نتایج جستجو برای: based phantom

تعداد نتایج: 2946802  

Journal: :journal of biomedical physics and engineering 0
k hadad shiraz university m zohrevand shiraz university r faghihi shiraz university a sedighi pashaki mahdieh m.r.i center, hamedan

background: hdr brachytherapy is one of the commonest methods of nasopharyngeal cancer treatment. in this method, depending on how advanced one tumor is, 2 to 6 gy dose as intracavitary brachytherapy is prescribed. due to high dose rate and tumor location, accuracy evaluation of treatment planning system (tps) is particularly important. common methods used in tps dosimetry are based on computat...

Journal: :علوم پیراپزشکی و بهداشت نظامی 0
سید سلمان ذکریایی seyed salman zakariaee department of radiology, faculty of paramedicine, aja university of medical sciences, tehran, iranگروه رادیولوژی، دانشکده ی پیراپزشکی، دانشگاه علوم پزشکی ارتش، تهران، ایران. ولی اله صبا valiallah saba department of radiology, faculty of paramedicine, aja university of medical sciences, tehran, iranگروه رادیولوژی، دانشکده ی پیراپزشکی، دانشگاه علوم پزشکی ارتش، تهران، ایران.

introduction: in diagnostic and therapeutic procedures, dosimetric studies are performed on the dosimetric systems in order to comply the radiation safety standards. monte carlo methods are used due to the high complexity and cost of patient-specific phantom construction. the high complexity of the digitized phantoms greatly increases the time and computational task of the monte carlo calculati...

2015
Susanne Ziegler Bjoern W. Jakoby Harald Braun Daniel H. Paulus Harald H. Quick

BACKGROUND In integrated PET/MR hybrid imaging the evaluation of PET performance characteristics according to the NEMA standard NU 2-2007 is challenging because of incomplete MR-based attenuation correction (AC) for phantom imaging. In this study, a strategy for CT-based AC of the NEMA image quality (IQ) phantom is assessed. The method is systematically evaluated in NEMA IQ phantom measurements...

Journal: :iranian journal of radiation research 0
j.w. hong department of radiation oncology, seoul national university bundang hospital, republic of korea h.k. lee department of computer science and engineering, soonchunhyang university, republic of korea j.h. cho department of international radiological science, hallym university of graduate studies, republic of korea

background: this study assessed the clinical usefulness of the solid phantom, which may compensate for the disadvantages of the water phantom, by comparing the radiological doses between the two depending on their depths. materials and methods: the experimental equipment used was a linear accelerator for medical use, water phantom, solid phantom, farmer type ion chamber and electrometer. the di...

Journal: :iranian journal of medical physics 0
jalil pirayesh islamian department of medical physics, tabriz university of medical sciences, tabriz, iran. mohammad taghi bahreyni toossi department of medical physics, mashhad university of medical sciences, mashhad, iran.

introduction quality control is an important phenomenon in nuclear medicine imaging. a jaszczak spect phantom provides consistent performance information for any spect or pet system. this article describes the simulation of a jaszczak phantom and creating an executable phantom file for comparing assessment of spect cameras using simind monte carlo simulation program which is well-established fo...

Introduction: Existing phantoms have been constructed based on Caucasian, non-Caucasian and race-specific datasets. According to previous studies made efforts to present Korean- specific phantoms and Chinese female phantom based on CVH dataset due to compare the resulting internal dosimetry with the Caucasian based data showed possible racial difference in human anatomy between ...

Journal: :iranian journal of radiation research 0
s. senthilkumar department of radiotherapy, madurai medical college and govt. rajaji hospital, maduari-625 020, india

background: the purpose of this study is to fabricate inexpensive in-house low cost homogeneous and heterogeneous human equivalent thorax phantom and assess the dose accuracy of the treatment planning systems (tps) calculated values for different lung treatment dosimetery. it is compared with thermoluminescent dosimeter (tld) measurement. materials and methods: homogeneous and heterogeneous tho...

ذکریایی, سید سلمان, صبا, ولی اله,

Introduction: In diagnostic and therapeutic procedures, dosimetric studies are performed on the dosimetric systems in order to comply the radiation safety standards. Monte Carlo methods are used due to the high complexity and cost of patient-specific phantom construction. The high complexity of the digitized phantoms greatly increases the time and computational task of the Monte Carlo calculati...

Journal: :International Journal of Modern Physics D 2010

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