Polarized dosimetry method for Gafchromic EBT3 |
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| Institution: | 1. Radiation Medicine Program, Princess Margaret Cancer Centre, Toronto, Ontario, Canada;2. Institute of Medical Science, University of Toronto, Toronto, Ontario, Canada;3. Department of Radiation Oncology, University of Michigan, Ann Arbor, Michigan;1. Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, BE-2400 Mol, Belgium;2. Medical Physics Department,Veneto Institute of Oncology IOV-IRCCS, Via Gattamelata 64, 35128 Padova, Italy;3. Institut de Radioprotection et de Sûreté Nucléaire (IRSN), BP17, 92262 Fontenay-aux-Roses Cedex, France;4. VINCA Institute of Nuclear Sciences (VINCA), University of Belgrade, P.O. Box 522, 11001 Belgrade, Serbia;5. Istituto Superiore di Sanità (ISS), Viale Regina Elena 299, 00161 Rome, Italy;6. Nofer Institute of Occupational Medicine, 8 Sw. Teresy, Str., 91-348 ?ód?, Poland;7. Radiation and Nuclear Safety Authority (STUK), P.O. Box 14, 00881 Helsinki, Finland;8. Institute of Nuclear Physics (IFJ – PAN), ul Radzikowskiego 152, PL-31-342 Kraków, Poland;9. Ru?er Bo?kovi? Institute (RBI), Bijeni?ka c. 54, 10000, Zagreb, Croatia;10. Centre Hospitalier Universitaire de Liège (CHUL)/Zephyra scrl, Avenue de l''Hôpital, 4000 Liège, Belgium;11. National Radiation Protection Institute (NRPI), Barto?kova 28, 140 00 Prague 4, Czech Republic;12. Udine University Hospital (AOUD), pl S. Maria della Misericordia, 15, 33100 Udine, Italy |
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| Abstract: | PurposeTo analyze the changes in the polarization state of the flatbed scanner light caused by the EBT3 films and to propose a new method for correcting the lateral effects.Methods and materialsThe polarization changes induced by radiochromic films are analyzed using linear polarizing film. Based on the results, the linear polarizing films are used in the scanning process of the EBT3 films. This method is tested against the conventional EBT3 dosimetry using a series of simple regular beams and 21 cases of IMRT.ResultsThe mean results are statically different from the conventional dosimetry with EBT3. Depending on the transmission axis of the polarizing sheet, the results are better or worse compared to conventional dosimetry EBT3 film. When the transmission axis of the polarizing sheet is parallel to the coating direction, the dosimetry results are better and its variability is smaller. However, when the polarizer transmission axis is perpendicular to the coating direction, results are worse as well as its variability.ConclusionUsing a polarized film with the polarization axis parallel to the coating direction of the radiochromic film, and preferably above it, significantly improves the dosimetry results and is an easy and inexpensive way to correct the lateral artifacts of the conventional EBT3 dosimetry. |
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| Keywords: | Radiochromic film dosimetry Lateral correction Light polarization |
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