Figure 1.

Schematic representation of a CdTe/CZT photon-counting detector. The detector pixels are formed by a strong electric field between the common cathode and the pixelated anodes (indicated by dashed lines) without demarcation by separating layers. In the detector structure shown here, there are four pixels between two collimator blades which serve to suppress scattered radiation. Four data streams per pixel (indicated by colored arrows) correspond to four different threshold energies for counting (and thus four different energy ranges of the registered X-rays). CdTe, cadmium telluride; CZT, cadmium zinc telluride.