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Sensors 2016, 16(4), 518; doi:10.3390/s16040518

Energy Calibration of a CdTe Photon Counting Spectral Detector with Consideration of its Non-Convergent Behavior

1
Korea Electrotechnology Research Institute, Ansan, Gyeonggi 15588, Korea
2
Department of Biomedical Engineering, Kyung Hee University, Yongin, Gyeonggi 17104, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Vittorio M. N. Passaro
Received: 13 February 2016 / Revised: 22 March 2016 / Accepted: 6 April 2016 / Published: 11 April 2016
(This article belongs to the Section Physical Sensors)
View Full-Text   |   Download PDF [4274 KB, uploaded 11 April 2016]   |  

Abstract

Fast 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
Keywords: photon counting spectral detector; spectral x-ray imaging; tube voltage; Medipix-2; CdTe photon counting spectral detector; spectral x-ray imaging; tube voltage; Medipix-2; CdTe
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

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.

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