Feasible Energy Calibration for Multi Multi-Threshold Photon-Counting Counting Detectors Based on Reconstructed XRF Spectra
Abstract: Energy calibration is an important procedure for photon photon-counting counting detectors. In specific, energy calibration allows the connection between detector output and actual energy, and it aligns the uniformity of thresholds and pixels. Some calibration methods involve olve radioactive isotope sources or X X-ray ray kilovoltage peaks (kVp), but these methods are limited because of low availability and poor accuracy. In this study, an optimized method that uses X X-ray ray fluorescence (XRF) emitted from metal compounds as sources is proposed. With a CdZnTe multimulti threshold linear photon-counting counting detector (PCD), experimental results from different data (Kα peaks, Kβ peaks, and Kα and Kβ peaks) and different methods (kVp, XRF, and isotope) are analyzed and compared. A spectrum reconstruction reconstru method known as spectrum stripping is used to verify and reduce the inconsistency problem of the XRF calibration results from the distortion effects in the spectra obtained from the PCDs. Results show that the proposed method shows better accuracy and d more uniform calibration than the methods without spectrum reconstruction.