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
| Autor: | Shigeharu Takenaka, Toshikazu Imae, Kanako Matsuda, Keiichi Nakagawa, Atsushi Aoki, Yuichi Watanabe, Katsutake Sasaki, Kanabu Nawa, Shigeki Saegusa, Osamu Abe |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Water equivalent Imaging phantom Linear particle accelerator 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine Optics ionization chamber Field size Technical Note Humans Radiology Nuclear Medicine and imaging Instrumentation Photons Radiation Flattening filter free business.industry build‐up flattening‐filter‐free (FFF) beam Phantoms Imaging Dose comparison Water Radiotherapy Dosage a solid water‐equivalent phantom 030220 oncology & carcinogenesis Ionization chamber Maximum dose Technical Notes Particle Accelerators business surface dose flattening filter (FF) beam |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| Popis: | 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 × 2 to 10 × 10 cm2. 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 × 2 cm2. The dose difference was gradually decreased while the field size was increased up to 10 × 10 cm2. 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. |
| Databáze: | OpenAIRE |
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