Phase retrieval in quantitative x-ray microtomography with a single sample-to-detector distance |
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Authors: | Chen R C Xie H L Rigon L Longo R Castelli E Xiao T Q |
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Institution: | Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China. rongchang.chen@gmail.com |
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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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