Radiography apparatus wherein interleaving of beam paths is effected by changing the phase of the timing pulses

摘要

In computerized tomographic apparatus in which radiation from a source is projected through a body along a plurality of substantially linear beam paths and the source is rotated around the body, interleaving of beam paths is effected by changing the phase of timing pulses, with respect to the rotational movement, at a suitable stage in the scan. A bank of detectors is used to detect the radiation emergent from the body along said paths and a feature of the invention is to change the phase for each detector at a respective time so that no beam paths are duplicated but all sets of interleaved and original beam paths are completed in a single revolution of the scan.