نتایج جستجو برای: dose evaluation

تعداد نتایج: 1112594  

2012
Jino Bak Jin Hwa Choi Jae‐Sung Kim Suk Won Park

The quantitative comparison of two-dimensional dose distributions (e.g., calculated versus measured) has become a key issue in intensity-modulated radiotherapy (IMRT) QA. We proposed a new evaluation method referred to as modified dose difference (MDdiff) evaluation. Hereinafter, features and effectiveness of the MDdiff evaluation method will be described. In this work, the formalism of MDdiff ...

Journal: :iranian journal of medical physics 0
alireza mohammadkarim department of medical radiation engineering, science and research branch, islamic azad university, tehran, iran ph.d student, department of medical physics, faculty of medical sciences, tarbiat modares university, tehran, iran hasan ali nedaie department of radiotherapy, oncology and medical physics, tehran university of medical sciences, tehran, iran mahmoud allahverdi department of medical physics, tehran university of medical sciences, tehran, iran mahbod esfehani department of radiation oncology, cancer institute of iran, tehran university of medical sciences, tehran, iran alireza shirazi department of medical physics, tehran university of medical sciences, tehran, iran ghazale geraily department of medical physics, tehran university of medical sciences, tehran, iran

introduction evaluation of the delivered dose of externally wedged photon beams by external diode dosimeters during the treatment process requires the estimation of exit surface dose correction factors in various wedge angles and field sizes. materials and methods a system of absorbed dose evaluation, using p-type diode dosimeters placed on the exit surface of a phantom, was characterized for e...

Journal: :Journal of personality and social psychology 1983
A S Manstead C Proffitt J L Smart

The present study examines the applicability of Fishbein and Ajzen's theory of reasoned action to the prediction and understanding of how primiparous and multiparous mothers intended to feed their infants and how they actually fed these infants during the 6 weeks following delivery. Measures of attitudes to behavior, subjective norms, and behavioral intentions were taken during the last trimest...

پایان نامه :وزارت بهداشت، درمان و آموزش پزشکی - دانشگاه علوم پزشکی و خدمات بهداشتی درمانی استان فارس 1389

چکیده ندارد.

Journal: :iranian journal of medical physics 0
m. t. bahreyni toosi professor, medical physics research center, bu-ali research institute, mashhad university of medical sciences, mashhad, iran. h. saberi ph.d. student in medical physics, mashhad university of medical sciences, mashhad, iran m. momen nezhad ph.d. student in medical physics, mashhad university of medical sciences, mashhad, iran

introduction:  skin  sparing  is  one  of  the  most  desirable  characteristics  of  high  energy  photon  beams. however, the photons emerging from the target of linacs are contaminated by secondary  electrons  as  a  result  of  their  interactions  with  air,  collimators,  flattening  filter  and  any  other  objects in their path. this phenomenon tends to increase the skin dose received b...

Journal: :iranian journal of nuclear medicine 2013
hamid javadi ali mahmoud pashazadeh mehdi mogharrabi isa neshandar asli faraj tabei

introduction: the aim of present study was to estimate effective dose from most common procedures performed in nuclear medicine departments of golestan province. methods: data of nuclear medicine procedures performed in 2 nuclear medicine departments in golestan province were collected during 4 years. effective dose, collective effective dose and effective dose per examination were calculated u...

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