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19 March 2014Effects of energy-bin acquisition methods on noise properties in photon-counting spectral CT
Spectral CT with photon-counting detectors has the potential to improve material decomposition and contrastto-
noise ratio (CNR) compared to conventional CT. This work compared the noise properties of two general
energy-bin acquisition methods: (1) energy bins acquired from the same spectrum noise realization, and (2)
energy bins acquired from different spectrum noise realizations. For both types of acquisitions, the detected
number of counts per bin was simulated and measured on a bench-top system. The energy-bin noise standard
deviation was compared for both acquisition methods. Simulations were performed to compare both methods
with respect to noise in material decomposition estimates and the CNR in image-based weighted images. Both
the experimental and simulation results indicated increased energy-bin noise when energy measurements were
acquired from different spectrum realizations. The noise increased by a factor of 2 for the lowest energy bin,
with the noise penalty decreasing with increasing bin energy. The simulation results demonstrated a factor of 1.2
to 2 increase in noise in material decomposition estimates when acquiring from different spectrum realizations.
Despite the increased energy-bin noise, energy measurements from different spectrum realizations increased
the CNR in image-based-weighted images by 10%, potentially due to noise correlations across bins. Overall,
the investigated acquisition methods demonstrated differences in noise standard deviation, affecting material
decomposition estimates and CNR.
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Taly Gilat Schmidt, Kevin C. Zimmerman, Emil Y. Sidky, "Effects of energy-bin acquisition methods on noise properties in photon-counting spectral CT," Proc. SPIE 9033, Medical Imaging 2014: Physics of Medical Imaging, 90331B (19 March 2014);