Quality assurance of Siemen's virtual wedgeTMby using film dosimetry |
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| Affiliation: | 1. School of Ocean and Earth Science, University of Southampton, National Oceanography Centre, European Way, Southampton SO14 3ZH, UK;2. British Antarctic Survey, Cambridge CB3 0ET, UK;3. Plymouth Marine Laboratory, Plymouth PL1 3DH, UK;4. Bangor University, Bangor LL57 2DG, UK;5. Rutgers University, NJ, USA |
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| Abstract: | A film dosi netry method is proposed for measuring the non-uniform dose distribution generated by Virtual Wedges of a 6 MV Siemens Pr mus accelerator. This method was chosen due to the dose integration capabilities and the improved spatial resolution that films offer, giving the opportunity of measuring dose distribution in a single beam irradiation. Dose profiles were obtained and analyzed using a 16-bit Vidar film scanner and OmniPro-Accept software. Results were compared with corresponding ones measured with an array ionization chamber for both virtual and conventional wedges. A good agreement was found between the two methods for all the examined wedge angles. This study shows that film, dosimetry can be incorporated in a monthly quality asseurance program for virtual wedges in order to reduce the required effort. |
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