Pencil‑Beam Fluence Evaluation Based on Monte Carlo Simulations Algorithm of High Energetic Treatment Photons
DOI: 10.4103/jmss.JMSS_48_17
Abstract
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 0.25–6 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
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