Computed tomography scanning method and apparatus wherein exposure of an examining person to scanning radiation is avoided

摘要

In a CT scanning method and apparatus wherein a radiation source is displaced around a system axis and a ray bundle therefrom strikes a detector system that supplies scan data on the basis whereof two-dimensional scan images of the examination subject are determined in an image calculating device, parameters describing the position of a body part of an examining person situated in the beam path are determined by an analysis of registered scan images, and the radiation source is controlled dependent on the analysis result so that the radiation is reduced when the body part is located in the beam path.