Dosimetric impact of failing to apply correction factors to ion recombination in percentage depth dose measurements and the volume-averaging effect in flattening filter-free beams |
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| Institution: | 1. Medical Physics and Radiation Protection Service, Hospital Universitario de Fuenlabrada, C/ Camino del Molino 2, 28492 Fuenlabrada, Madrid, Spain;2. Department of Medicine and Public Health, Rey Juan Carlos University, Alcorcón, Spain;3. Medical Physics Group, Department of Radiology, University Complutense of Madrid, 28040 Madrid, Spain;1. Royal Brisbane and Women’s Hospital, Butterfield Street, Herston, QLD 4029, Australia;2. Queensland University of Technology, 2 George Street, Brisbane, QLD 4000, Australia;1. Department of Radiation Oncology, Medical University Vienna, Austria;2. Division of Radiation Therapy, Department of Diagnostic and Therapeutic Radiology, Faculty of Medicine Ramathibodi Hospital, Mahidol University, Bangkok, Thailand;3. University of Applied Science Wiener, Neustadt, Austria;4. MedAustron Ion Therapy Center, Wiener Neustadt, Austria;1. School of Science, RMIT University, Melbourne, Australia;2. The European Synchrotron Radiation Facility, ID17 Biomedical Beamline, Grenoble, France;3. Inserm UA7 STROBE, Grenoble Alps University, Grenoble, France;4. Swansea University Medical School, Singleton Park, Swansea, United Kingdom;5. Radiation Oncology, Alfred Hospital, Melbourne, Australia;6. School of Health and Biomedical Sciences, RMIT University, Melbourne, Australia;7. Physical Sciences, Peter MacCallum Cancer Centre, Melbourne, Australia;8. Australian Nuclear Science and Technology Organisation (ANSTO), Australian Synchrotron, Clayton, Australia;9. Department of Obstetrics and Gynaecology, University of Melbourne, Royal Women’s Hospital, Melbourne, Australia;10. Australian Radiation Protection and Nuclear Safety Agency (ARPANSA), Melbourne, Australia;11. Radiation Analytics, Brisbane, Australia;1. Department of Radiation Oncology, Tohoku University Graduate School of Medicine, Miyagi, Japan;2. Department of Radiology, Center Hospital of National Center for Global Health and Medicine, Tokyo, Japan;3. Tokyo Metropolitan Cancer and Infectious Diseases Center Komagome Hospital, Tokyo, Japan;4. Department of Radiology, Ishinomaki Red-Cross Hospital, Miyagi, Japan;5. Course of Radiological Technology, Health Sciences, Tohoku University Graduate School of Medicine, Sendai, Miyagi, Japan |
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| Abstract: | PurposeTo examine whether it is essential to apply correction factors for ion recombination (kS) to percentage depth dose (PDD) measurements and to the volume-averaging effect (kvol) to ensure accurate absolute dose calibration for flattening filter-free (FFF) beams for the most commonly used ionization chambers.MethodsWe surveyed medical physicists worldwide (n = 159) to identify the five most common ionization chamber combinations used for absolute and relative reference dosimetry of FFF beams. We then assessed the overall absolute dose calibration error for FFF beams of the Artiste Siemens and TrueBeam Varian linear accelerators resulting from failing to apply correction factors kS in the PDD(10) and the volume-averaging effect (kvol) to such chamber combinations.ResultsAll the chamber combinations examined—the Farmer PTW 30013 ionization chamber used for absolute dosimetry, and the PTW 31010, PTW 30013, IBA CC04, IBA CC13, and PTW 31021 ionization chambers used for PDD curves measurements—showed non-negligible errors (≥0.5%). The largest error (1.6%) was found for the combination of the Farmer PTW 30013 chamber with the IBA CC13 chamber, which was the most widely used chamber combination in our survey.ConclusionsBased on our findings, we strongly recommend assessing the impact of failing to apply correction factors kS in the PDD(10) and kvol prior to using any chamber type for FFF beam reference dosimetry purposes. |
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| Keywords: | Flattening-filter-free beams (FFF) FFF reference dosimetry PDD(10) Survey |
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