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Title: Production and dosimetry of simultaneous therapeutic photons and electrons beam by linear accelerator: A Monte Carlo study

Depending on the location and depth of tumor, the electron or photon beams might be used for treatment. Electron beam have some advantages over photon beam for treatment of shallow tumors to spare the normal tissues beyond of the tumor. In the other hand, the photon beam are used for deep targets treatment. Both of these beams have some limitations, for example the dependency of penumbra with depth, and the lack of lateral equilibrium for small electron beam fields. In first, we simulated the conventional head configuration of Varian 2300 for 16 MeV electron, and the results approved by benchmarking the Percent Depth Dose (PDD) and profile of the simulation and measurement. In the next step, a perforated Lead (Pb) sheet with 1mm thickness placed at the top of the applicator holder tray. This layer producing bremsstrahlung x-ray and a part of the electrons passing through the holes, in result, we have a simultaneous mixed electron and photon beam. For making the irradiation field uniform, a layer of steel placed after the Pb layer. The simulation was performed for 10×10, and 4×4 cm2 field size. This study was showed the advantages of mixing the electron and photon beam by reductionmore » of pure electron's penumbra dependency with the depth, especially for small fields, also decreasing of dramatic changes of PDD curve with irradiation field size.« less
Authors:
;  [1] ; ;  [2] ;  [3]
  1. Department of Medical Radiation, Tehran Science and Research Branch, Islamic Azad University, Tehran (Iran, Islamic Republic of)
  2. Department of Radiotherapy, Imam Hossein Hospital, Shahid Beheshti Medical University, Tehran (Iran, Islamic Republic of)
  3. Department of Medical Physics, Hamedan Medical University, Hamedan (Iran, Islamic Republic of)
Publication Date:
OSTI Identifier:
22390996
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1645; Journal Issue: 1; Conference: Carpathian Summer School of Physics 2014, Sinaia (Romania), 13-26 Jul 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; 61 RADIATION PROTECTION AND DOSIMETRY; BENCHMARKS; BREMSSTRAHLUNG; COMPUTERIZED SIMULATION; DEPTH DOSE DISTRIBUTIONS; DOSIMETRY; ELECTRON BEAMS; ELECTRONS; IRRADIATION; LEAD; LINEAR ACCELERATORS; MEV RANGE; MONTE CARLO METHOD; PHOTON BEAMS; PHOTONS