Optimal selection of thresholds for photon counting CT

Thomas O'Donnell; Friederike Schoeck; Rabee Cheheltani; David Cormode; Zahi A. Fayad

doi:10.1117/12.2216876

25 March 2016 Optimal selection of thresholds for photon counting CT

Thomas O'Donnell, Friederike Schoeck, Rabee Cheheltani, David Cormode, Zahi A. Fayad

Proceedings Volume 9783, Medical Imaging 2016: Physics of Medical Imaging; 97831P (2016) https://doi.org/10.1117/12.2216876
Event: SPIE Medical Imaging, 2016, San Diego, California, United States

Abstract

Recent advances in Photon Counting CT (PCCT) have facilitated the simultaneous acquisition of multiple image volumes with differing energy thresholds. This presents the user with several choices for energy threshold combinations. As compared to standard clinical Dual kVp CT , where the user typically has only three choices of kVp pairings (e.g., 80/150Sn, 90/150Sn, 100/150Sn), a “quad” PCCT system with 14 threshold settings has Choose(14,4)= 1001 possible threshold combinations (assuming no restrictions). In this paper we describe a computationally tractable means to order, from best (most accurate) to worst (least accurate), threshold combinations for the task of discriminating pure materials of assumed approximate concentrations using the Bhattacharyya Coefficient. We observe that this ordering is not necessarily identical to the ordering for the task of decomposing material mixtures into their components. We demonstrate our approach on phantom data.

Citation Download Citation

Thomas O'Donnell, Friederike Schoeck, Rabee Cheheltani, David Cormode, and Zahi A. Fayad "Optimal selection of thresholds for photon counting CT", Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97831P (25 March 2016); https://doi.org/10.1117/12.2216876

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