Spectral correction algorithm for multispectral CdTe x-ray detectors

Erik Schou Dreier*, Jan Kehres, Mohamad Khalil, Matteo Busi, Yun Gu, Robert Krarup Feidenhans'l, Ulrik Lund Olsen

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Compared to the dual-energy scintillator detectors widely used today, energy-resolved photon-counting x-ray detectors show the potential to improve material identification in various radiography and tomography applications used for industrial and security purposes. However, detector effects, such as charge sharing and photon pileup, distort the measured spectra in pixelated, photon-counting detectors operating under high flux. These effects result in a significant performance degradation of the detectors when used for material identification where accurate spectral measurements are required. We have developed a semianalytical, postdata acquisition, computational algorithm that corrects the measured attenuation curve for severe spectral distortions caused by the detector. The calibration of the algorithm is based on simple attenuation measurements of commercially available materials using standard laboratory sources, enabling the algorithm to be used in any x-ray setup. The algorithm is developed for correcting spectral data acquired with the MultiX ME100 CdTe x-ray detector but could be adapted with small adjustments to other photon-counting, energy-resolved detectors with CdTe sensors. The validation of the algorithm has been done using experimental data acquired with both a standard laboratory source and synchrotron radiation. The experiments show that the algorithm is fast, reliable at x-ray flux up to 5 Mph/s/mm(2) and greatly improves the accuracy of the measured spectrally resolved linear attenuation, making the algorithm useful for both security and industrial applications where photon-counting detectors are used. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Original languageEnglish
Article number054117
JournalOptical Engineering
Volume57
Issue number5
Number of pages13
ISSN0091-3286
DOIs
Publication statusPublished - 2018

Keywords

  • CdTe detectors
  • Compensation of spectral distortions
  • Photon-counting detector
  • MultiX ME100 detector
  • Pulse pileup correction
  • Charge sharing correction

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