期刊
OPTICS LETTERS
卷 36, 期 9, 页码 1719-1721出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.36.001719
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资金
- National Basic Research Program (973 Program) [2010CB834301]
- Chinese Academy of Sciences [GJHZ09058]
- Abdus Salam International Centre for Theoretical Physics
- INFN-Fondo Affari Internazionali
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 (epsilon = delta/beta, where epsilon 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 epsilon 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. (C) 2011 Optical Society of America
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