X-ray diagnostic apparatus

1. An X-ray diagnostic apparatus comprising:

processing circuitry configured to

acquire a plurality of medical images, each including a region of interest, in chronological order,

identify two medical images among the plurality of medical images, a moving distance of the region of interest between the two medical images corresponding to a distance derived from a parallax angle, and

cause a display to display a stereoscopic image by displaying the identified two medical images.

2. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to identify two medical images in which the moving distance of the region of interest matches with the distance derived from the parallax angle, or is approximated to the distance derived from the parallax angle.

3. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to derive the distance corresponding to the parallax angle when the region of interest moves between two regions that are divided by an image center line of one of the acquired medical images, identify two medical images in which a distance between positions of the region of interest in images corresponds to the derived distance, and cause the display to display a stereoscopic image by displaying the identified two medical images.

4. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to derive the distance corresponding to the parallax angle when the region of interest moves within either one of two regions that are divided by an image center line of one of the acquired medical images, identify two medical images in which a distance between positions of the region of interest in images corresponds to the derived distance, and cause the display to display a stereoscopic image by displaying the identified two medical images.

5. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to cause the display to display a stereoscopic image by displaying the identified two medical images after rotating the medical images such that a moving direction of the region of interest is a horizontal direction.

6. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to control an irradiation direction of an X-ray such that the moving distance of the region of interest between images corresponds to the distance that is derived from the parallax angle.

7. The X-ray diagnostic apparatus according to claim 1 , wherein

for medical images of a part that moves periodically, the processing circuitry is configured to identify each of medical images of two phases in which the moving distance of the region of interest between images corresponds to the distance that is derived from the parallax angle.

8. The X-ray diagnostic apparatus according to claim 1 , wherein

the processing circuitry is configured to cause the display to display a region that is a part of the medical image, and that includes the region of interest.

9. The X-ray diagnostic apparatus according to claim 8 , wherein

the processing circuitry is configured to cause the display to display the region in an enlarged manner.

10. An medical image displaying method comprising:

acquiring a plurality of medical images each including a region of interest in chronological order,

identifying two medical images among the plurality of medical images, a moving distance of the region of interest between the two medical images corresponding to a distance derived from a parallax angle, and

causing a display to display a stereoscopic image by displaying the identified two medical images.