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Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation

In this work, soft‐tissue equivalence of water, polystyrene, PMMA and water equivalence of polystyrene, and PMMA has been assessed for multiple megavoltage photon beams and field sizes. EGSnrc based Monte Carlo (MC) codes, BEAMnrc and DOSXYZnrc are used for the linac head modeling and the phantom do...

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Autores principales: Aslam, Ambreen, Kakakhel, Muhammad Basim, Shahid, Shaukat Ali, Younas, Lubna, Zareen, Sobia
Formato: Online Artículo Texto
Lenguaje:English
Publicado: John Wiley and Sons Inc. 2016
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5690209/
https://www.ncbi.nlm.nih.gov/pubmed/26894338
http://dx.doi.org/10.1120/jacmp.v17i1.5700
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author Aslam, Ambreen
Kakakhel, Muhammad Basim
Shahid, Shaukat Ali
Younas, Lubna
Zareen, Sobia
author_facet Aslam, Ambreen
Kakakhel, Muhammad Basim
Shahid, Shaukat Ali
Younas, Lubna
Zareen, Sobia
author_sort Aslam, Ambreen
collection PubMed
description In this work, soft‐tissue equivalence of water, polystyrene, PMMA and water equivalence of polystyrene, and PMMA has been assessed for multiple megavoltage photon beams and field sizes. EGSnrc based Monte Carlo (MC) codes, BEAMnrc and DOSXYZnrc are used for the linac head modeling and the phantom dose calculations, respectively. Percentage depth doses (PDDs) are scored for two field sizes ([Formula: see text] , [Formula: see text]) and photon energies (6 MV and 10 MV) in water, polystyrene, PMMA, and soft tissue. The comparisons of PDDs show that soft‐tissue equivalence of various materials varies with the depth in the phantom, field size, and photon energy. Water and PMMA are found to be the closest soft‐tissue and water substitutes, respectively. Soft‐tissue and water equivalence of dosimetry materials need to be evaluated for a range of photon energies and field sizes before their application in complex radiation beams. PACS numbers: 87.55.Gh, 87.55.K‐
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spelling pubmed-56902092018-04-02 Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation Aslam, Ambreen Kakakhel, Muhammad Basim Shahid, Shaukat Ali Younas, Lubna Zareen, Sobia J Appl Clin Med Phys Technical Notes In this work, soft‐tissue equivalence of water, polystyrene, PMMA and water equivalence of polystyrene, and PMMA has been assessed for multiple megavoltage photon beams and field sizes. EGSnrc based Monte Carlo (MC) codes, BEAMnrc and DOSXYZnrc are used for the linac head modeling and the phantom dose calculations, respectively. Percentage depth doses (PDDs) are scored for two field sizes ([Formula: see text] , [Formula: see text]) and photon energies (6 MV and 10 MV) in water, polystyrene, PMMA, and soft tissue. The comparisons of PDDs show that soft‐tissue equivalence of various materials varies with the depth in the phantom, field size, and photon energy. Water and PMMA are found to be the closest soft‐tissue and water substitutes, respectively. Soft‐tissue and water equivalence of dosimetry materials need to be evaluated for a range of photon energies and field sizes before their application in complex radiation beams. PACS numbers: 87.55.Gh, 87.55.K‐ John Wiley and Sons Inc. 2016-01-08 /pmc/articles/PMC5690209/ /pubmed/26894338 http://dx.doi.org/10.1120/jacmp.v17i1.5700 Text en © 2016 The Authors. This is an open access article under the terms of the Creative Commons Attribution (http://creativecommons.org/licenses/by/3.0/) License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
spellingShingle Technical Notes
Aslam, Ambreen
Kakakhel, Muhammad Basim
Shahid, Shaukat Ali
Younas, Lubna
Zareen, Sobia
Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title_full Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title_fullStr Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title_full_unstemmed Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title_short Soft tissue and water substitutes for megavoltage photon beams: An EGSnrc‐based evaluation
title_sort soft tissue and water substitutes for megavoltage photon beams: an egsnrc‐based evaluation
topic Technical Notes
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5690209/
https://www.ncbi.nlm.nih.gov/pubmed/26894338
http://dx.doi.org/10.1120/jacmp.v17i1.5700
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