Detective quantum efficiency of a dual-energy photon-counting X-ray detector with charge sharing compensation
Abstract
Abstract Photon-counting detectors (PCDs) are an attractive technology; they provide multiple- or dual-energy (DE) images after a single X-ray exposure. We evaluated the fundamental imaging performance of a CdTe-based DE PCD embedded with an optional anticoincidence (AC) function that aggregates the signals spread over neighboring pixels and casts this sum to the pixel that represents the highest signal. Furthermore, we compared the performance of this CdTe-based DE PCD with conventional flat-panel detectors (FPDs) using the same X-ray spectrum (70 kV and 21-mm aluminum filtration). The AC option improves the modulation-transfer function of the PCD by suppressing the possible double counting induced by a Cd or Te K-edge characteristic X-ray photon, which causes a count in a pixel in the proximity of the photoelectric event. These characteristic X-ray interactions correlate between low- and high-energy images, resulting in a cross noise-power spectrum (NPS) whose magnitude decreases with increasing spatial frequency. In contrast, the AC option produces an uncorrelated NPS. The detective quantum efficiencies (DQEs) of the DE PCD with AC-off and -on were identical, when the cross-NPS was compensated for, to those for the images obtained by summing low- and high-energy images. Furthermore, the DQE performance of the PCD was not degraded upon lowering the air kerma levels and even dominated that of the FPDs.
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