Breast radiotherapy in the prone position primarily reduces the maximum out-of-field measured dose to the ipsilateral lung

Medical Physics
Stewart J BeckerSilvia C Formenti

Abstract

To quantify the potential advantages of prone position breast radiotherapy in terms of the radiation exposure to out-of-field organs, particularly, the breast or the lung. Several dosimetric studies have been reported, based on commercial treatment planning software (TPS). These TPS approaches are not, however, adequate for characterizing out-of-field doses. In this work, relevant out-of-field organ doses have been directly measured. The authors utilized an adult anthropomorphic phantom to conduct measurements of out-of-field doses in prone and supine position, using 50 Gy prescription dose intensity modulated radiation therapy (IMRT) and 3D-CRT plans. Measurements were made using multiple MOSFET dosimeters in various locations in the ipsilateral lung, the contralateral lung and in the contralateral breast. The closer the organ (or organ segment) was to the treatment volume, the more dose sparing was seen for prone vs supine positioning. Breast radiotherapy in the prone position results in a marked reduction in the dose to the proximal part of the ipsilateral lung, compared with treatment in the conventional supine position. This is true both for 3D-CRT and for IMRT. For IMRT, the maximum measured dose to the lung was reduced f...Continue Reading

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Feb 13, 2016·Strahlentherapie und Onkologie : Organ der Deutschen Röntgengesellschaft ... [et al]·Thomas MulliezLiv Veldeman
Mar 21, 2016·Medical Dosimetry : Official Journal of the American Association of Medical Dosimetrists·Uma GoyalGeorgi N Georgiev
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Apr 8, 2014·Journal of Radiological Protection : Official Journal of the Society for Radiological Protection·Boram LeeMyonggeun Yoon
Aug 9, 2018··William Vladimir Ona Rodriguez, William Vladimir Ona Rodriguez

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