نتایج جستجو برای: dose profiles.

تعداد نتایج: 457822  

Journal: :iranian journal of radiation research 0
y.l. kim department of radiology, choonhae college of health science, ulsan 689-784, south korea t.s. suh department of radiology, choonhae college of health science, ulsan 689-784, south korea b.y. choe department of radiology, choonhae college of health science, ulsan 689-784, south korea b.o. choi department of radiation oncology, seoul st. mary’s hospital, the catholic university, seoul 137-701, south korea j.b. chung department of radiadion oncology, seoul national university bundang hospital, seongnam 463-707, south korea j.w. lee department of radiation oncology, konkuk university medical center, seoul 143-729, south korea

background: dose calculation algorithms play a very important role in predicting the explicit dose distribution. we evaluated the percent depth dose (pdd), lateral depth dose profile, and surface dose volume histogram in inhomogeneous media using calculation algorithms and inhomogeneity correction methods. materials and methods: the homogeneous and inhomogeneous virtual slab phantoms used in th...

Journal: :iranian journal of radiation research 0
i. setilo medical physics department, faculty of health sciences, university of the free state, bloemfontein 9300, south africa f.c.p. du plessis medical physics department, faculty of health sciences, university of the free state, bloemfontein 9300, south africa

background:  radiochromic film is used for radiation dose measurement, xr-rv3 is used in fluoroscopy and ebt2 film in radiation therapy. the aim was to determine if the dosimetric properties of these two films are comparable in megavolt photon beams. materials and methods: comparison measurements included: calibration curves, heterogeneous phantom dose profiles, and nasopharynx dose distributio...

du Plessis, F.C.P., Setilo, I.,

Background:  Radiochromic film is used for radiation dose measurement, XR-RV3 is used in fluoroscopy and EBT2 film in radiation therapy. The aim was to determine if the dosimetric properties of these two films are comparable in megavolt photon beams. Materials and Methods: Comparison measurements included: calibration curves, heterogeneous phantom dose profiles, and nasopharynx dose distributio...

A. Bozkurt, G. Kemikler, H. Acun,

Background: This study aims to calculate the air-kerma strength (SK), the dose rate constant (∧) and the dose rate profiles of a Gammamed 12i Ir-192 source by using the Monte Carlo technique and to compare the dose rate values with those calculated by the Abacus HDR treatment planning system (TPS). Materials and Methods: Air-kerma strength (in units of U; 1 U= μGy m2 h-1) and the dose ra...

Complex pharmacokinetic (PK) properties including nonlinear elimination were encountered by some monoclonal antibodies (mAbs), and classic compartment models sometimes failed to appropriately describe those properties. In this work, a new model was built on a comprehensive analysis of the complex elimination of mAbs. This new model was firstly utilized to fit with the single-dose plasma concent...

Complex pharmacokinetic (PK) properties including nonlinear elimination were encountered by some monoclonal antibodies (mAbs), and classic compartment models sometimes failed to appropriately describe those properties. In this work, a new model was built on a comprehensive analysis of the complex elimination of mAbs. This new model was firstly utilized to fit with the single-dose plasma concent...

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...

2012
Jeffrey D. Cone C. Stephen Byrum Wyatt G. Payne David J. Smith

OBJECTIVES The goal of resident selection is twofold: (1) select candidates who will be successful residents and eventually successful practitioners and (2) avoid selecting candidates who will be unsuccessful residents and/or eventually unsuccessful practitioners. Traditional tools used to select residents have well-known limitations. The Hartman Value Profile (HVP) is a proven adjuvant tool to...

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