Monte carlo simulation and validation of 6 MV photon beam in various field

This study was carried out to simulate and validate 6 MV photon beam on Elekta Synergy LINAC by using EGSnrc Monte Carlo code for various field sizes. Elekta Synergy treatment head model was established using BEAMnrc/EGSnrc Monte Carlo code. The simulation was conducted in four different field sizes...

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Main Author:	Illias, Nur Asiyah
Format:	Thesis
Language:	English
Published:	2020
Subjects:	R Medicine
Online Access:	http://eprints.usm.my/50791/1/Nur%20Asiyah-24%20pages.pdf
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spelling	my-usm-ep.507912021-11-29T04:52:21Z Monte carlo simulation and validation of 6 MV photon beam in various field 2020-08 Illias, Nur Asiyah R Medicine This study was carried out to simulate and validate 6 MV photon beam on Elekta Synergy LINAC by using EGSnrc Monte Carlo code for various field sizes. Elekta Synergy treatment head model was established using BEAMnrc/EGSnrc Monte Carlo code. The simulation was conducted in four different field sizes, 3 x 3 cm2, 5 x 5 cm2, 7 x 7 cm2 and 10 x 10 cm2. Calculations of depth dose of 6 MV photon beam of four field sizes were performed by using DOSXYZnrc/EGSnrc. The depth dose results obtained from this simulation works were validated by comparing the central axis dose with the ionisation chamber (IC) measurement in a 3D water phantom for the standard field size of 10 cm x 10 cm at SSD 100 cm with less than 2.48% at depth 1.5 cm, 5 cm and 10 cm. The scatter plot of the field size 10 cm x 10 cm is clearly seen and the opening of the jaw is 5 cm for each side from the origin and validated the MLC configuration in the BEAMnrc. The MC model outcome shows that the model is well built and is appropriate design to be use for the dose calculation. The result demonstrated that the Monte Carlo calculation provide a good agreement for the depths beyond depth of maximum dose,dmax = 1.5 cm between the Monte Carlo calculation and IC measurement data for the large field sizes (7 cm x 7 cm and 10 cm x 10 cm) with the percentage difference for the depths 1.5 cm, 5 cm and 10 cm are within ± 2% difference. However, the result shows not a good agreement for the small field sizes (3 cm x 3 cm and 5 cm x 5 cm) were due to loss of the electronic equilibrium, partial occlusion and volume averaging in the small field (6.31% and 9.8% respectively). In conclusion, the EGSnrc Monte Carlo model for the Elekta Synergy LINAC was validated and requires more works on small field radiotherapy. 2020-08 Thesis http://eprints.usm.my/50791/ http://eprints.usm.my/50791/1/Nur%20Asiyah-24%20pages.pdf application/pdf en public masters Universiti Sains Malaysia Pusat Pengajian Sains Perubatan
institution	Universiti Sains Malaysia
collection	USM Institutional Repository
language	English
topic	R Medicine
spellingShingle	R Medicine Illias, Nur Asiyah Monte carlo simulation and validation of 6 MV photon beam in various field
description	This study was carried out to simulate and validate 6 MV photon beam on Elekta Synergy LINAC by using EGSnrc Monte Carlo code for various field sizes. Elekta Synergy treatment head model was established using BEAMnrc/EGSnrc Monte Carlo code. The simulation was conducted in four different field sizes, 3 x 3 cm2, 5 x 5 cm2, 7 x 7 cm2 and 10 x 10 cm2. Calculations of depth dose of 6 MV photon beam of four field sizes were performed by using DOSXYZnrc/EGSnrc. The depth dose results obtained from this simulation works were validated by comparing the central axis dose with the ionisation chamber (IC) measurement in a 3D water phantom for the standard field size of 10 cm x 10 cm at SSD 100 cm with less than 2.48% at depth 1.5 cm, 5 cm and 10 cm. The scatter plot of the field size 10 cm x 10 cm is clearly seen and the opening of the jaw is 5 cm for each side from the origin and validated the MLC configuration in the BEAMnrc. The MC model outcome shows that the model is well built and is appropriate design to be use for the dose calculation. The result demonstrated that the Monte Carlo calculation provide a good agreement for the depths beyond depth of maximum dose,dmax = 1.5 cm between the Monte Carlo calculation and IC measurement data for the large field sizes (7 cm x 7 cm and 10 cm x 10 cm) with the percentage difference for the depths 1.5 cm, 5 cm and 10 cm are within ± 2% difference. However, the result shows not a good agreement for the small field sizes (3 cm x 3 cm and 5 cm x 5 cm) were due to loss of the electronic equilibrium, partial occlusion and volume averaging in the small field (6.31% and 9.8% respectively). In conclusion, the EGSnrc Monte Carlo model for the Elekta Synergy LINAC was validated and requires more works on small field radiotherapy.
format	Thesis
qualification_level	Master's degree
author	Illias, Nur Asiyah
author_facet	Illias, Nur Asiyah
author_sort	Illias, Nur Asiyah
title	Monte carlo simulation and validation of 6 MV photon beam in various field
title_short	Monte carlo simulation and validation of 6 MV photon beam in various field
title_full	Monte carlo simulation and validation of 6 MV photon beam in various field
title_fullStr	Monte carlo simulation and validation of 6 MV photon beam in various field
title_full_unstemmed	Monte carlo simulation and validation of 6 MV photon beam in various field
title_sort	monte carlo simulation and validation of 6 mv photon beam in various field
granting_institution	Universiti Sains Malaysia
granting_department	Pusat Pengajian Sains Perubatan
publishDate	2020
url	http://eprints.usm.my/50791/1/Nur%20Asiyah-24%20pages.pdf
_version_	1747822045940416512

Monte carlo simulation and validation of 6 MV photon beam in various field

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