investigation of the effects of tissue inhomogeneities on the dosimetric parameters of a cs-137 brachytherapy source using the mcnp4c code

Authors

mehdi zehtabian phd student of nuclear engineering, faculty of mechanical engineering, shiraz university, shiraz, iran.

reza faghihi assistant professor of nuclear engineering dept., , radiation research center, faculty of mechanical engineering, shiraz university, shiraz, iran

sedighe sina phd student of nuclear engineering, faculty of mechanical engineering, shiraz university, shiraz, iran.

azimeh noorizadeh msc student of nuclear engineering, faculty of mechanical engineering, shiraz university, shiraz, iran.

abstract

introduction: brachytherapy is the use of small encapsulated radioactive sources in close vicinity of tumors. various methods are used to obtain the dose distribution around brachytherapy sources. tg-43 is a dosimetry protocol proposed by the aapm for determining dose distributions around brachytherapy sources. the goal of this study is to update this protocol for presence of bone and air inhomogenities. material and methods: to update the dose rate constant parameter of the tg-43 formalism, the mcnp4c simulations were performed in phantoms composed of water-bone and water-air combinations. the values of dose at different distances from the source in both homogeneous and inhomogeneous phantoms were estimated in spherical tally cells of 0.5 mm radius using the f6 tally. results: the percentages of dose reductions in presence of air and bone inhomogenities for the cs-137 source were found to be 4% and 10%, respectively. therefore, the updated dose rate constant (λ) will also decrease by the same percentages. discussion and conclusion: it can be easily concluded that such dose variations are more noticeable when using lower energy sources such as pd-103 or i-125.

Upgrade to premium to download articles

Already have an account?login

similar resources

Investigation of the Effects of Tissue Inhomogeneities on the Dosimetric Parameters of a Cs-137 Brachytherapy Source using the MCNP4C Code

Introduction: Brachytherapy is the use of small encapsulated radioactive sources in close vicinity of tumors. Various methods are used to obtain the dose distribution around brachytherapy sources. TG-43 is a dosimetry protocol proposed by the AAPM for determining dose distributions around brachytherapy sources. The goal of this study is to update this protocol for presence of bone and air inhom...

full text

investigation of effective parameters on the rigidity of light composite diaphragms (psscb) by fem

در این رساله با معرفی سقف های psscb متشکل از ترکیب ورق های فولادی ذوزنقه ای و تخته های سیمانی الیافی به عنوان سقف های پیش ساخته (سازگار با سیستم سازه ای قاب های فولادی سبک) به بررسی پارامترهای موثر بر صلبیت سقف، پرداخته می شود. در تحقیق حاضر ابتدا به مدل سازی دو نمونه سقف آزمایش شده، به روش اجزاء محدود با استفاده از نرم افزار تحلیلی abaqus ver 6.10 پرداخته شده است. نمونه های ساخته شده تحت اعما...

Investigation of Anisotropy Caused by Cylinder Applicator on Dose Distribution around Cs-137 Brachytherapy Source using MCNP4C Code

Introduction: Brachytherapy is a type of radiotherapy in which radioactive sources are used in proximity of tumors normally for treatment of malignancies in the head, prostate and cervix. Materials and Methods: The Cs-137 Selectron source is a low-dose-rate (LDR) brachytherapy source used in a remote afterloading system for treatment of different cancers. This system uses active and inactive sp...

full text

A Comparison of the Dosimetric Parameters of Cs-137 Brachytherapy Source in Different Tissues with Water Using Monte Carlo Simulation

Introduction After the publication of Task Group number 43 dose calculation formalism by the American Association of Physicists in Medicine (AAPM), this method has been known as the most common dose calculation method in brachytherapy treatment planning. In this formalism, the water phantom is introduced as the reference dosimetry phantom, while the attenuation coefficient of the sources in the...

full text

the effect of using model essays on the develpment of writing proficiency of iranina pre-intermediate efl learners

abstract the present study was conducted to investigate the effect of using model essays on the development of writing proficiency of iranian pre-intermediate efl learners. to fulfill the purpose of the study, 55 pre- intermediate learners of parsa language institute were chosen by means of administering proficiency test. based on the results of the pretest, two matched groups, one as the expe...

the effect of consciousness raising (c-r) on the reduction of translational errors: a case study

در دوره های آموزش ترجمه استادان بیشتر سعی دارند دانشجویان را با انواع متون آشنا سازند، درحالی که کمتر به خطاهای مکرر آنان در متن ترجمه شده می پردازند. اهمیت تحقیق حاضر مبنی بر ارتکاب مکرر خطاهای ترجمانی حتی بعد از گذراندن دوره های تخصصی ترجمه از سوی دانشجویان است. هدف از آن تاکید بر خطاهای رایج میان دانشجویان مترجمی و کاهش این خطاها با افزایش آگاهی و هوشیاری دانشجویان از بروز آنها است.از آنجا ک...

15 صفحه اول

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}

Journal title:

iranian journal of medical physics

جلد ۷، شماره ۳، صفحات ۱۵-۲۰

Keywords

[ ' b r a c h y t h e r a p y ' , ' d o s e r a t e c o n s t a n t ' , ' d o s i m e t r y ' , ' t g ' , 4 3 ]

Hosted on Doprax cloud platform doprax.com