title: Phase retrieval in quantitative x-ray microtomography with a single sample-to-detector distance.
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.
authors.affiliation: Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China. rongchang.chen@gmail.com
authors.forename: R C
authors.initials: RC
authors.lastname: Chen
authors.forename: H L
authors.initials: HL
authors.lastname: Xie
authors.forename: L
authors.initials: L
authors.lastname: Rigon
authors.forename: R
authors.initials: R
authors.lastname: Longo
authors.forename: E
authors.initials: E
authors.lastname: Castelli
authors.forename: T Q
authors.initials: TQ
authors.lastname: Xiao