X-ray position determination apparatus for multi-slice computer tomography system

摘要

The position determination system (50) has an X-ray source (14) with a focal point (60), and at least two rows of detection unit cells (52,54), which are moved along the z axis. The X-ray source produces a X-ray beam along the z axis. The system has a unit for obtaining separate signals from a first detector unit (56) in the first row (52) and from a second detector unit (58) in the second row (54). Also a unit for determining the beam position from the intensities of the separate signals.