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    Experimental verification the Electron Return Effect around spherical air cavities for the MR Linac using Monte Carlo calculation

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    Authors
    Shortall, J
    Vasquez Osorio, Eliana
    Aitkenhead, Adam H
    Berresford, Joe
    Agnew, James Paul
    Budgell, Geoff J
    Chuter, Robert
    McWilliam, Alan
    Kirkby, Karen J
    Mackay, Ranald I
    van Herk, Marcel
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    Affiliation
    The University of Manchester, Department of Cancer Sciences, Manchester, UK
    Issue Date
    2020
    
    Metadata
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    Abstract
    PURPOSE: Dose deposition around unplanned air cavities during MR Guided Radiotherapy (MRgRT) is influenced by the Electron Return Effect (ERE). This is clinically relevant for gas forming close to or inside Organs At Risk (OAR) that lie in the path of a single beam, e.g. intestinal track during pelvic treatment. This work aims to verify Monte Carlo calculations that predict the dosimetric effects of ERE around air cavities. For this we use GafChromic EBT3 film inside poly-methyl methacrylate (PMMA) -air- PMMA phantoms. METHOD: Four PMMA phantoms were produced. Three of the phantoms contained centrally located spherical air cavities (0.5, 3.5, 7.5 cm diameter), and one phantom contained no air. The phantoms were split to sandwich GafChromic EBT3 film in the centre. The phantoms were irradiated on an Elekta Unity system using a single 10x10 cm2 7 MV photon beam under the influence of a 1.5 T transverse magnetic field. The measurements were replicated using the Elekta Monaco Treatment Planning System (TPS). Gamma analysis with pass criteria 3%/3mm was used to compare the measured and calculated dose distributions. We also consider 3%/2mm, 2%/3mm and 2%/2mm pass criteria for interest. RESULTS: The gamma analysis showed that >95 % of the points agreed between the TPS calculated and measured dose distributions, using 3%/3mm criteria. The phantom containing the largest air cavity had the lowest agreement, with most of the disagreeing points lying inside the air cavity (dose to air region). CONCLUSION: The dose effects due to ERE around spherical air cavities are being calculated in the TPS with sufficient accuracy for clinical use.
    Citation
    Shortall J, Vasquez Osorio E, Aitkenhead A, Berresford J, Agnew J, Budgell G, et al. Experimental verification the Electron Return Effect around spherical air cavities for the MR Linac using Monte Carlo calculation. Med Phys. 2020.
    Journal
    Medical Physics
    URI
    http://hdl.handle.net/10541/622809
    DOI
    10.1002/mp.14123
    PubMed ID
    32145087
    Additional Links
    https://dx.doi.org/10.1002/mp.14123
    Type
    Article
    Language
    en
    ae974a485f413a2113503eed53cd6c53
    10.1002/mp.14123
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