title: Monte Carlo calculation of Varian 2300C/D Linac photon beam characteristics: a comparison between MCNP4C, GEANT3 and measurements.
abstract: Different codes are used for Monte Carlo (MC) calculations in radiation therapy. In this research, MCNP4C and GEANT3 codes have been compared in calculations of dosimetric characteristics of Varian Clinac 2300C/D. The parameters of influence in the differences seen in dosimetric features were discussed. This study emphasizes that both MCNP4C and GEANT3 MC can be used in radiation therapy computations and their differences in photon spectra calculations have a negligible effect on percentage depth dose computations in radiation therapy.
authors.affiliation: Medical Physics Department, Medical Faculty, Tehran University of Medical Sciences, Tehran, Iran. asgharmesbahi@yahoo.com
authors.forename: Asghar
authors.initials: A
authors.lastname: Mesbahi
authors.forename: Michael
authors.initials: M
authors.lastname: Fix
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Allahverdi
authors.forename: Ellen
authors.initials: E
authors.lastname: Grein
authors.forename: Hossein
authors.initials: H
authors.lastname: Garaati
mesh_terms: D000465:Algorithms; D006801:Humans; D009010:Monte Carlo Method; D017785:Photons; D011829:Radiation Dosage; D011880:Radiotherapy Planning, Computer-Assisted / Q000379:methods*