Computer tomography device with conical radiation beam and helical scan path; has defined geometric arrangement of radiation source to edges of detection window, to form relative motion helix

摘要

The device has a scanning unit, a drive arrangement and a reconstruction unit, to reconstruct the spatial distribution of absorption from the data acquired with a detector window defined by a helix (17) that describes the relative motion of the drive unit. The lines joining the radiation source to both edges of the detection window, which are mutually offset in the direction of the rotation axis (14), intersect two offset sections of the helix. The lines joining the radiation source to both edges of the detection window, which are mutually offset in the direction of the rotation axis (14), intersect two sections of the helix offset by (2n+1)p, where n is an integer - one and p is the axial offset of two adjacent helix coils.