Ct system for spirally scanning subject on a movable bed synchronized to

Abstract

A computerized tomography system which includes an X-ray generator for producing X-rays, an X-ray detector array for detecting the X-rays transmitted through a subject, and a subject bed. The X-ray tube and the X-ray detectors are opposed to each other, and the X-ray beams are irradiated upon the subject in a sectorial manner at a large number of angles to scan the subject while the X-ray tube and the X-ray detectors are being revolved around the subject, the X-ray tube and X-ray detectors remaining opposed to each other the during revolution. The system includes a system for rapidly and continuously revolving a frame bearing the X-ray tube, a system for moving the subject bed perpendicularly to a plane of revolution of the X-ray tube and for moving the subject bed synchronously with the revolution of the X-ray tube, a system for scanning the subject along with the movement of the subject bed in a spiral with respect to a coordinate system positioned about an imaginary axis passing through the subject, and a system for obtaining a reconstructed tomogram of an arbitrary cross-section within a range from a position corresponding to a beginning of the spiral scanning to a position corresponding to an end of the spiral scanning. A method of operating the computerized tomography system is also provided.