Patent ID: 7426257

Claim:
A computer tomography method comprising the steps: using a radiation source to generate a cone-shaped beam cluster which passes through an examination area and a periodically moving object which is located in the examination area, producing a relative movement between the radiation source on the one hand and the object located in the examination area on the other hand, where a trajectory, along which the radiation source moves relative to the object, runs on an imaginary cylindrical surface that surrounds the object, using a detector unit to acquire measured values which depend on the intensity in the beam cluster on the other side of the object, during the relative movement, recording the periodic movement of the object during the acquisition, reconstructing a spatial distribution of the absorption of the periodically moving object from the measured values with the aid of the recorded periodic movement of the object, comprising the steps: a) determining the spatial area taken up by the object in the examination area, b) subjecting the measured values to parallel rebinning in order to form a number of groups, where the beams corresponding to the measured values of each group form beam fans which lie in planes that are parallel to one another and to the axis of rotation, c) determining for each group a measured value whose beam irradiates the spatial area taken up by the object, and allocating to the respective group the point in time at which this measured value was acquired, d) determining those groups whose points in time, allocated in step c), lie within periodic, predefined time ranges, e) reconstructing the absorption distribution in the object from the measured values belonging to the groups determined in step d).