نتایج جستجو برای: photon dose distribution mcnp code percentage depth dose

تعداد نتایج: 1376868  

Abolfzal Nickfarjam Daniel Markel, Mahdieh Afkhami Ardakani Milad Najafzadeh, Mohammad Haghparast Mojtaba Hoseini-Ghahfarokhi,

Introduction: The aim of this study was to investigate the initial electron beam parameters for Monte Carlo model of 6MV photon beam produced by Siemens Oncor® linear accelerator.   Materials and Methods: In this study, the EGSnrc Monte Carlo user codes BEAMnrc and DOSXYZnrc were used. The beamnrc code were used for modelling of a 6 MV photon beam produced by...

Journal: :iranian journal of medical physics 0
ali asghar mowlavi associate professor, physics dept., faculty of sciences, sabzevar tarbiat moallem university, sabzevar, iran majed yazdani m.sc of physics, physics dept., faculty of sciences, sabzevar tarbiat moallem university, sabzevar, iran

introduction: clinical application of encapsulated radioactive brachytherapy sources has a major role in cancer treatment. in the present research, the effects of different tissue densities on the dose distribution of a 103pd brachytherapy source in a spherical phantom of 50 cm radius have been studied. material and methods: as is well known, absorbed dose in tissue depends to its density, but ...

Journal: :iranian journal of radiation research 0
a. mesbahi department of medical physics, medical school, tabriz university of medical sciences, tabriz, iran p. mehnati department of medical physics, medical school, tabriz university of medical sciences, tabriz, iran a. keshtkar department of medical physics, medical school, tabriz university of medical sciences, tabriz, iran

background: monte carlo method (mc) has played an important role in design and optimization of medical linacs head and beam modeling. the purpose of this study was to compare photon beam features of two commercial linacs, varian 21ex and elekta sl-25 using mcnp4c mc code. materials and methods: the 6mv photon beams of varian 21ex and elekta sl-25 linacs were simulated based on manufacturers pro...

Journal: :iranian journal of medical physics 0
ali asghar mowlavi assistant professor, physics dept., school of sciences, sabzevar tarbiat moallem university, sabzevar, iran

introduction:  90 sr/ 90 y source  has  been  used  for  the  intravascular  brachytherapy  to  prevent  coronary  restenosis in the patients who have undergone angioplasty. the aim of this research is to determine the  dose distribution of  90 sr/ 90 y source in a water phantom.  materials  and  methods:  in  the  present  work,  mcnp  code  has  been  applied  to  calculate  the  dose  distri...

2012
Wook Jae Yoo Jinsoo Moon Kyoung Won Jang Ki-Tek Han Sang Hun Shin Dayeong Jeon Jang-Yeon Park Byung Gi Park Bongsoo Lee

A T-shaped fiber-optic phantom-dosimeter system was developed using square scintillating optical fibers, a lens system, and a CMOS image camera. Images of scintillating light were used to simultaneously measure the transverse and longitudinal distributions of absorbed dose of a 6 MV photon beam with field sizes of 1 × 1 and 3 × 3 cm(2). Each optical fiber has a very small sensitive volume and t...

M Hazbavi M J Tahmasebi Birgani, M Tahmasbi N Chegeni, S M Hoseini

Background: In radiotherapy, low-energy photon beams are better adapted to the treated volume, and the use of high-energy beams can reduce hot spots in the radiation therapy. Therefore, mixing low and high energies with different ratios can control the rate of hotspots, as well as the dose distribution of the target volume.Material and Methods: The percentage depth doses (PDDs) were calculated ...

Journal: :Revista espanola de medicina nuclear 2004
M Rodríguez Gual F F Lima R Sospedra Alfonso J González González C Calderón Marín

Interface software was developed to generate the input file to run Monte Carlo MCNP-4B code from medical image in Interfile format version 3.3. The software was tested using a spherical phantom of tomography slides with known cumulated activity distribution in Interfile format generated with IMAGAMMA medical image processing system. The 3D dose calculation obtained with Monte Carlo MCNP-4B code...

M. Allahverdi, M. Hoseini-Ghahfarokhi, M. Shahriari, M. Zabihzadeh, M.R. Ay, S.R. Mahdavi,

Background: During intensity modulated radiation therapy (IMRT) technique, theoretically, presence of flattening filter (FF) across the beamline of clinical linear accelerator (linac) is not essential to obtain uniform lateral profiles due to intensity modulation of photon beams by multileaf collimators (MLCs). The aim of this study was to investigate the dosimetrical properties of 18 MV photon...

Mansour Zabihzadeh Mohammad Reza Ay, Mojtaba Hoseini- Ghahfarokhi Seyed Rabee Mahdavi

Introduction: During intensity modulated radiation therapy (IMRT) technique, theoretically, presence of flattening filter (FF) across the beamline of clinical linear accelerator (linac) is not essential to obtain uniform lateral profiles due to intensity modulation of photon beams by multileaf collimators (MLCs). The aim of this study was to investigate the dosimetrical propert...

Asghar Mesbahi, H. Dadgar,

Background: Accurate dose calculations in small beamlets and lung material have been a great challenge for most of treatment planning systems (TPS).  In the current study, the dose calculation accuracy of TiGRT TPS was evaluated for small beamlets in water and lung phantom by comparison to Monte Carlo (MC) calculations. Materials and Methods: The head of Siemens Oncor-impression linac...

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