Compensation of nonlinear distortions in photon-counting spectral CT: Deadtime loss, spectral response, and beam hardening effects

J. Cammin, S. Srivastava, Q. Tang, W. C. Barber, J. S. Iwanczyk, N. E. Hartsough, Katsuyuki Taguchi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Photon counting detectors are an emerging technology for spectral computed tomography. They have the potential to improve tissue contrast and specificity, reduce dose, and enable novel applications for K-edge and functional imaging. In this presentation various non-linear distortions were investigated that affect the image quality in photon-counting spectral CT: deadtime losses and spectral response, inherent to the new technology, and beam hardening artifacts that stem from the use of a polychromatic x-ray source. These effects were corrected or compensated for by performing calibration measurements. Techniques from material decomposition were applied to reconstruct images at a desired energy. Two methods were compared to synthesize a single monoenergetic image from photon counting data with multiple energy bins. The parameters were optimized to maximize a given image quality index. The procedures were evaluated on phantom data acquired on an experimental CT scanner with photon-counting detectors with two energy thresholds.

Original languageEnglish (US)
Title of host publicationProgress in Biomedical Optics and Imaging - Proceedings of SPIE
Volume8313
DOIs
StatePublished - 2012
EventMedical Imaging 2012: Physics of Medical Imaging - San Diego, CA, United States
Duration: Feb 5 2012Feb 8 2012

Other

OtherMedical Imaging 2012: Physics of Medical Imaging
CountryUnited States
CitySan Diego, CA
Period2/5/122/8/12

Fingerprint

Nonlinear distortion
spectral sensitivity
Photons
hardening
Hardening
counting
photons
Image quality
Technology
Detectors
Organ Specificity
x ray sources
detectors
Bins
stems
Artifacts
Calibration
scanners
Tomography
artifacts

Keywords

  • beam hardening
  • deadtime losses
  • energy-resolved computed tomography
  • material decomposition
  • photon-counting detectors
  • pulse-pileup
  • spectral CT
  • spectral response

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Radiology Nuclear Medicine and imaging

Cite this

Cammin, J., Srivastava, S., Tang, Q., Barber, W. C., Iwanczyk, J. S., Hartsough, N. E., & Taguchi, K. (2012). Compensation of nonlinear distortions in photon-counting spectral CT: Deadtime loss, spectral response, and beam hardening effects. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE (Vol. 8313). [83131T] https://doi.org/10.1117/12.911217

Compensation of nonlinear distortions in photon-counting spectral CT : Deadtime loss, spectral response, and beam hardening effects. / Cammin, J.; Srivastava, S.; Tang, Q.; Barber, W. C.; Iwanczyk, J. S.; Hartsough, N. E.; Taguchi, Katsuyuki.

Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8313 2012. 83131T.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Cammin, J, Srivastava, S, Tang, Q, Barber, WC, Iwanczyk, JS, Hartsough, NE & Taguchi, K 2012, Compensation of nonlinear distortions in photon-counting spectral CT: Deadtime loss, spectral response, and beam hardening effects. in Progress in Biomedical Optics and Imaging - Proceedings of SPIE. vol. 8313, 83131T, Medical Imaging 2012: Physics of Medical Imaging, San Diego, CA, United States, 2/5/12. https://doi.org/10.1117/12.911217
Cammin J, Srivastava S, Tang Q, Barber WC, Iwanczyk JS, Hartsough NE et al. Compensation of nonlinear distortions in photon-counting spectral CT: Deadtime loss, spectral response, and beam hardening effects. In Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8313. 2012. 83131T https://doi.org/10.1117/12.911217
Cammin, J. ; Srivastava, S. ; Tang, Q. ; Barber, W. C. ; Iwanczyk, J. S. ; Hartsough, N. E. ; Taguchi, Katsuyuki. / Compensation of nonlinear distortions in photon-counting spectral CT : Deadtime loss, spectral response, and beam hardening effects. Progress in Biomedical Optics and Imaging - Proceedings of SPIE. Vol. 8313 2012.
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