9 March 2017 Impact of Compton scatter on material decomposition using a photon counting spectral detector
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Abstract
Photon counting spectral detectors are being investigated to allow better discrimination of multiple materials by collecting spectral data for every detector pixel. The process of material decomposition or discrimination starts with an accurate estimation of energy dependent attenuation of the composite object. Photoelectric effect and Compton scattering are two important constituents of the attenuation. Compton scattering while results in a loss of primary photon, also results in an increase in photon counts in the lower ene1rgy bins via multiple orders of scatter. This contribution to each energy bin may change with material properties, thickness and x-ray energies. There has been little investigation into the effect of this increase in counts at lower energies due to presence of these Compton scattered photons using photon counting detectors. Our investigations show that it is important to account for this effect in spectral decomposition problems.
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Cale Lewis, Chan-Soo Park, Nathaniel R. Fredette, Mini Das, "Impact of Compton scatter on material decomposition using a photon counting spectral detector", Proc. SPIE 10132, Medical Imaging 2017: Physics of Medical Imaging, 101323T (9 March 2017); doi: 10.1117/12.2256106; https://doi.org/10.1117/12.2256106
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