Surface and build-up dose comparison between Elekta 6 MV flattening filter and flattening-filter-free beams using an advanced Markus ionization chamber and a solid water-equivalent phantom.
JOURNAL OF APPLIED CLINICAL MEDICAL PHYSICS(2020)
摘要
Using a plane-parallel advanced Markus ionization chamber and a stack of water-equivalent solid phantom blocks, percentage surface and build-up doses of Elekta 6 MV flattening filter (FF) and flattening-filter-free (FFF) beams were measured as a function of the phantom depth for field sizes ranging from 2 x 2 to 10 x 10 cm(2). It was found that the dose difference between the FF and the FFF beams was relatively small. The maximum dose difference between the FF and the FFF beams was 4.4% at a depth of 1 mm for a field size of 2 x 2 cm(2). The dose difference was gradually decreased while the field size was increased up to 10 x 10 cm(2). The measured data were also compared to published Varian FF and FFF data, suggesting that the percentage surface and build-up doses as well as the percentage dose difference between FF and FFF beams by our Elekta linac were smaller than those by the Varian linac.
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关键词
a solid water‐,equivalent phantom,build‐,up,flattening filter (FF) beam,flattening‐,filter‐,free (FFF) beam,ionization chamber,surface dose
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