| 摘要 |
A CT scanner includes support means for supporting a radiation source and a detection system in a predetermined spatial relationship and for rotation about a rotation axis, and means for providing relative translation between an object being scanned and the support means as the radiation source and detection system rotate about said rotation axis so as to provide a scan through a predetermined volume of said object. The detection system comprises a plurality of detectors which are offset from a center line passing from the radiation source through the rotation axis, or includes a detection system which is asymmetrically arranged relative to that center line. In the latter case the detectors can be offset or not. Using acquired data, additional projection data is generated preferably through interpolation techniques so as to provide a complete set of data for a predefined slice plane within the scanned volume, which can be subsequently used to back project a tomogram of the object. The complete set of data represents the set of data that would have been generated by the detection system if the offset system had been centered, or the asymmetric system had been symmetric, relative to the center line. |
