X-ray diagnostic apparatus

1. An X-ray diagnostic apparatus, comprising:

an X-ray imaging unit including an X-ray tube and an X-ray detecting unit configured to generate an X-ray image;

an image generating unit configured to generate a 3D non-blood vessel image and a 3D blood vessel image from an original 3D image generated by the X-ray diagnostic apparatus or an X-ray CT apparatus;

a projection image generating unit configured to generate a non-blood vessel projection image from the 3D non-blood vessel image and to generate a blood vessel projection image from the 3D blood vessel image;

a positional shift identifying unit configured to identify a positional shift between the X-ray image and the non-blood vessel projection image;

a correcting unit configured to correct the blood vessel projection image on the basis of the positional shift; and

a display unit configured to display the X-ray image and the corrected blood vessel projection image.

2. An apparatus according to claim 1 , wherein the X-ray image is a real-time image.

3. An apparatus according to claim 1 , wherein the original 3D image is a CT contrast image.

4. An apparatus according to claim 1 , wherein the original 3D image is a rotational X-ray contrast image.

5. An apparatus according to claim 1 , wherein the image generating unit generates the non-blood vessel image from the original 3D image by threshold processing based on CT values.

6. An apparatus according to claim 1 , further comprising a reconstructing unit which reconstructs the 3D non-blood vessel image from a plurality of X-ray images generated by the X-ray imaging mechanism at different imaging angles.

7. An apparatus according to claim 1 , further comprising a reconstructing unit which reconstructs the 3D non-blood vessel image from a plurality of mask images generated by the X-ray imaging mechanism at different imaging angles under a rotational contrast imaging sequence.

8. An apparatus according to claim 1 , wherein the image generating unit generates the 3D blood vessel image from the original 3D image by threshold processing.

9. An apparatus according to claim 1 , further comprising a reconstructing unit which reconstructs a 3D DA image from a rotational X-ray contrast image generated by the X-ray imaging mechanism, and an extracting unit which extracts a 3D blood vessel image from the 3D DA image on the basis of voxel values.

10. An apparatus according to claim 1 , further comprising a reconstructing unit which reconstructs the 3D blood vessel image from a DSA image of a rotational X-ray contrast image generated by the X-ray imaging mechanism.

11. An apparatus according to claim 1 , further comprising a reconstructing unit which reconstructs the 3D blood vessel image from a rotational X-ray contrast image generated by the X-ray imaging mechanism under a contrast sequence, and a reconstructing unit which reconstructs the 3D non-blood vessel image from a rotational X-ray contrast image generated by the X-ray imaging mechanism under a masked sequence.

12. An apparatus according to claim 1 , wherein the positional shift identifying unit identifies an angle difference between the X-ray image and the non-blood vessel projection image, an image enlargement ratio difference between the X-ray image and the non-blood vessel projection image, and a position difference between the X-ray image and the non-blood vessel projection image.

13. An apparatus according to claim 12 , further comprising an input device for manual fine adjustment of a positional shift between the X-ray image and the non-blood vessel projection image.

14. An apparatus according to claim 1 , wherein the display unit arranges and displays the X-ray image and the corrected blood vessel projection image at the same observation angle and the same position on a window.

15. An apparatus according to claim 14 , wherein the display unit superimposes and displays a characteristic feature of the X-ray image on the corrected blood vessel projection image.

16. An apparatus according to claim 15 , wherein the characteristic feature is a marker attached to a distal end of the device or to the device.

17. An apparatus according to claim 1 , wherein the display unit superimposes and displays the corrected blood vessel projection image on the X-ray image.

18. An apparatus according to claim 1 , further comprising a subtraction processing unit which subtracts the 3D non-blood vessel image from the X-ray image.

19. An apparatus according to claim 18 , wherein the display unit superimposes and displays a subtraction image obtained by the subtraction processing unit on the 3D blood vessel image.

20. An apparatus according to claim 18 , wherein the subtraction processing unit has a function of subtracting a projection image of the 3D non-blood vessel image from the X-ray image in accordance with an arbitrary weighting coefficient.

21. An apparatus according to claim 1 , wherein the display unit combines and displays the non-blood vessel projection image on the X-ray image.

22. An apparatus according to claim 21 , wherein the display unit superimposes and displays the non-blood vessel projection image on the X-ray image in different colors.

23. An apparatus according to claim 21 , wherein the display unit edge-enhances, combines, and displays the 3D non-blood vessel image and the X-ray image.

24. An apparatus according to claim 1 , wherein the display unit displays a subtraction image based on a projection image of the 3D non-blood vessel image and the X-ray image.

25. An X-ray diagnostic apparatus, comprising:

an X-ray imaging unit including an X-ray tube and an X-ray detecting unit configured to generate an X-ray image;

an image generating unit configured to generate a 3D non-blood vessel image and a 3D blood vessel image from an original 3D image generated by the X-ray diagnostic apparatus or an X-ray CT apparatus;

a projection image generating unit configured to generate a non-blood vessel projection image from the 3D non-blood vessel image and to generates a blood vessel projection image from the 3D blood vessel image;

a positional shift identifying unit configured to identify a positional shift between the X-ray image and the non-blood vessel projection image;

a correcting unit configured to correct a positional shift of the blood vessel projection image on the basis of the positional shift; and

a combining unit configured to combine the X-ray image and the corrected blood vessel projection image.

26. An X-ray diagnostic apparatus, comprising:

an X-ray imaging unit including an X-ray tube and an X-ray detecting unit configured to generate an X-ray image;

an image generating unit configured to generate a 3D non-blood vessel image and a 3D blood vessel image from an original 3D image generated by the X-ray diagnostic apparatus or an X-ray CT apparatus;

a projection image generating unit configured to generate a non-blood vessel projection image from the 3D non-blood vessel image and to generates a blood vessel projection image from the 3D blood vessel image;

a positional shift identifying unit configured to identify a positional shift between the X-ray image and the non-blood vessel projection image; and

a combining unit configured to combine the X-ray image and the blood vessel projection image on the basis of the positional shift.

27. An image processing apparatus, comprising:

a storage unit configured to store an X-ray image, 3D non-blood vessel image, and 3D blood vessel image associated with the same subject;

a projection image generating unit configured to generate a non-blood vessel projection image from the 3D non-blood vessel image and to generates a blood vessel projection image from the 3D blood vessel image;

a positional shift identifying unit configured to identify a positional shift between the X-ray image and the non-blood vessel projection image; and

a combining unit configured to combine the X-ray image and the blood vessel projection image on the basis of the positional shift.