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Assessment of the Motorized Wedge of the Compact Accelerator and Comparison with the Dosimetric Charactristics

Behjati, Mahdieh | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45248 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sohrabpour, Mostafa; Bozorgmehri, Ramin
  7. Abstract:
  8. Compact linear accelerator is equipped with a single fixed motorized wedge that produces different wedge angles by combining an open and a wedged field in the appropriate proportions.
    In this work, the required data for the Treatment Planning System, TPS were generated for utilizing Compact motorized wedge, MW and was verified by dosimetry. To verify MW, the accumulated wedge profiles at a depth of 10 cm for different wedge angles were measured using 2-D Profiler and were calculated the wedge angles using an analytical formula. The validity of effective wedge angles 2-D Profiler has been done by determining the wedge angles in accordance with ICRU-24 for compact MW and Telecobalt Physical Wedge, PW. To better evaluated motorized wedge, the planned dose for different wedge angles and field sizes were compared with the measured doses and the differences were found to be less than 3%. The wedge attenuation was determined for each field sizes and the wedge factor dependence on the field size was obtained from a few selected measurements for MW. An analytical model has been developed to calculate wedge dose distribution and isodose curves were obtained from this model. The validity of the analytical model was verified for Compact MW and Telecobalt PW and the relative error was found to be less than 3%
  9. Keywords:
  10. Motorized Wedge ; Wedge Angle ; Isodose Curves ; Beam Profile ; Wedge Factor

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