Feasibility study of using Stereotactic Field Diode for field output factors measurement and evaluating three new detectors for small field relative dosimetry of 6 and 10 MV photon beams
| Autor: | Shigekazu Fukuda, Sikander M. Mirza, Nakaji Taku, Hideyuki Mizuno, M. Basim Kakakhel, Attia Gul |
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| Rok vydání: | 2020 |
| Předmět: |
field output factors
Materials science Field (physics) RAZOR diode RAZOR nano chamber small field dosimetry Linear particle accelerator Square (algebra) 030218 nuclear medicine & medical imaging 03 medical and health sciences Imaging Three-Dimensional 0302 clinical medicine Optics stereotactic field diode Humans Radiation Oncology Physics Dosimetry Radiology Nuclear Medicine and imaging Radiometry PTW31023 Instrumentation Diode Photons Radiation business.industry Detector correction factors 030220 oncology & carcinogenesis Ionization chamber Feasibility Studies Particle Accelerators business Beam (structure) |
| Zdroj: | Journal of Applied Clinical Medical Physics |
| ISSN: | 1526-9914 |
| DOI: | 10.1002/acm2.13007 |
| Popis: | This study assesses the feasibility of using stereotactic field diode (SFD) as an alternate to gaf chromic films for field output factor (FF) measurement and further evaluating three new detectors for small field dosimetry. Varian 21EX linear accelerator was used to generate 6 and 10 MV beams of nominal square fields ranging from 0.5 × 0.5 cm2 to 10 × 10 cm2. One passive (EBT3 films) and five active detectors including IBA RAZOR diode(RD), SFD, RAZOR nanochamber (RNC), pinpoint chamber (PTW31023), and semiflex chamber (PTW31010) were employed. FFs were measured using films and SFD while beam profiles and percentage depth dose (PDD) distribution were acquired with active detectors. Polarity (kpol) and recombination (ks) effects of ion chambers were determined and corrected for output ratio measurement. Correction factors (CF) of RD, RNC, and PTW31023 in axial and radial orientation were also measured. Stereotactic field diode measured FFs have shown good agreement with films (with difference of |
| Databáze: | OpenAIRE |
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