NDLI: Percentage depth dose evaluation in heterogeneous media using thermoluminescent dosimetry

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Percentage depth dose evaluation in heterogeneous media using thermoluminescent dosimetry

Content Provider	Semantic Scholar
Author	Cardoso, Stephanie Trindade Facure, Alessandro
Copyright Year	2010
Abstract	The purpose of this study is to investigate the influence of lung heterogeneity inside a soft tissue phantom on percentage depth dose (PDD). PDD curves were obtained experimentally using LiF:Mg,Ti (TLD-100) thermoluminescent detectors and applying Eclipse treatment planning system algorithms Batho, modified Batho (M-Batho or BMod), equivalent TAR (E-TAR or EQTAR), and anisotropic analytical algorithm (AAA) for a 15 MV photon beam and field sizes of 1 x 1, 2 x 2, 5 x 5, and 10 x 10 cm 2 . Monte Carlo simulations were performed using the DOSRZnrc user code of EGSnrc. The experimental results agree with Monte Carlo simulations for all irradiation field sizes. Comparisons with Monte Carlo calculations show that the AAA algorithm provides the best simulations of PDD curves for all field sizes investigated. However, even this algorithm cannot accurately predict PDD values in the lung for field sizes of 1 x 1 and 2 x 2 cm 2 . An overdosage in the lung of about 40% and 20% is calculated by the AAA algorithm close to the interface soft tissue/lung for 1 x 1 and 2 x 2 cm 2 field sizes, respectively. It was demonstrated that differences of 100% between Monte Carlo results and the algorithms Batho, modified Batho, and equivalent TAR responses may exist inside the lung region for the 1 x 1 cm 2 field.
Starting Page	117
Ending Page	127
Page Count	11
File Format	PDF HTM / HTML
PubMed reference number	20160687v1
Volume Number	11
Journal	Journal of applied clinical medical physics
Language	English
Access Restriction	Open
Subject Keyword	Chemistry Techniques, Analytical Detectors Drug Overdose Genetic Heterogeneity Leucaena pulverulenta Monte Carlo Method Phantoms, Imaging Photons Radiometry Structure of parenchyma of lung Tars Titanium algorithm leukemia inhibitory factor soft tissue
Content Type	Text
Resource Type	Article

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