نتایج جستجو برای: brachytherapy gamma sources

تعداد نتایج: 415361  

2013
Danielle R. Beaulieu David C. Medich Roger Steele

Brachytherapy describes a process where radioactive sources are inserted directly into the target area of a patient to treat disease. Before they can be used for treatment, brachytherapy sources must be calibrated such that medical physicists know their exact air kerma strength a quantity given by manufacturers as a standard. Each individual source must be measured before use. Therefore, medica...

Journal: :Circulation 2002
Christoph Hanefeld Schgofa Amirie Dieter Borchardt Peter Grewe K-M Müller Maria Kissler Andreas Mügge

BACKGROUND Intravascular brachytherapy is being applied more and more in patients with coronary artery disease for the prevention of restenosis subsequent to balloon angioplasty, in particular after stent implantation. Several radiation sources (beta- and gamma-emitters) are available in clinical routine. It was the purpose of this study to compare the radiation doses at the level of the advent...

پایان نامه :وزارت علوم، تحقیقات و فناوری - پژوهشگاه دانشهای بنیادی (مرکز تحقیقات فیزیک نظری و 1387

we show that when both sources ( lepton flavor violation sources and cp-violating phases) are present, the electric dipole moment of the electron, $d_e$, receives a contribution from the phase of the trilinear $a$-term of staus, $phi_{a_ au}$. for $phi_{a_ au}=pi/2$, the value of $d_e$, depending on the ratios of the lfv mass elements, can range between zero and three orders of magnitude a...

2011
Sunil Dutt Sharma Sudhir Kumar P. Srinivasan G. Chourasiya

A guarded cylindrical graphite ionization chamber of nominal volume 1000 cm3 was designed and fabricated for use as a reference standard for low-dose rate 137Cs brachytherapy sources. The air kerma calibration coefficient (N(K)) of this ionization chamber was estimated analytically using Burlin's general cavity theory, as well as by the Monte Carlo simulation and validated experimentally using ...

2001

INTRODUCTION Cervical carcinoma has traditionally been treated with low-dose-rate brachytherapy. High-dose-rate brachytherapy was developed to overcome potential disadvantages of LDR brachytherapy (radiation exposure to medical staff, prolonged treatment time, mandatory hospitalization and applicator movement). Both, LDR and HDR brachytherapy have been combined with the external beam therapy (E...

Background: The Monte Carlo (MC) method is not only used for dose calculations around brachytherapy sources but also for benchmarking treatment planning systems (TPS) calculations. Materials and Methods: Three 60Co sources of GZP6 brachytherapy unit were simulated using MCNP4C MC Code. The radial dose functions were calculated by MC method and GZP6 TPS and were compared. Results: There was a go...

M. Zehtabian, R. Faghihi, S. Sina,

Background: Iodine brachytherapy sources with low photon energies have been widely used in treating cancerous tumors. Dosimetric parameters of brachytherapy sources should be determined according to AAPM TG-43U1 recommendations before clinical use. Monte Carlo codes are reliable tools in calculation of these parameters for brachytherapy sources. Materials and Methods: Dosimetric param...

Journal: :Physics in medicine and biology 2013
Antony L Palmer Chris Lee Ailsa J Ratcliffe David Bradley Andrew Nisbet

A novel phantom is presented for 'full system' dosimetric audit comparing planned and delivered dose distributions in HDR gynaecological brachytherapy, using clinical treatment applicators. The brachytherapy applicator dosimetry test object consists of a near full-scatter water tank with applicator and film supports constructed of Solid Water, accommodating any typical cervix applicator. Film d...

Journal: :iranian journal of radiation research 0
m.b. tavakoli department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran d. shahbazi-gahrouei department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran m. hosseinpour department of medical physics and medical engineering, school of medicine, isfahan university of medical sciences, isfahan, iran

background: for an effective treatment planning in brachytherapy, it is necessary to know the accurate source dosimetric information such as air kerma strength, exposure rate constant, dose rate constant and redial dose distribution. the usual method to determine these factors is thermo luminescent dosimeter (tld) dosimetry. nowadays, another more accurate method is known to be the monte carlo ...

Journal: :iranian journal of radiation research 0
m. zehtabian radiation research center and radiation medicine department, school of engineering, shiraz university, shiraz, iran r. faghihi radiation research center and radiation medicine department, school of engineering, shiraz university, shiraz, iran s. sina radiation research center and radiation medicine department, school of engineering, shiraz university, shiraz, iran

background: iodine brachytherapy sources with low photon energies have been widely used in treating cancerous tumors. dosimetric parameters of brachytherapy sources should be determined according to aapm tg-43u1 recommendations before clinical use. monte carlo codes are reliable tools in calculation of these parameters for brachytherapy sources. materials and methods: dosimetric parameters (dos...

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