X-ray diagnostic apparatus

1. An X-ray diagnostic apparatus comprising:

processing circuitry configured to

obtain, with respect to a plurality of groups of time-course fluoroscopic images that are obtained by acquiring a subject injected with a contrast media, in at least two directions, each of which intersect, a first time density curve that indicates transition of a signal intensity of the contrast media in a proximal region to which the contrast media flows earlier than a region of interest, and

reconstruct three-dimensional image data in the region of interest such that a value that is obtained by projecting a voxel value approximates a value of a corresponding pixel in each of the groups of time-course fluoroscopic images, the voxel value being represented by a second time density curve that is obtained by deforming the first time density curve with a factor that is related to the contrast media; and

a display configured to display a newly obtained fluoroscopic image with a blood vessel image based on the three-dimensional image data.

2. The X-ray diagnostic apparatus according to claim 1 , wherein the display is configured to display a superimposed image obtained by superimposing the blood vessel image on the newly obtained fluoroscopic image.

3. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to reconstruct the three-dimensional image data such that the value that is obtained by projecting the voxel value approximates the value of the pixel, the voxel value being represented by using the second time density curve that is changed with at least one factor among dilution and spread of the contrast media within a blood vessel, speed degradation due to a friction of a blood vessel wall, and a reaching delay time.

4. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to obtain each of the first time density curve in the proximal region designated by an operator for each fluoroscopic image that has been acquired in the two directions by bi-plane system.

5. The X-ray diagnostic apparatus according to claim 1 , wherein the region of interest includes a region where a blood vessel is bifurcated.

6. The X-ray diagnostic apparatus according to claim 1 , wherein the display is configured to display the blood vessel image corresponding to a direction of acquiring the newly obtained fluoroscopic image.

7. The X-ray diagnostic apparatus according to claim 3 , wherein the processing circuitry is configured to reconstruct the three-dimensional image data such that a difference in voxel values of adjacent voxels is minimized.

8. The X-ray diagnostic apparatus according to claim 1 , wherein the processing circuitry is configured to

obtain information on a time change in the contrast media of each pixel with regard to each of the groups of time-course fluoroscopic images, and

reconstruct the three-dimensional image data by using a sum of the time changes.

9. The X-ray diagnostic apparatus according to claim 8 , wherein the processing circuitry is configured to reconstruct the three-dimensional image data such that a time change in a voxel value is continuous with respect to a voxel at an identical position in three-dimensional image data that is continuous in terms of time.

10. The X-ray diagnostic apparatus according to claim 8 , wherein the processing circuitry is configured to reconstruct, as a blood vessel region, a voxel of which a time change in a voxel value is negative with respect to a voxel at an identical position in three-dimensional image data that is continuous in terms of time.