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Proceedings Paper

Hybrid EID algorithm for PCD/EID-CT systems
Author(s): Katsuyuki Taguchi; George S. K. Fung; Qiulin Tang; Jochen Cammin
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Paper Abstract

One of the major obstacles toward photon counting detector (PCD)-based clinical x-ray CT systems is the large count rates, because when operated under too intense x-rays, pulse pileup effects (PPEs) due to coincident photons distort the spectrum recorded by PCDs. In this paper we discuss a strategy using a hybrid detector, which consists of PCDs for the central part of the detector [which corresponds to a central small field-of-view (FOV) of the object] and energy integrating detectors (EIDs) for the peripheral part, to achieve the following three goals: 1) to minimize the PPEs; 2) to produce accurate spectral images for the small FOV; and 3) to provide conventional CT images for the entire FOV. The third goal requires a solution to exterior problem, because the central part of EID data is missing. The spectral data obtained by PCDs carry richer information than the intensity data obtained by EIDs; however, performing a simple weighted summation of counts from multi-energy windows of PCD would not produce realistic EID data, as the spectrum recorded by PCD could be skewed by spectral response effects (SREs) and PPEs. We propose a unique approach for the hybrid PCD/EID-CT system in this paper.

Paper Details

Date Published: 19 March 2013
PDF: 7 pages
Proc. SPIE 8668, Medical Imaging 2013: Physics of Medical Imaging, 86682M (19 March 2013); doi: 10.1117/12.2008040
Show Author Affiliations
Katsuyuki Taguchi, Johns Hopkins Univ. School of Medicine (United States)
George S. K. Fung, Johns Hopkins Univ. School of Medicine (United States)
Qiulin Tang, Johns Hopkins Univ. School of Medicine (United States)
Jochen Cammin, Johns Hopkins Univ. School of Medicine (United States)

Published in SPIE Proceedings Vol. 8668:
Medical Imaging 2013: Physics of Medical Imaging
Robert M. Nishikawa; Bruce R. Whiting; Christoph Hoeschen, Editor(s)

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