SU-D-211-01: Effect of Immobilization/support Devices and Air Gap on Skin Doses for Stereotactic Body Radiotherapy with Abdominal Compression Device

Medical Physics
Y Peng

Abstract

Purpose To evaluate the effects of the couch, the immobilization/support devices, and air gap on the skin dose for SBRT treatment with abdominal compression device and to investigate strategies to minimize skin dose by phantom measurementMaterial and methodsSkin-sparing comes from lower dose in buildup region, anything added between tissue and air may change buildup PDD curve hence skin dose increases. To investigate such effects due to different buildup materials and air gap between the buildup material and the surface, we employed EBT2 film in slab and water phantoms to measure doses at depths varying from surface to dmax, field sizes (4×4 to 10×10 cm(2) ), and air gaps from 5 to 15 cm for 6 MV photons. Measured dose was normalized to dose at dmax for a 10×10 cm(2) field. The buildup materials included table tops (tennis net, Exact Couch and Indexed Immobilization table tops), vacuum bags (Civco Vac-Lok and Med-Tec cushions), and body frames (Elekta stereotactic body frame and Civco Body Pro-Loc). ResultsThe relative doses at depth of 1.00 mm were 0.63 with no buildup, 0.90 with couch+6cm bag, 0.91 with bodyframe+bag, and 0.96 with couch+bodyframe+bag for a 4×4 cm(2) field. With a 10×10 cm(2) field, the above values changed t...Continue Reading

Citations

Aug 3, 2021·Journal of Applied Clinical Medical Physics·Hema Vaithianathan, Benjamin Harris

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