نتایج جستجو برای: based phantom

تعداد نتایج: 2946802  

2016
Shu-Jun Chang Shih-Yen Hung Yan-Lin Liu Shiang-Huei Jiang

In the internal dose evaluation, the specific absorbed fraction (SAF) and S-value are calculated from the reference phantom based on Caucasian data. The differences in height and weight between Caucasian and Asian may lead to inaccurate dose estimation. In this study, we developed the Taiwanese reference phantoms. 40 volunteers were recruited. Magnetic resonance images (MRI) were obtained, and ...

Journal: :iranian journal of cancer prevention 0
hamideh nazemi-gelyan dept. of medical physics, semnan university of medical sciences, semnan, iran hadi hasanzadeh dept. of medical physics, semnan university of medical sciences, semnan, iran yasha makhdumi reza radiotherapy oncology charity center, mashhad, iran sara abdollahi dept. of radiotherapy, iran university of medical sciences, tehran, iran fatemeh akbari reza radiotherapy oncology charity center, mashhad, iran fatemeh varshoee-tabrizi reza radiotherapy oncology charity center, mashhad, iran

background: radiotherapy plays an important role in the management of most malignant and many benign primary central nervous system (cns) tumors. radiotherapy affects both tumor cells and uninvolved normal cells; so, it is important to estimate absorbed dose to organs at risk in this kind of treatment. the aim of this study was to determine the absorbed dose to chiasma, lens, optic nerve, retin...

Journal: :British journal of anaesthesia 1997
S W Wartan W Hamann J R Wedley I McColl

Using a mail-delivered questionnaire, we surveyed 590 veteran amputees concerning phantom pain, phantom sensation and stump pain. They were selected randomly from a population of 2974 veterans with long-standing limb amputation(s) using a computer random number generator. Eighty-nine percent responded and of these, 55% reported phantom limb pain and 56% stump pain. There was a strong correlatio...

F. Rahmani, H Khalafi, S.M. Abtahi, S.M.R. Aghamiri,

Background: The aim of this work was to establish how well gel dosimeters performed, as substitutes for brain tissue compared with standard phantom materials such as water, polymethyl-methacrylate (or PMMA), A150 plastic and TE- liquid phantom material for dosimetry of neutron beams in boron neutron capture therapy. Materials and Methods: Thermal neutron fluence, photon dose and epithermal neu...

Journal: :Japanese Journal of Radiological Technology 1991

Journal: :journal of lasers in medical sciences 0
mohsen erfanzadeh laser and plasma research institute, shahid beheshti university.g.c., tehran, iran. saied alikhani laser and plasma research institute, shahid beheshti university.g.c., tehran, iran. mohammad ali ansari laser and plasma research institute, shahid beheshti university.g.c., tehran, iran. ezeddin mohajerani laser and plasma research institute, shahid beheshti university.g.c., tehran, iran.

introduction: in this study, arrangement of a low-cost optical tomography device compared to other methods such as frequency domain diffuse tomography or time domain diffuse tomography is reported. this low-cost diffuse optical imaging technique is based on the detection of light after propagation in tissue. these detected signals are applied to predict the location of in-homogeneities inside p...

Journal: :iranian journal of medical physics 0
mohammad taghi bahreyni toossi professor, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran eftekhar rajab bolokat m.sc., in medical physics, mashhad university of medical sciences, mashhad, iran raham salek m.sc., in medical engineering, medical physics research center, faculty of medicine, mashhad university of medical sciences, mashhad, iran shahram baiani associate professor, radiation oncology dept., omid hospital, mashhad university of medical sciences, mashhad, iran hamid gholamhoseinian ph.d., student, medical physics dept., faculty of medicine, mashhad university of medical sciences, mashhad, iran mohsen layegh m.sc., in medical physics, omid hospital, mashhad university of medical sciences, mashhad, iran.

introduction: nasopharyngeal carcinoma is one of the most common malignancies in the head and neck region and radiotherapy is its treatment of choice. in spite of the fact that it is widely used, due to the presence of many sensitive organs or tissues in this region, patients may suffer from a wide range of side effects. one such sensitive tissue is the spinal cord. if the absorbed dose to spin...

Journal: :Journal of Neurology, Neurosurgery & Psychiatry 1948

Journal: :Annals of the ICRP 2020

Journal: :Physical review 2021

Low thermal conductivity of polymers, which is one the considerable drawbacks commonly used composite structures, has been focus many researchers aiming to achieve high-performance polymer-based nanocomposites through inclusion highly thermally conductive fillers inside polymer matrices. Thus, in present study, a multiscale scheme using nonequilibrium molecular dynamics and finite element metho...

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