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; K. Taguchi

doi:10.1117/12.911217

3 March 2012 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, K. Taguchi

Author Affiliations +

Proceedings Volume 8313, Medical Imaging 2012: Physics of Medical Imaging; 83131T (2012) https://doi.org/10.1117/12.911217
Event: SPIE Medical Imaging, 2012, San Diego, California, United States

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.

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J. Cammin, S. Srivastava, Q. Tang, W. C. Barber, J. S. Iwanczyk, N. E. Hartsough, and K. Taguchi "Compensation of nonlinear distortions in photon-counting spectral CT: deadtime loss, spectral response, and beam hardening effects", Proc. SPIE 8313, Medical Imaging 2012: Physics of Medical Imaging, 83131T (3 March 2012); https://doi.org/10.1117/12.911217

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