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• W1483171472 abstract "Intensity modulated radiation therapy (IMRT) is a fairly new modality in the treatment of cancer with radiotherapy. The original idea is Swedish and has existed for more than 20 years. But it is only in recent years that clinics have implemented the IMRT technique. IMRT uses many segments (small subfields) that build up radiation fields with nonuniform energy fluence. With this technique, better target conformity can be achieved and the absorbed dose to healthy tissues in the vicinity of the tumour can be limited. The purpose of this work is to find a reliable method to verify IMRT delivery, which can lead to commissioning of the IMRT technique at Lund University Hospital. The dosimetric equipment chosen to verify the IMRT delivery has been radiographic film, complemented with ion chamber measurements for absolute dose determination.The verification has been performed on a phantom case, which is part of the QUASIMODO project used as an external audit of our dosimetric system. Additionally, a clinically patient case was also verified. Both treatment plans were optimized in the Oncentra Treatment Planning (OTP) system and forward calculated in Helax-TMS.The EDR2 film from Kodak is a rather new type of radiographic film that has been used throughout this study. It was shown that the EDR2 film could accurately be used, within 2%, for relative as well as absolute dose measurements, down to a depth in the patient/phantom of at least 20 cm, when ignoring the build-up region. Absolute dose measurements with a cylindrical ion chamber (NE 2571 0.6 cm3 Farmer type) showed, on the other hand, discrepancies up to 8% when compared to calculations by the treatment planning system (TPS). The reason for this might be due to partial irradiation of the ion chamber in IMRT. Thermoluminescent dosimeters (TLD) were used as an alternative detector for comparison and the result was within 2% of the TPS calculations.With proper care the film dosimetry can be used to verify IMRT delivery. But before that, the large discrepancies with ion chamber measurements have to be further investigated. Many more cases have to be verified to get a better statistical base." @default.
• W1483171472 created "2016-06-24" @default.
• W1483171472 creator A5008857137 @default.
• W1483171472 date "2004-01-01" @default.
• W1483171472 modified "2023-09-27" @default.
• W1483171472 title "Dosimetric Verification of Intensity Modulated Radiotherapy Treatment Plans with Radiographic Film" @default.
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