A comparison of electronic portal dosimetry verification methods for use in stereotactic radiotherapy |
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| Institution: | 1. Department of Radiation Oncology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands;2. Department of Radiation Oncology, Radboud University Medical Center, Nijmegen, The Netherlands;3. Department of Radiation Oncology, Netherlands Cancer Institute, Amsterdam, The Netherlands;4. Department of Radiation Oncology, Leiden University Medical Centre, Leiden, The Netherlands;1. Department of Radiation Sciences, Umeå University, Sweden;2. Medical Radiation Physics, Department of Immunology, Genetics and Pathology, Uppsala University, Sweden;3. Department of Radiation Physics, Institute of Clinical Sciences, Sahlgrenska Academy, Gothenburg University, Sweden;4. Regional Cancer Center West, Western Sweden Healthcare Region, Göteborg, Sweden;5. Department of Oncology, Linköping University Hospital, Sweden;6. Department of Physics and Biomedical Engineering, Mälar Hospital, Eskilstuna, Sweden;7. Department of Oncology, Sahlgrenska University Hospital, Gothenburg, Sweden;8. Department of Medical Physics, Karolinska University Hospital, Stockholm, Sweden;9. Swedish Radiation Safety Authority, Sweden;10. Department of Oncology and Radiation Physics, Skåne University Hospital, Lund University, Sweden;11. Cureos AB, Uppsala, Sweden;12. Department of Physics and Biomedical Engineering, Sahlgrenska University Hospital, Gothenburg, Sweden;13. Department of Oncology, Örebro University Hospital and Örebro University, Sweden;14. Department of Radiation Physics, Kalmar County Hospital, Sweden;15. Department of Oncology, Karolinska University Hospital, Stockholm, Sweden;1. Department of Radiology, Hospital of the University of Pennsylvania, 3400 Spruce Street, Philadelphia, PA 19104, USA;2. Department of Nuclear Medicine, Odense University Hospital, Søndre Boulevard 29, Odense 5000, Denmark;3. Division of Nuclear Medicine and Molecular Imaging, Geneva University Hospital, CH-1211, Geneva, Switzerland;4. Geneva Neuroscience Center, Geneva University, CH-1211 Geneva, Switzerland;5. Department of Nuclear Medicine and Molecular Imaging, University Medical Center Groningen, University of Groningen, 9700 RB Groningen, The Netherlands;1. Department of Radiation Oncology, Moffitt Cancer Center, Tampa, USA;2. Department of Physics, University of South Florida, Tampa, USA;3. Canis Lupus LLC, Merrimac, USA |
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| Abstract: | Three methods of transit dosimetry using Electronic Portal Imaging Devices (EPIDs) were investigated for use in routine in-vivo dosimetry for cranial stereotactic radiosurgery and radiotherapy. The approaches examined were (a) A full Monte Carlo (MC) simulation of radiation transport through the linear accelerator and patient; (b) Calculation of the expected fluence by a treatment planning system (TPS); (c) Point doses calculated along the central axis compared to doses calculated using parameters acquired using the EPID. A dosimetric comparison of each of the three methods predicted doses at the imager plane to within ±5% and a gamma comparison for the MC and TPS based approaches showed good agreement for a range of dose and distance to agreement criteria. The MC technique was most time consuming, followed by the TPS calculation with the point dose calculation significantly quicker than the other methods. |
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