@inproceedings{8b242b1d22c64230ac1db2f1c7e929d9,
title = "Compensation of nonlinear distortions in photon-counting spectral CT: Deadtime loss, spectral response, and beam hardening effects",
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.",
keywords = "beam hardening, deadtime losses, energy-resolved computed tomography, material decomposition, photon-counting detectors, pulse-pileup, spectral CT, spectral response",
author = "J. Cammin and S. Srivastava and Q. Tang and Barber, \{W. C.\} and Iwanczyk, \{J. S.\} and Hartsough, \{N. E.\} and K. Taguchi",
year = "2012",
doi = "10.1117/12.911217",
language = "English",
isbn = "9780819489623",
series = "Progress in Biomedical Optics and Imaging - Proceedings of SPIE",
booktitle = "Medical Imaging 2012",
note = "Medical Imaging 2012: Physics of Medical Imaging ; Conference date: 05-02-2012 Through 08-02-2012",
}