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. 2023 Aug 22;308(2):e230344. doi: 10.1148/radiol.230344

Figure 7:

Top views of (A) current CT detectors and (B) photon-counting detectors (PCDs) with different pixel sizes. (A) With reflectors (gray) thickness being fixed, current CT detectors with smaller pixels (yellow squares) have worse geometrical efficiency than detectors with larger pixels due to the increased dead space in between detectors. (B) In contrast, because reflectors are not necessary in PCDs, smaller pixel sizes do not accompany larger areas of reflector dead space, effectively rendering 100% geometric efficiencies.

Top views of (A) current CT detectors and (B) photon-counting detectors (PCDs) with different pixel sizes. (A) With reflectors (gray) thickness being fixed, current CT detectors with smaller pixels (yellow squares) have worse geometrical efficiency than detectors with larger pixels due to the increased dead space in between detectors. (B) In contrast, because reflectors are not necessary in PCDs, smaller pixel sizes do not accompany larger areas of reflector dead space, effectively rendering 100% geometric efficiencies.