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Goal: In K-edge tomographic imaging with photon counting detectors, the energy window width of photon counting detectors significantly affects the signal-to-noise ratio (SNR) of measured intensity data and the contrast-to-noise ratio (CNR) of reconstructed images. In this paper, we present an optimization method to determine an optimal window width around a K-edge for optimal SNR and CNR. Methods:...
Spectral data across energy bins are highly correlated but the signal to noise ratio is generally poor for each energy bin due to the narrow bin width and resultant quantum noise. To address this problem, in this paper we propose a spectral CT reconstruction approach that simultaneously reconstructs x-ray attenuation coefficients in all the energy bins, aided by intra-image sparsity and inter-image...
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