Apparatus and method for X-ray computer tomography
View Patent ↗An X-ray computed tomographic apparatus of the invention includes a display portion to display, on a screen, a scanogram related to a subject together with a quadrilateral frame line specifying a reconstruction range, an input portion to input a command to transform the frame line specifying the reconstruction range to a parallelogram or rotate the frame line specifying the reconstruction range, a gantry to perform scanning in a scan range corresponding to the reconstruction range, and a reconstruction portion to reconstruct image data related to plural slices, parallel to one another and included in the reconstruction range, slice-by-slice on the basis of projection data acquired by the scanning.
1. An X-ray computed tomographic apparatus, comprising:
a display portion to display, on a screen, a scanogram related to a subject together with a quadrilateral frame line specifying a reconstruction range;
an input portion to input a command to transform the frame line specifying said reconstruction range to a parallelogram or rotate the frame line specifying said reconstruction range;
a scan portion to perform scanning in a scan range corresponding to said reconstruction range; and
a reconstruction portion to reconstruct image data related to plural slices, parallel to one another and included in said reconstruction range, slice-by-slice on the basis of projection data acquired by said scanning.
2. The X-ray computed tomographic apparatus according to claim 1 , wherein:
a center line of said transformed or rotated reconstruction range is tilted with respect to a center line of said scan range.
3. The X-ray computed tomographic apparatus according to claim 2 , wherein:
a distance from the center line of said scan range to a center of each of said plural slices varies from slice to slice.
4. The X-ray computed tomographic apparatus according to claim 2 , wherein:
said slices are tilted with respect to the center line of said transformed reconstruction range.
5. The X-ray computed tomographic apparatus according to claim 4 , wherein:
said slices are orthogonal to the center line of said scan range.
6. The X-ray computed tomographic apparatus according to claim 2 , wherein:
said slices are orthogonal to the center line of said rotated reconstruction range.
7. The X-ray computed tomographic apparatus according to claim 6 , wherein:
said slices are tilted with respect to the center line of said scan range.
8. The X-ray computed tomographic apparatus according to claim 1 , wherein:
an icon corresponding to transformation or rotation is displayed in the vicinity of the frame line specifying said reconstruction range.
9. The X-ray computed tomographic apparatus according to claim 1 , wherein:
said scan range is set to a shape of a cylindrical column whose longitudinal cross section is an oblong having an axis of rotation at a center and covering said transformed or rotated reconstruction range.
10. The X-ray computed tomographic apparatus according to claim 1 , wherein:
said scan range covers said transformed or rotated reconstruction range.
11. The X-ray computed tomographic apparatus according to claim 10 , wherein:
said scan range has a length longer than said transformed or rotated reconstruction range with respect to a direction parallel to a central axis thereof.
12. The X-ray computed tomographic apparatus according to claim 10 , wherein:
said scan range has a width almost equal to said transformed or rotated reconstruction range with respect to a direction orthogonal to a central axis thereof.
13. A method for X-ray computed tomography, comprising:
displaying, on a screen, a scanogram related to a subject together with a quadrilateral frame line specifying a reconstruction range;
inputting a command to transform the frame line specifying said reconstruction range to a parallelogram or rotate the frame line specifying said reconstruction range;
performing scanning in a scan range corresponding to said reconstruction range; and
reconstructing image data related to plural slices, parallel to one another and included in said reconstruction range, slice-by-slice on the basis of projection data acquired by said scanning.
14. The method for X-ray computed tomography according to claim 13 , wherein:
a center line of said transformed or rotated reconstruction range is tilted with respect to a center line of said scan range.
15. The method for X-ray computed tomography according to claim 14 , wherein:
a distance from the center line of said scan range to a center of each of said plural slices varies from slice to slice.
16. The method for X-ray computed tomography according to claim 14 , wherein:
said slices are tilted with respect to the center line of said transformed reconstruction range.
17. The method for X-ray computed tomography according to claim 16 , wherein:
said slices are orthogonal to the center line of said scan range.
18. The method for X-ray computed tomography according to claim 14 , wherein:
said slices are orthogonal to the center line of said rotated reconstruction range.
19. The method for X-ray computed tomography according to claim 18 , wherein:
said slices are tilted with respect to the center line of said scan range.
20. The method for X-ray computed tomography according to claim 13 , wherein:
an icon corresponding to transformation or rotation is displayed in the vicinity of the frame line specifying said reconstruction range.
21. The method for X-ray computed tomography according to claim 13 , wherein:
said scan range is set to a shape of a cylindrical column whose longitudinal cross section is an oblong having an axis of rotation at a center and covering said transformed or rotated reconstruction range.
22. The method for X-ray computed tomography according to claim 13 , wherein:
said scan range covers said transformed or rotated reconstruction range.
23. The method for X-ray computed tomography according to claim 22 , wherein:
said scan range has a length longer than said transformed or rotated reconstruction range with respect to a direction parallel to a central axis thereof.
24. The method for X-ray computed tomography according to claim 22 , wherein:
said scan range has a width almost equal to said transformed or rotated reconstruction range with respect to a direction orthogonal to a central axis thereof.