Physics of Medical Imaging

Improving pulse detection in multibin photon-counting detectors

[+] Author Affiliations
Scott S. Hsieh

Stanford University, Department of Radiology, 1201 Welch Road, Stanford, California 94305, United States

Stanford University, Department of Electrical Engineering, 350 Serra Mall, Stanford, California 94305, United States

Norbert J. Pelc

Stanford University, Department of Radiology, 1201 Welch Road, Stanford, California 94305, United States

Stanford University, Department of Bioengineering, 443 Via Ortega, Stanford, California 94305, United States

J. Med. Imag. 3(2), 023505 (Jun 01, 2016). doi:10.1117/1.JMI.3.2.023505
History: Received January 8, 2016; Accepted May 10, 2016
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Abstract.  Energy-discriminating, photon-counting (EDPC) detectors are attractive for their potential for improved detective quantum efficiency and for their spectral imaging capabilities. However, at high count rates, counts are lost, the detected spectrum is distorted, and the advantages of EDPC detectors disappear. Existing EDPC detectors identify counts by analyzing the signal with a bank of comparators. We explored alternative methods for pulse detection for multibin EDPC detectors that could improve performance at high count rates. The detector signal was simulated in a Monte Carlo fashion assuming a bipolar shape and analyzed using several methods, including the conventional bank of comparators. For example, one method recorded the peak energy of the pulse along with the width (temporal extent) of the pulse. The Cramer–Rao lower bound of the variance of basis material estimates was numerically found for each method. At high count rates, the variance in water material (bone canceled) measurements could be reduced by as much as an order of magnitude. Improvements in virtual monoenergetic images were modest. We conclude that stochastic noise in spectral imaging tasks could be reduced if alternative methods for pulse detection were utilized.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Scott S. Hsieh and Norbert J. Pelc
"Improving pulse detection in multibin photon-counting detectors", J. Med. Imag. 3(2), 023505 (Jun 01, 2016). ; http://dx.doi.org/10.1117/1.JMI.3.2.023505


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