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Dose Simulation in Different Body Parts in Radiotherapy Using BEAM Monte Carlo Code on Human Phantom and Bench-Marking with TL Dosimetry

Mirzapour, Meqdad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42033 (46)
  4. University: Sharif University of Technology
  5. Department: Energy Engineering
  6. Advisor(s): Sohrabpour, Moustafa; Mahdavi, Rabi
  7. Abstract:
  8. In this thesis the calculated dose by corePLAN treatment planning software is compared with the calculated dose from combining BEAMnrc and DOSXYZnrc Monte Carlo codes. First Varian Clinic 2100c/d linear accelerator was simulated and modeling parameters such as electron beam energy and its spatial distribution FWHM were tuned in order for PDD and dose profile curves to have an agreement with less than 2% error with the ion chamber dosimetry. In the second section the derived X-ray beams from the accelerator head simulations were used to calculate dose in different organs of a RANDO phantom. The female RANDO phantom was simulated based on its CT data using DOSXYZnrc code. The CT files of the phantom were transformed into a compatible format with DOSXYZnrc using ctcreate software. Then the treatment plans for head, neck, abdomen and pelvis were created using CorePLAN software. By applying these plans to DOSXYZnrc program their dose was calculated and was compared with ETAR algorithm. By choosing 18.2 MeV and 1.5 mm parameters for the electron beam the error between Monte Carlo and dosimetry is less 1% and 2mm. The comparison between ETAR and Monte Carlo method proved that in homogeneous organs which are equivalent to water such as pelvis and abdomen both algorithms have good agreement. The largest error was about 3% and was in sections such as bones and marrow. But in organs such as head and neck which are highly inhomogeneous this difference increases. In all the simulated organs the marrow dose calculated by ETAR algorithm is less than its real value and the most dominant error belongs to neck and is about 10 to 12 percent.

  9. Keywords:
  10. Monte Carlo Method ; Equivalent-Man Phantom ; ETAR Algorithm ; BEAMnrc Code ; DOSXYZnrc Code ; Core PLAN ; Varian Accelerator

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