نتایج جستجو برای: dose estimation
تعداد نتایج: 569394 فیلتر نتایج به سال:
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...
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...
The standard categorical system for assessing attribution of toxicity to study drug(s) in phase I trials is cumbersome and uninformative. Although a binary system ("related" vs. "unrelated") would be sufficient to define maximum tolerated dose (MTD), a probability estimation would better support dose selection for randomized dose-ranging phase II trials.
— By using the slope method, we obtain an explicit uniform estimation for the density of rational points in an arithmetic projective variety with given degree and dimension, embedded in a given arithmetic projective space. Résumé. — On obtient, en utilisant la méthode de pentes, une estimation uniforme et explicite de la densité des points rationnels dans une variété arithmétique projective de ...
INTRODUCTION The problem of correct estimation of low-level exposure chronic irradiation biological consequences is one of the most important unsolved problem. It is actual for radiobiology and radioecology at the moment. The development of new concept of radiation protection of human and biota should be based on clear understanding of low-level chronic exposure biological consequences. The est...
background: in vivo dosimetry is a method for estimation of overall error in the delivered dose to the patients at the end of radiotherapy process. in this research, two methods for target dose calculation were evaluated on midline and central axis of photon beams in in vivo dosimetry of thorax fields. materials and methods: entrance and exit doses for anterior and lateral fields of thorax were...
Background and purpose: Estimation of the risks of radiation would be possible by identifying the dose received. Introducing the dose level from diagnostic procedures can be effective in reducing the patient dose, improving the quality of treatment, and increasing the safety of patients and staff. This study evaluated patient entrance surface dose (ESD), effective dose, and cumulative dose from...
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