نتایج جستجو برای: solid phantom.

تعداد نتایج: 206123  

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...

H.K. Lee, J.H. Cho, J.W. Hong,

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 radiation research 0
n. demir physics department, faculty of arts and sciences, uludag university, gorukle campus,16059, bursa, turkey u. akar tarim physics department, faculty of arts and sciences, uludag university, gorukle campus,16059, bursa, turkey o. gurler physics department, faculty of arts and sciences, uludag university, gorukle campus,16059, bursa, turkey

background: in radiation therapy, water is the phantom material of choice, both for reference and for relative dosimetry measurements. solid phantoms, however, are more useful for routine measurements because they tend to be more robust and easier to set up than water phantoms. materials and methods: fluka input data cards have been arranged in sequential order. a simple cylindrical geometry wi...

Journal: :iranian journal of medical physics 0
fatemeh lotfalizadeh department of ray-medical engineering, shiraz university, shiraz, iran mehrnoosh karimipourfard department of ray-medical engineering, shiraz university, shiraz, iran bentolhoda amanat department of physics, payame noor university, tehran, iran mehdi zehtabian department of ray-medical engineering, shiraz university, shiraz, iran

introduction based on task group no. 43 (tg-43u1) recommendations, water phantom is proposed as a reference phantom for the dosimetry of brachytherapy sources. the experimental determination of tg-43 parameters is usually performed in water-equivalent solid phantoms. the purpose of this study was to determine the conversion factors for equalizing solid phantoms to water. materials and methods t...

Journal: :Medical physics 2005
Jan Seuntjens Marina Olivares Michael Evans Ervin Podgorsak

For reasons of phantom material reproducibility, the absorbed dose protocols of the American Association of Physicists in Medicine (AAPM) (TG-51) and the International Atomic Energy Agency (IAEA) (TRS-398) have made the use of liquid water as a phantom material for reference dosimetry mandatory. In this work we provide a formal framework for the measurement of absorbed dose to water using ioniz...

Ali. S. Meigooni Bentolhoda Amanat, Fatemeh Lotfalizadeh, Mehdi Zehtabian, Mehrnoosh Karimipourfard, Neda Zaker Sedigheh Sina

Introduction Based on Task Group No. 43 (TG-43U1) recommendations, water phantom is proposed as a reference phantom for the dosimetry of brachytherapy sources. The experimental determination of TG-43 parameters is usually performed in water-equivalent solid phantoms. The purpose of this study was to determine the conversion factors for equalizing solid phantoms to water. Materials and Methods T...

2008
Martin J. Butson Tsang Cheung Peter K. N. Yu

Solid water is often the phantom material of choice for dosimetry procedures in radiotherapy high-energy X-ray and electron beam radiation calibration and quality assurance. This note investigates variation in heat conduction that can occur for a common commercially available solid water stack phantom when a temperature differential occurs between the phantom and ambient temperature. These vari...

Journal: :International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2021

Introduction: Radiotherapy is one of the important treatment modalities in cancer treatment. To maintain procedure accuracy, phantom an essential tool for absolute dosimetry conformation and Quality Assurance routine cheek up. This work aims to study absorbed dose various phantoms hence make a comparison result with IAEA recommendation (TRS 398) daily QA Linac. Materials Methods: The experiment...

Journal: :Physical review 2021

The accurate description of phonons in a solid is one the central research topics field condensed matter physics and materials science. Here, authors report successful application $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ quantum Monte Carlo (QMC) framework to phonon dispersion calculat...

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