Patent ID: 8450695
Filing Date: 2013-05-28
Classification: G01T

Abstract:
1. A circuit arrangement for counting X-ray radiation X-ray quanta in detector elements in a detector in an emitter-detector system of an X-ray CT system, the X-ray radiation including a multiplicity of X-ray quanta that can have a maximum energy and wherein the X-ray quanta registered in each detector element generate a signal profile with X-ray-quanta-energy-dependent voltage pulses with different heights, which may be superposed on one another, the circuit arrangement, in each detector element, comprising: at least one first comparator with a first energy threshold less than or equal to the maximum X-ray-quantum energy; and at least one second comparator with a second energy threshold greater than the maximum X-ray-quantum energy, the at least one first comparator and at least one second comparator being connected to the detector element, wherein the at least one first comparator and at least one second comparator each respectively generate a comparator output signal if their respective energy threshold is exceeded, the at least one first comparator and at least one second comparator including a logical interconnection, wherein at least a first comparator and a second comparator of the at least one first comparator and at least one second comparator are connected to the inputs of an XOR gate, and each XOR gate connected to the first comparator is connected to precisely one counter.