Energy Calibration of a CdTe Photon Counting Spectral Detector with Consideration of its Non-Convergent Behavior
AbstractFast and accurate energy calibration of photon counting spectral detectors (PCSDs) is essential for their biomedical applications to identify and characterize bio-components or contrast agents in tissues. Using the x-ray tube voltage as a reference for energy calibration is known to be an efficient method, but there has been no consideration in the energy calibration of non-convergent behavior of PCSDs. We observed that a single pixel mode (SPM) CdTe PCSD based on Medipix-2 shows some non-convergent behaviors in turning off the detector elements when a high enough threshold is applied to the comparator that produces a binary photon count pulse. More specifically, the detector elements are supposed to stop producing photon count pulses once the threshold reaches a point of the highest photon energy determined by the tube voltage. However, as the x-ray exposure time increases, the threshold giving 50% of off pixels also increases without converging to a point. We established a method to take account of the non-convergent behavior in the energy calibration. With the threshold-to-photon energy mapping function established by the proposed method, we could better identify iodine component in a phantom consisting of iodine and other components. View Full-Text
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Lee, J.S.; Kang, D.-G.; Jin, S.O.; Kim, I.; Lee, S.Y. Energy Calibration of a CdTe Photon Counting Spectral Detector with Consideration of its Non-Convergent Behavior. Sensors 2016, 16, 518.
Lee JS, Kang D-G, Jin SO, Kim I, Lee SY. Energy Calibration of a CdTe Photon Counting Spectral Detector with Consideration of its Non-Convergent Behavior. Sensors. 2016; 16(4):518.Chicago/Turabian Style
Lee, Jeong S.; Kang, Dong-Goo; Jin, Seung O.; Kim, Insoo; Lee, Soo Y. 2016. "Energy Calibration of a CdTe Photon Counting Spectral Detector with Consideration of its Non-Convergent Behavior." Sensors 16, no. 4: 518.
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