X-ray diagnostic apparatus

1. An X-ray diagnostic apparatus comprising:

a holding device including an X-ray generator configured to generate X-rays which are emitted to a subject placed on a couch top, and an X-ray detector configured to detect X-rays which have passed through the subject, the holding device being configured to movably hold the X-ray generator and the X-ray detector; and

processing circuitry configured to

generate an X-ray image of the subject, based on an output of the X-ray detector,

detect, based on the generated X-ray image and a landmark image which is stored in a memory, a landmark from the X-ray image,

set an interference judgment region between the holding device and an interference object, based on the landmark detected from the X-ray image, and

control movement of the holding device, based on the set interference judgment region.

2. The X-ray diagnostic apparatus of claim 1 , wherein the landmark is a shape of a part of an instrument.

3. The X-ray diagnostic apparatus of claim 1 , wherein the memory is configured to associate and store the landmark image and a position and a size of a target corresponding to the landmark image, and

wherein the processing circuitry is configured:

to detect the landmark from the generated X-ray image by referring to the stored landmark image, and to specify the position and the size of the target corresponding to the detected landmark;

to derive a position and a size of the interference object including the target, the couch top and the subject, based on the specified position and size and a geometrical imaging condition of the X-ray image; and

to set the interference judgment region between the holding device which includes the X-ray generator and the X-ray detector, and the interference object, based on the derived position and size.

4. The X-ray diagnostic apparatus of claim 1 , a wherein the memory is configured to associate and store the landmark image and a position and a size of a target corresponding to the landmark image, and

wherein the memory is configured to further store an operation history indicating a locus of movement of the holding device, and

the processing circuitry is configured to update the interference judgment region in a manner to exclude a region corresponding to the locus, based on the operation history.

5. The X-ray diagnostic apparatus of claim 4 , wherein the processing circuitry is configured to change a movement speed in the interference judgment region, based on the operation history.

6. The X-ray diagnostic apparatus of claim 4 , wherein the processing circuitry configured to initialize the interference judgment in a manner to restore the excluded region, by using as a trigger a case in which a predetermined condition is satisfied.

7. The X-ray diagnostic apparatus of claim 4 , wherein the processing circuitry is configured to control the movement in a manner to lower a movement speed in the excluded region, when the interference judgment region is updated in accordance with an operation in which a distance between the holding device and the interference object becomes smaller.

8. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is an image of a magnetic pad.

9. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is an edge of an extension auxiliary couch top.

10. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is an edge of an arm rest.

11. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is a head fixing instrument.

12. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is a phantom.

13. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is a bone of a lower limb of the subject.

14. The X-ray diagnostic apparatus of claim 1 , wherein the landmark image stored in a memory is a bone of the head of the subject.