Fan beam traverse-and-rotate CT scanner

摘要

In a medical radiographic apparatus of the kind in which a fan shaped spread of X-rays is subject to lateral and orbital motions, it is disclosed that the orbital step between each lateral scan need not be exactly related to the angular spread of the fan provided that parallel sets of beams are irradiated over a sufficient number of angles to give a proper evaluation of the absorption of the radiation throughout an examined slice. The orbital step may be larger or smaller than the fan angle and may be variable in the course of the scan if desired.