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    An analysis of breast motion using high-frequency, dense surface points captured by an optical sensor during radiotherapy treatment delivery.

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    Authors
    Price, Gareth J
    Sharrock, Phillip J
    Marchant, Thomas E
    Parkhurst, J M
    Burton, D
    Jain, Pooja
    Price, Patricia M
    Moore, Christopher J
    Affiliation
    North Western Medical Physics, The Christie NHS Foundation Trust, Manchester, UK. Gareth.Price@physics.cr.man.ac.uk
    Issue Date
    2009-11-07
    
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    Abstract
    Patient motion is an important factor affecting the quality of external beam radiotherapy in breast patients. We analyse the motion of a dense set of surface points on breast patients throughout their treatment schedule to assess the magnitude and stability of motion, in particular, with respect to breast volume. We use an optical sensor to measure the surface motion of 13 breast cancer patients. Patients were divided into two cohorts dependent upon breast volume. Measurements were made during radiotherapy treatment beam delivery for an average of 12 fractions per patient (total 158 datasets). The motion of each surface point is parameterized in terms of its period, amplitude and relative phase. Inter-comparison of the motion parameters across treatment schedules and between patients is made through the creation of corresponding regions on the breast surfaces. The motion period is spatially uniform and is similar in both patient groups (mean 4 s), with the small volume cohort exhibiting greater inter-fraction period variability. The mean motion amplitude is also similar in both groups with a range between 2 mm and 4 mm and an inter-fraction variability generally less than 1 mm. There is a phase lag of up to 0.4 s across the breast, led by the sternum. Breast patient motion is reasonably stable between and during treatment fractions, with the large volume cohort exhibiting greater repeatability than the small volume one.
    Citation
    An analysis of breast motion using high-frequency, dense surface points captured by an optical sensor during radiotherapy treatment delivery. 2009, 54 (21):6515-33 Phys Med Biol
    Journal
    Physics in Medicine and Biology
    URI
    http://hdl.handle.net/10541/109239
    DOI
    10.1088/0031-9155/54/21/005
    PubMed ID
    19826200
    Type
    Article
    Language
    en
    ISSN
    1361-6560
    ae974a485f413a2113503eed53cd6c53
    10.1088/0031-9155/54/21/005
    Scopus Count
    Collections
    All Christie Publications
    Christie Medical Physics and Engineering Research
    Academic Department of Radiation Oncology - ADRO

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