X-ray image diagnosing apparatus

1. An X-ray image diagnosing apparatus comprising:

a top plate for laying a subject to be examined;

an X-ray detecting section including an X-ray detector having a first visual field size and a high-resolution detector showing a resolution higher than the X-ray detector and having a second visual field size smaller than the visual field of the X-ray detector;

an X-ray generating section for irradiating the subject with X-rays;

a holding section for holding the X-ray detecting section and the X-ray generating section so as to make them face each other;

an image processing section for generating a first X-ray image by means of the X-ray detector and a second X-ray image by means of the high-resolution detector;

a display section for displaying the first X-ray image and the second X-ray image;

a region defining section for displaying a spot corresponding to part of the second X-ray image or a region corresponding to the second X-ray image on the first X-ray image and specifying the position of the high-resolution detector by moving the spot or the region;

a positional displacement calculating section for determining the coordinate difference between the center position of the first X-ray image and the position of the spot indicating the specified position of the high-resolution detector or a substantial center position of the region; and

a move control section for controlling the top plate or the holding section so as to move the substantial center position of the second X-ray image to a substantial center of the image display region of the display section.

2. The X-ray image diagnosing apparatus according to claim 1 , wherein the move control section controls the high-resolution detector in conjunction with an operation of controlling the top plate or the holding section.

3. The X-ray image diagnosing apparatus according to claim 2 , further comprising:

a support mechanism for supporting the high-resolution detector in front of the X-ray detector; and

a retreat mechanism arranged in the support mechanism to allow the high-resolution detector to be drawn away from the front side of the X-ray detector.

4. The X-ray image diagnosing apparatus according to claim 3 , further comprising a high-resolution detector drive section capable of switching from the X-ray detector to the high-resolution detector when retreating by the retreat mechanism.

5. The X-ray image diagnosing apparatus according to claim 4 , wherein the coordinate difference calculated by the positional displacement calculating section can be displayed by the region specifying section.

6. The X-ray image diagnosing apparatus according to claim 5 , further comprising a button for starting a move control operation by the move control section.

7. An X-ray image diagnosing apparatus comprising:

an X-ray detecting section including an X-ray detector having a first visual field size and a high-resolution detector showing a resolution higher than the X-ray detector and having a second visual field size smaller than the visual field of the X-ray detector;

an X-ray generating section for irradiating a subject with X-rays;

a C-arm holding unit carrying an imaging system formed by an X-ray detecting section disposed oppositely relative to the X-ray generating section so as to be capable of rotating;

a C-arm drive section for controlling the position of the C-arm holding unit;

an image processing section for generating X-ray images of a subject by means of the X-ray detector and the high-resolution detector;

a ROI defining section for displaying a marker corresponding to the second visual field size as a ROI defining image on the X-ray image of the first visual field size and defining the ROI by moving the marker to the ROI;

a positional displacement calculating section for determining the coordinate difference between the center position of the X-ray image of the first visual field size and the center position of the marker; and

a move control section for controlling an operation of moving the center position of the ROI substantially to the center of the X-ray image of the first visual field size according to the coordinate difference by controlling the C-arm drive section.

8. The X-ray image diagnosing apparatus according to claim 7 , wherein the move control operation can be selectively executed by depressing a move button.

9. The X-ray image diagnosing apparatus according to claim 7 , wherein the coordinate difference calculated by the positional displacement calculating section is further displayed in the ROI defining image.

10. The X-ray image diagnosing apparatus according to claim 9 , wherein the move control operation can be selectively executed by depressing a move button.

11. An X-ray image diagnosing apparatus comprising:

an X-ray detecting section including an X-ray detector having a first visual field size and a high-resolution detector showing a resolution higher than the X-ray detector and having a second visual field size smaller than the visual field of the X-ray detector;

a C-arm holding unit carrying an X-ray generating section for irradiating a subject with X-rays and an imaging system formed by an X-ray detecting section disposed oppositely relative to the X-ray generating section so as to be capable of rotating;

a bed arranged between the X-ray generating section and the X-ray detecting section;

a C-arm drive section for controlling the position of the C-arm holding unit;

a top plate drive section for controlling the position of the top plate of the bed;

an image processing section for generating X-ray images of a subject by means of the X-ray detector and the high-resolution detector;

a ROI defining section for displaying a marker corresponding to the second visual field size as a ROI defining image on an X-ray image of the first visual field size and defining the ROI by moving the marker to the ROI;

a positional displacement calculating section for determining the coordinate difference between the center position of the X-ray image of the first visual field size and the center position of the marker; and

a move control section for controlling an operation of moving the center position of the ROI substantially to the center of the X-ray image of the first visual field size according to the coordinate difference by controlling the C-arm drive section and the top plate drive section.

12. The X-ray image diagnosing apparatus according to claim 11 , wherein the coordinate difference calculated by the positional displacement calculating section is further displayed in the ROI defining image.

13. The X-ray image diagnosing apparatus according to claim 12 , wherein the X-ray detector is an FPD.

14. The X-ray image diagnosing apparatus according to claim 13 , further comprising:

a support mechanism for supporting the high-resolution detector in front of the X-ray detector; and

a retreat mechanism arranged in the support mechanism to allow the high-resolution detector to be drawn away from the front side of the X-ray detector.

15. The X-ray image diagnosing apparatus according to claim 14 , further comprising a high-resolution detector drive section capable of switching from the X-ray detector to the high-resolution detector by controlling a retreat mechanism arranged in the support mechanism at the time of controlling an operation of moving the center position of the X-ray image of the first visual field size to the center position of the ROI.