A new method for output factor determination in MLC shaped narrow beams |
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| Institution: | 1. Hospital Universitario Virgen Macarena, Servicio de Radiofísica, Sevilla, Spain;2. Departamento de Fisiología Médica y Biofísica, F. Medicina, Universidad de Sevilla, Spain;3. Deustches Krebsforschungszentrum, Abt. Medizinische Physik, Heidelberg, Germany;4. Departamento de Física de Partículas, Universidade de Santiago de Compostela, Spain;5. Hospital General Universitario, ERESA, Servicio de Radiofísica, Valencia, Spain;1. Dept. for Radiation Oncology, University Hospital of Heidelberg, Heidelberg, Germany;2. Heidelberg Ion Beam Therapy Center (HIT), University Hospital of Heidelberg, Germany;3. German Cancer Research Center (DKFZ), Heidelberg, Germany;1. Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 06351, Republic of Korea;2. Department of Biomedical Engineering, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea;1. Division of Clinical Radiology Service, Okayama Central Hospital, 6-3 Ishimakitacho, kitaku, Okayama 700-0017, Japan;2. Department of Radiation Oncology, Graduate School of Medicine, Kinki University, Osaka, Japan;3. Division of Clinical Radiology Service, Okayama Municipal Hospital, Okayama, Japan;4. Department of Nuclear Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan;5. Department of Radiology, Okayama Central Hospital, Okayama, Japan;6. Department of Radiation Oncology and Image-Applied Therapy, Graduate School of Medicine, Kyoto University, Kyoto, Japan;1. University of Newcastle, Newcastle, New South Wales, Australia;2. University of Sydney, Sydney, New South Wales, Australia;3. Calvary Mater Newcastle, Newcastle, New South Wales, Australia;1. Institute of Medical Physics, School of Physics, Faculty of Science, The University of Sydney, Sydney, New South Wales, Australia;2. Liverpool and Macarthur Cancer Therapy Centres, Liverpool, NSW, Australia;3. Ingham Institute for Applied Medical Research, Sydney, NSW, Australia;4. Laboratory of Radiation Physics, Odense University Hospital, Odense, Denmark;5. Institute of Clinical Research, University of Southern Denmark, Odense, Denmark;6. Illawarra Cancer Care Centre, Wollongong, NSW, Australia;7. Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW, Australia;8. South Western Sydney Clinical School, University of New South Wales, Sydney, NSW, Australia |
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| Abstract: | A new method for the measurement of output factors of narrow beams is presented in this work. By combining a new large area parallel plane ionization chamber (PTW model T34070) with a relative film dosimetry the output factors of small square fields of a 6 MV beam shaped by a MLC were measured. Several detectors (three ionization chambers, two solid state detectors and film) and Monte Carlo simulation were also employed to validate this new methodology and also to determine those detectors more suitable for narrow beam output factor determination.The proposed method for output factor measurement has shown to be in a very good agreement with diamond, diode and Monte Carlo results while it is insensitive to position displacements. Several uncertainties associated to the process of narrow beam dosimetry have also been addressed. |
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