Method for correcting a counting rate drift in a quantum-counting detector, X-ray system with quantum-counting detector and circuit arrangement for a quantum-counting detector

摘要

Method for correcting a counting rate drift in a detector for ionizing radiation with a multiplicity of areally arranged quantum counting detector elements (D), each detector element (D) comprising a combination of at least two counters (Z, Z, Z) with significantly different energy thresholds (S1, S2 , S3), which are evaluated in combination to determine an incident radiation dose, and on the basis of previously determined functional dependencies of counting rates among themselves and using at least one of the counters (Z, Z, Z) per detector element as a reference, the count rates of the other counter be corrected with different energy threshold, characterized in that the functional dependencies of the count rates of the individual counters (Z, Z, Z) of each detector element (D) while irradiating the identical or with respect to its absorption properties equivalent material of different thickness, which also in a later X-ray examination in the test object to be examined (7) is at least approximately present, measured and the count rates of the detector elements per energy threshold are attenuation-dependent corrected.