Phantom development for daily checks in electron intraoperative radiotherapy with a mobile linac |
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| Affiliation: | 1. Department of Radiation Oncology, La Fe Polytechnic and University Hospital, Valencia, Spain;2. Department of Physical Therapy, University of Valencia, Spain;3. Department of Electronic Engineering, University of Valencia, Spain;4. Department of Radiation Oncology, Fundación Instituto Valenciano de Oncología, Valencia, Spain;5. PTW Dosimetría Iberia SLU, Spain;1. Department of Medical Physics & Nuclear Medicine, Karolinska University Hospital, S-171 76 Stockholm, Sweden;2. Department of Radiation Physics, Faculty of Health Sciences, Linköping University, S-581 85 Linköping, Sweden;1. KU Leuven, Medical Physics & Quality Assessment Group, Herestraat 49, B-3000 Leuven, Belgium;2. SCK CEN, Radiation Protection Dosimetry and Calibration, Boeretang 200, 2400 Mol, Belgium;3. UZ Gasthuisberg, Department of Radiology, Herestraat 49, B-3000 Leuven, Belgium;1. Department of Electronic Engineering, University of Valencia, E-46100, Spain;2. IRIMED, Unidad Mixta de Investigacion en Radiofisica e Instrumentacion Nuclear en Medicina IIS Hospital La Fe – Universitat de Valencia, Spain;3. S.I.T. – Sordina IORT Technologies SpA, Vicenza, Italy;4. Department of Physical Therapy, University of Valencia, E-46010, Spain;5. Department of Radiation Oncology, La Fe Polytechnic and University Hospital, Valencia E-46026, Spain;1. Nuclear Metrology, Ecole Polytechnique, Université Libre de Bruxelles, Bruxelles, Belgium;2. Radiothérapy Department, Institut Jules Bordet, Bruxelles, Belgium;1. Department of Thoracic and Vascular Surgery, Ghent University Hospital, Ghent, Belgium;2. Department of Surgery, University of Toronto, Toronto, ON, Canada;3. Department of Human Structure and Repair, Ghent University, Ghent, Belgium;4. Department of Work, Organisation and Society, Ghent University, Ghent, Belgium |
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| Abstract: | PurposeIORT with mobile linear accelerators is a well-established modality where the dose rate and, therefore, the dose per pulse are very high. The constancy of the dosimetric parameters of the accelerator has to be checked daily. The aim of this work is to develop a phantom with embedded detectors to improve both accuracy and efficiency in the daily test of an IORT linac at the surgery room.MethodsThe developed phantom is manufactured with transparent polymethyl methacrylate (PMMA), allocating 6 parallel-plate chambers: a central one to evaluate the on-axis beam output, another on-axis one placed at a fixed depth under the previous one to evaluate the energy constancy and four off-axis chambers to evaluate the flatness and symmetry. To analyse the readings a specific application has been developed.ResultsFor all chambers and energies, the mean saturation and polarization corrections were smaller than 0.7%. The beam is monitored at different levels of the clinical beam. Output, energy constancy and flatness correlate very well with the correspondent values with the complete applicator. During the first six months of clinical use the beam dosimetric parameters showed excellent stability.ConclusionsA phantom has been developed with embedded parallel plate chambers attached to the upper applicator part of an IORT linac. The phantom allows a very efficient setup reducing the time to check the parameters. It provides complete dosimetric information (output, energy and flatness) with just one shot and using ionization chambers with minimum saturation effect, as this highly pulsed beam requires. |
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| Keywords: | Intraoperative radiotherapy Electrons Quality assurance Dosimetry |
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