Patent ID: 7656992

Claim:
A method for determining movement and rest phases of a partial object that moves at times in an examination object, the method comprising: scanning the examination object using at least a first and a second x-ray radiation source that rotate around the examination object; using at least one detector in measuring and comparing absorption of the scanning radiation upon passage through the examination object on a same radiation path at successive instants, the at least first and second x-ray radiation sources being used for the comparative measurement, wherein the first x-ray radiation source emitting a first fan beam at a specific rotation angle at a first instant, the absorption of the fan beam being measured in beamwise fashion, the second x-ray radiation source emitting a second fan beam, at the same rotation angle at a second, relatively later instant, the absorption of the second fan beam likewise being measured in beamwise fashion, and wherein at least one of relative movement and relative rest of the partial object, between the first and second instants, is deduced by comparing deviating absorption values of a multiplicity of spatially equivalent and equidirectional fan beams proceeding from a same angular position of the x-ray radiation sources.