. In the present embodiment, the first hit point is used as a reference.

  The light source position generation means 007 uses the calculated distance as the radius, the position of the basic volume data 201 as the center, and the hemisphere 205 in the coordinate space where the straight line connecting the viewpoint 202 and the position of the basic volume data 201 is at the apex. Ask for.

  (2) The light source position generation unit 007 receives the input of selection of the circular or linear trajectory from the input unit 010, and starts generating the circular orbit or straight line activation for generating the coordinates of the virtual light source.

  The light source position generation means 007 receives the input of the number of divisions from 011 as the main input. Hereinafter, a case where eight division numbers are set as the division number will be described.

  (2-1) When the circular light path is selected, the light source position generation unit 007 sets the circular path 207 centered on the vertex 208 of the hemisphere 205 with the length input from the input unit 010 as the radius 206. Generate. Here, having the vertex 208 as the center means that the center of the circular orbit 207 is located on a straight line connecting the vertex 208 and the position of the basic volume data 201. FIG. 3 is a diagram of the hemispherical surface 205 and the circular orbit 207 viewed from the direction of the coordinate 203 of the virtual light source. Here, in this embodiment, the radius is determined by an input from the operator, but a radius determined in advance may be used.

  The light source position generation unit 007 divides the circular orbit 207 generated as shown in FIG. 3 into eight set as the number of divisions, and generates the coordinates 301 of the volume rendering virtual light source at each position. Here, the coordinates 301 of the eight virtual light sources are represented by circles indicated by dotted lines.

  (2-2) The light source position generation unit 007, when a linear trajectory is selected, has a linear trajectory in a predetermined direction with a length input from the input unit 010 centered on the vertex 208 of the hemispherical surface 205. 401 is generated. FIG. 4 shows the hemispherical surface 205 and the linear trajectory 401 as viewed from the direction of the coordinate 203 of the virtual light source. In FIG. 4, a straight orbit extending in the left and right directions in FIG. 4 is shown as an example of a straight orbit, but this is any direction such as up and down or oblique in FIG. It may be a straight line.

  The light source position generation unit 007 divides the generated linear trajectory 401 into eight that are set as the number of divisions as shown in FIG. 4, and generates the coordinates 402 of the virtual light source for volume rendering at each position. Here, the coordinates 402 of the eight virtual light sources are represented by circles indicated by dotted lines. Here, in the present embodiment, a linear trajectory having a length input by the operator is used, but a length having a predetermined length may be used.

  The rendering unit 006 includes a CPU and a storage unit. The rendering unit 006 sequentially reads volume data corresponding to each volume rendering virtual light source stored in the reconstruction processing unit 005 along the path, and generates a volume rendering virtual generated by the light source position generation unit 007. Volume rendering is performed based on the coordinates of the light source and the viewpoint coordinates input in advance, and a three-dimensional image for each virtual light source for volume rendering is sequentially generated.

  The rendering unit 006 stores the generated image in its own storage unit.

  The display control unit 008 stores a predetermined format. For example, the format corresponding to the coordinates of the virtual light source along the circular trajectory is a format as shown in FIG. 5, or the format corresponding to the coordinates of the virtual light source along the linear trajectory is as shown in FIG. Or 5 is an example of a display format corresponding to the coordinates of the virtual light source along the circular trajectory, and FIG. 6 is an example of a display format corresponding to the coordinates of the virtual light source along the linear trajectory. .

  In this way, a format is used in which a three-dimensional image corresponding to the virtual light source is arranged at a position corresponding to the position of the virtual light source. Then, three-dimensional images are arranged sequentially so that the light source is reciprocating on a straight line, so that the three-dimensional recognition of the image according to the movement of the light source can be performed at a glance.

  The display control unit 008 displays the three-dimensional image stored in the rendering unit 006 on the display unit 009 according to the format.

  The display control unit 008 can also sequentially display the three-dimensional images stored in the rendering unit 006 one by one in response to the input from the input unit 010.

  Further, the display control unit 008 can receive the projection data from the projection data generation unit 004 and display the projection data and the generated three-dimensional image in a superimposed manner.

  By doing so, it is possible to confirm a three-dimensional image in which the way light strikes the subject gradually changes without changing the viewpoint, and it is possible to easily grasp the subject in three dimensions. Become. Further, when the projection data and the three-dimensional image are displayed in an overlapped manner, it is easy to compare them because the line-of-sight directions match.

Next, functions and effects of the present invention will be described. Here, a three-dimensional image in the case where volume rendering is performed by moving the virtual light source along the vertical trajectory will be described . The three-dimensional image in the case where the light source is above the subject is exposed to light from above, so that the upper part becomes brighter and the lower part becomes darker . Source 3D image when at the bottom of the subject is lower brightens top because it is exposed to light from below becomes dark. In this way, since the brightness changes, it becomes easy to grasp the shape of the object. Therefore, by changing the position of the virtual light source, it is possible to easily perform three-dimensional figure if it were any shape is subject.

  Next, a flow of generating and displaying a three-dimensional image in the X-ray diagnostic apparatus according to the present embodiment will be described with reference to FIG. FIG. 7 is a flowchart of the generation and display of a three-dimensional image of the X-ray diagnostic apparatus according to the first embodiment.

  Step S001: Upon receiving an input from the input unit 010, the X-ray irradiation unit 002 irradiates the subject with X-rays, and the X-ray detection unit 003 detects the transmitted X-rays.

  Step S002: The projection data generation unit 004 generates projection data based on the detected X-ray data received from the X-ray detection unit 003.

  Step S003: The reconstruction processing unit 005 generates basic volume data from the projection data received from the projection data generation unit 004 based on the viewpoint and virtual light source coordinates input in advance.

  Step S004: The light source position generation means 007 uses the distance from the coordinates of the virtual light source to the position of the basic volume data as the radius from the coordinates and basic volume data of the virtual light source input in advance, and sets the position of the basic volume data as the center. To generate a hemisphere. Further, in response to the selection of the path and the input of the length, the path is generated on the hemisphere, and the coordinates of the virtual light source for creating volume data are generated on the hemisphere along the path.

  Step S005: The reconstruction processing means 005 sequentially performs reconstruction processing on the virtual light source along the path based on the virtual light source for volume rendering, the viewpoint inputted in advance, and the projection data, and sequentially stores the volume data. Generate.

  Step S006: The rendering unit 006 sequentially performs volume rendering based on the generated volume data, and sequentially generates a three-dimensional image for each virtual light source for volume rendering.

  Step S007: The display control unit 008 sequentially displays the generated three-dimensional image on the display unit 009 in accordance with an instruction from the input unit 010, or displays the generated three-dimensional image as 1 Whether the images are sequentially displayed on the display unit 009 or a three-dimensional image generated by superimposing the projection data received from the projection data generation unit 004 is displayed on the display unit 009.

  Furthermore, in the present embodiment, the fixed values are input from the operator for the radius of the circular orbit and the length of the straight orbit, but for example, the radius of the circular orbit is gradually increased while the button is pressed. Or draw the 3D image while extending the length of the linear trajectory, the length is fixed when the button is released, and the 3D image for each virtual light source coordinate in the path is displayed in sequence. Any configuration is acceptable.

  Further, the display control means 008 displays the three-dimensional image on the display means by repeatedly displaying the three-dimensional image sequentially by the number of times input in advance by the input means 010 or while pressing the button. May be configured to repeatedly display a three-dimensional image sequentially and stop when the button is released.

  Further, it is preferable that the display control unit 008 has a mode for fixing at the position at the time of stopping and a mode for returning to the position of the first line of sight when the display control unit 008 is stopped when sequentially displaying three-dimensional images. .

  Further, the above-described button for causing the display control unit 008 to control the display may be a hand or a switch, and it is preferable that the button is arranged in both the operation room and the examination room.

  Furthermore, in order to quickly perform the display as described above, it is preferable to construct a three-dimensional image by volume rendering at a virtual light source position on the path in advance and display the three-dimensional image sequentially.

  In this embodiment, the path can be set over the entire hemispherical surface generated by the light source position generation unit 007. However, the line of sight including the position of the volume data ensures that the virtual light source is positioned behind the viewpoint with respect to the subject. A path may be set only in a region where the distance from the virtual light source to the plane orthogonal to the direction is longer than the distance from the line of sight, and a virtual light source for volume rendering may be generated.

  As described above, according to the X-ray diagnostic apparatus according to the present embodiment, it is possible to easily generate a three-dimensional image in which the way of applying light is changed along an efficient path in making a diagnosis with the viewpoint fixed. Can be generated. As a result, the examining doctor or the like can easily grasp the subject three-dimensionally.

[Second Embodiment]
An X-ray diagnostic apparatus according to a second embodiment of this invention will be described. The X-ray diagnostic apparatus according to the present embodiment grasps the position of the catheter in the X-ray diagnostic apparatus according to the first embodiment, obtains the direction of the blood vessel to be observed, and is a straight line perpendicular to the blood vessel direction. The virtual light source for volume rendering is generated on the orbit. Here, the configuration of the X-ray diagnostic apparatus according to the second embodiment includes a catheter position detecting unit 011 for detecting the position of the catheter in the first embodiment as shown by a one-dot chain line in FIG. It is. Hereinafter, generation of a virtual light source for volume rendering will be described.

  Similarly to the first embodiment, the light source position generation unit 007 obtains a hemispherical surface based on the basic volume data and the coordinates of the virtual light source input in advance.

  The light source position generation unit 007 acquires information on the position of the catheter in the subject from the catheter position detection unit 011.

  The light source position generation unit 007 obtains the extending direction of the blood vessel in which the catheter is inserted. This is obtained from the moving direction of the catheter, or the direction in which the blood vessel extends from the image based on the position of the catheter in the projection data.

  The light source position generation means 007 sets a linear trajectory centered on the apex on the hemisphere having the input length in a direction orthogonal to the extending direction of the blood vessel in which the catheter is inserted.

  The light source position generation unit 007 generates a virtual light source for volume rendering based on the number of divisions input on the set straight trajectory.

  The catheter position detecting means 011 detects the position of the catheter by detecting the sound wave generated from the sound wave generating means arranged at the tip of the catheter, or detects the position of the catheter tip from the X-ray fluoroscopic image. And calculating means for calculating the position of the catheter from the detected position. These descriptions are publicly known, and are described, for example, in JP-A-5-7576 and JP-A-5-161634.

  The catheter position detection unit 011 transmits the position of the catheter corresponding to the detected projection data to the light source position generation unit 007.

  As described above, the X-ray diagnostic apparatus according to this embodiment can generate a three-dimensional image based on a virtual light source generated in a direction orthogonal to the direction of the blood vessel in which the catheter is inserted. Here, the blood vessel into which the catheter is inserted is a blood vessel being observed, and is a site where it is necessary to best grasp the blood vessel. In addition, the movement path of the light source that can best perform the three-dimensional grasping is a case where the light source is moved in a direction perpendicular to the cylinder direction in the case of a cylindrical object. Therefore, it is most effective for the diagnosis to move the light source along a path orthogonal to the blood vessel in which the catheter is inserted as in the X-ray diagnostic apparatus according to the present embodiment, and the operator is required to make a three-dimensional blood vessel necessary for the diagnosis. Can be easily grasped.

Block diagram of an X-ray diagnostic apparatus according to the present invention The figure for demonstrating the production | generation of the coordinate of the virtual light source by a light source position production | generation means The figure for explaining the generation of the coordinates of the virtual light source in the path of the circular orbit Diagram for explaining generation of coordinates of virtual light source in linear trajectory The figure for demonstrating the format for displaying the three-dimensional image corresponding to the virtual light source along a circular orbit The figure for demonstrating the format for displaying the three-dimensional image corresponding to the virtual light source along a linear track | orbit The figure of the flowchart of a production | generation and display of a three-dimensional image of the X-ray diagnostic apparatus concerning 1st Embodiment

Explanation of symbols

001 execution control means 002 X-ray irradiation means 003 X-ray detection means 004 projection data generation means 005 reconstruction processing means 006 rendering means 007 light source position generation means 008 display control means 009 display means 010 input means 011 catheter position detection means

Claims (8)

X-ray irradiation means for irradiating the subject with X-rays;
X-ray detection means for detecting X-rays irradiated from the X-ray irradiation means and transmitted through the subject;
Projection data generation means for generating projection data based on transmitted X-rays detected by the X-ray detection means;
Reconstruction processing means for reconstructing the generated projection data and generating volume data based on the coordinates of the input viewpoint and the coordinates of the virtual light source input at a position far from the position of the viewpoint relative to the subject When,
Rendering means for performing volume rendering on the generated volume data to generate a three-dimensional image;
An X-ray diagnostic apparatus comprising: display control means for displaying the generated three-dimensional image on a display means;
Light source position generation for generating coordinates of a plurality of virtual light sources along a predetermined path on a hemisphere with the distance from the input virtual light source to the volume data as a radius and the position of the volume data as a center. Further comprising means,
The reconstruction processing means includes
Based on the input viewpoint and the coordinates of each generated virtual light source, the projection data is reconstructed to generate the volume data for each of the generated virtual light source coordinates,
The rendering means includes
An X-ray diagnostic apparatus, wherein volume rendering is performed on the volume data for each of the generated virtual light sources to generate the three-dimensional image for each of the generated virtual light sources.   The light source position generation unit equally divides the predetermined path by a predetermined number of divisions and sequentially obtains the coordinates of the plurality of virtual light sources along the predetermined path. X-ray diagnostic equipment. The light source position generation means, as the predetermined path, has an input distance as a radius, along a circular orbit on the hemisphere, the center of which is positioned on a straight line connecting the apex of the hemisphere and the center. The X-ray diagnostic apparatus according to claim 1, wherein coordinates of the plurality of virtual light sources are generated. The light source position generation means generates coordinates of the plurality of virtual light sources along a linear trajectory on the hemisphere passing through the apex of the hemisphere as a length of the input distance as the predetermined path. The X-ray diagnostic apparatus according to claim 1 or 2, wherein The catheter position detecting means for detecting the position of the catheter inserted into the blood vessel, and the light source position generating means, as the predetermined path, the direction in which the blood vessel in which the catheter is inserted is extended based on the position of the catheter The coordinates of the plurality of virtual light sources are generated along a path in a direction orthogonal to the extending direction, and along a linear trajectory passing through the apex of the hemispherical surface. The X-ray diagnostic apparatus according to claim 2. Wherein the display control unit, said receiving said projection data from the projection data generating means, and a three-dimensional image corresponding to the predetermined coordinate for each of the virtual light source which is sequentially generated along a path superimposed on the projection data The X-ray diagnosis apparatus according to claim 1, wherein the X-ray diagnosis apparatus displays the information sequentially on a display unit.   The display control means further includes a display control means for sequentially displaying a three-dimensional image corresponding to the coordinates for each virtual light source sequentially generated along the predetermined path in a prestored format on the display means. An X-ray diagnostic apparatus according to any one of claims 1 to 5, further comprising: The predetermined path is included in a region on the hemisphere and far from a plane including the volume data than the coordinates of the viewpoint. The X-ray diagnostic apparatus described.

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