Design, fabrication, and validation of a polymethyl methacrylate head phantom for dosimetric verification of cranial radiotherapy treatment plans
| Autor: | Raghuram K Nair, K V Rajasekhar, Rajesh Kumar, Saju Bhasi, V S Shaiju, George Zacharia, Debjani Phani |
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| Rok vydání: | 2020 |
| Předmět: |
point dose
lcsh:Medical physics. Medical radiology. Nuclear medicine Materials science Fabrication Dosimeter Optically stimulated luminescence Polymethyl methacrylate lcsh:R895-920 Biophysics Imaging phantom 030218 nuclear medicine & medical imaging 03 medical and health sciences 0302 clinical medicine 030220 oncology & carcinogenesis Ionization chamber gamma analysis Head (vessel) Original Article Radiology Nuclear Medicine and imaging Radiation treatment planning head phantom Biomedical engineering |
| Zdroj: | Journal of Medical Physics, Vol 45, Iss 2, Pp 66-70 (2020) Journal of Medical Physics |
| ISSN: | 0971-6203 |
| Popis: | Purpose: The present study aims to design and fabricate a novel, versatile, and cost-effective Polymethyl Methacrylate (PMMA) head phantom for the dosimetric pretreatment verification of radiotherapy (RT) treatment plans. Materials and Methods: The head phantom designing involves slice-wise modeling of an adult head using PMMA. The phantom has provisions to hold detectors such as ionization chambers of different sizes, Gafchromic films, gel dosimeter, and optically stimulated luminescence dosimeter. For the point dose verification purpose, 15 volumetric modulated arc therapy patient plans were selected, and doses were measured using a CC13 ionization chamber. The percentage gamma passing rate was calculated for acceptance criteria 3%/3 mm and 2%/2 mm using OmniPro I’mRT film QA software, and Gafchromic EBT3 films were used for 2D planar dose verification. Results: Treatment planning system calculated, and the measured point doses showed a percentage deviation ranged from 0.26 to 1.92. The planar dose fluence measurements, for set acceptance criteria of 3%/3 mm and 2%/2 mm, percentages of points having gamma value |
| Databáze: | OpenAIRE |
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