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Phase retrieval in quantitative x-ray microtomography with a single sample-to-detector distance
Authors:Chen R C  Xie H L  Rigon L  Longo R  Castelli E  Xiao T Q
Institution:Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China. rongchang.chen@gmail.com
Abstract:Phase retrieval extracts quantitative phase information from x-ray propagation-based phase-contrast images. Notwithstanding inherent approximations, phase retrieval using a single sample-to-detector distance (SDD) is very attractive, because it imposes no setup complications or additional radiation dose compared to absorption-based imaging. Considering the phase-attenuation duality (ε=δ/β, where ε is constant), a simple absorption correction factor is proposed for the modified Bronnikov algorithm in x-ray propagation-based phase-contrast computed tomography (PPCT). Moreover, a practical method for calculating the optimal ε value is proposed, which requires no prior knowledge of the sample. Tests performed on simulation and experimental data successfully distinguished different materials in a quasihomogeneous and weakly absorbing sample from a single SDD-PPCT data point.
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