| 摘要 |
To correct an effect upon an image which is caused by a geometric deflection of an x-ray source and an x-ray detector which changes by the rotation angles of a C-arm and obtain a high-precision CT image without distortion, distortion sensors which measure said distortion are anchored to a C-arm (10), said C-arm (10) having an x-ray source (20) anchored to one end thereof, and an x-ray detector (30) anchored to the other end thereof. A computer which calculates a tomographic image of a subject using projection data which the x-ray detector (30) has detected comprises a deflection calculation unit which, using the distortion of the C-arm (10) which the distortion sensors have measured, calculates the geometric deflections of the x-ray source and the x-ray detector with respect to the center of rotation of the C-arm. The computer corrects the projection data using the geometric deflections which the deflection calculation unit has calculated. |
