Please use this identifier to cite or link to this item: https://hdl.handle.net/1959.11/3459
Title: Analyser-based phase-contrast image reconstruction using geometrical optics
Contributor(s): Kitchen, M J (author); Pavlov, Konstantin M  (author)orcid ; Siu, K K W (author); Menk, R H (author); Tromba, G (author); Lewis, R A (author)
Publication Date: 2007
DOI: 10.1088/0031-9155/52/14/010
Handle Link: https://hdl.handle.net/1959.11/3459
Abstract: Analyser-based phase contrast imaging can provide radiographs of exceptional contrast at high resolution (<100 μm), whilst quantitative phase and attenuation information can be extracted using just two images when the approximations of geometrical optics are satisfied. Analytical phase retrieval can be performed by fitting the analyser rocking curve with a symmetric Pearson type VII function. The Pearson VII function provided at least a 10% better fit to experimentally measured rocking curves than linear or Gaussian functions. A test phantom, a hollow nylon cylinder, was imaged at 20 keV using a Si(1 1 1) analyser at the ELETTRA synchrotron radiation facility. Our phase retrieval method yielded a more accurate object reconstruction than methods based on a linear fit to the rocking curve. Where reconstructions failed to map expected values, calculations of the Takagi number permitted distinction between the violation of the geometrical optics conditions and the failure of curve fitting procedures. The need for synchronized object/detector translation stages was removed by using a large, divergent beam and imaging the object in segments. Our image acquisition and reconstruction procedure enables quantitative phase retrieval for systems with a divergent source and accounts for imperfections in the analyser.
Publication Type: Journal Article
Source of Publication: Physics in Medicine and Biology, 52(14), p. 4171-4178
Publisher: Institute of Physics Publishing Ltd
Place of Publication: United Kingdom
ISSN: 1361-6560
0031-9155
Fields of Research (FoR) 2008: 020504 Photonics, Optoelectronics and Optical Communications
080110 Simulation and Modelling
Socio-Economic Objective (SEO) 2008: 861503 Scientific Instruments
861502 Medical Instruments
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Science and Technology

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