Pencil‐Beam Fluence Evaluation Based on Monte Carlo Simulations Algorithm of High Energetic Treatment Photons
Author(s):
Article Type:
Research/Original Article (دارای رتبه معتبر)
Abstract:
The accurate calculation of doses during external radiotherapy sessions is necessary. Recently, the models used for this purpose have been the point kernel, pencil‑beam, and collapsed cone superposition/convolution combination models. In this study, it is aimed to determine point/pencil‑beam kernels to be used in dose calculations. For this purpose, tallying pencil‑beam fluence based on Monte Carlo (MC) simulations is investigated by scoring a volume of interest centered in a cubic water phantom at a depth of 10 cm and the irradiated feld of 10 cm × 10 cm. The fluence is calculated for each mono‑energetic photon ranging from 0.256 MV at increments of 250 keV. The output of the four fluence kernels along the depth Z around the central axis is categorized for both the primary and secondary photons and electrons. Here, a database for pencil‑beam kernels is established for each category. For validation purposes, other MC simulations are carried out for fluence calculations as produced by the predetermined poly‑energetic spectra for a Varian 6 MV linear accelerator. The net results show a good ft of the two convoluted fluence spectra quantities for both mono‑energetic and poly‑energetics‑based simulations except little singular peaks.
Keywords:
Language:
English
Published:
Journal of Medical Signals and Sensors, Volume:8 Issue: 2, Apr-Jun 2018
Pages:
81 to 86
magiran.com/p1832711
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