| 摘要 |
In an improved computed tomography data acquisition sequence, fan-beam or cone-beam projection data are collected in a manner which avoids the need for interpolation during reordering to parallel-beam projections. Rather than sampling all channels in a detector array as a whole at each rotation angle, the channels are sampled sequentially in a predetermined number of groups. A first group is sampled, and following a delay, subsequent groups are sampled. The delay is determined by the angular spacing of the detectors and the gantry rotation speed. The projections within a group can be sampled either simultaneously or successively. The invention is applicable to medical and material imaging systems.
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