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    Phase unwrapping algorithms for use in a true real-time optical body sensor system for use during radiotherapy.

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    Authors
    Parkhurst, J M
    Price, Gareth J
    Sharrock, Phillip J
    Moore, Christopher J
    Affiliation
    North Western Medical Physics, The Christie NHS Foundation Trust, Manchester, UK. james.parkhurst@physics.cr.man.ac.uk
    Issue Date
    2011-12-10
    
    Metadata
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    Abstract
    An evaluation of the suitability of eight existing phase unwrapping algorithms to be used in a real-time optical body surface sensor based on Fourier fringe profilometry is presented. The algorithms are assessed on both the robustness of the results they give and their speed of execution. The algorithms are evaluated using four sets of real human body surface data, each containing five-hundred frames, obtained from patients undergoing radiotherapy, where fringe discontinuity is significant. We also present modifications to an existing algorithm, noncontinuous quality-guided path algorithm (NCQUAL), in order to decrease its execution time by a factor of 4 to make it suitable for use in a real-time system. The results obtained from the modified algorithm are compared with those of the existing algorithms. Three suitable algorithms were identified: two-stage noncontinuous quality-guided path algorithm (TSNCQUAL)-the modified algorithm presented here-for online processing and Flynn's minimum discontinuity algorithm (FLYNN) and preconditioned conjugate gradient method (PCG) algorithms for enhanced accuracy in off-line processing.
    Citation
    Phase unwrapping algorithms for use in a true real-time optical body sensor system for use during radiotherapy. 2011, 50 (35):6430-9 Appl Opt
    Journal
    Applied Optics
    URI
    http://hdl.handle.net/10541/251861
    DOI
    10.1364/AO.50.006430.
    PubMed ID
    22193118
    Type
    Article
    Language
    en
    ISSN
    1539-4522
    ae974a485f413a2113503eed53cd6c53
    10.1364/AO.50.006430.
    Scopus Count
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