نتایج جستجو برای: radiation dosages diagnostic x ray
تعداد نتایج: 1129911 فیلتر نتایج به سال:
Each Medical Imaging system has features that are more suitable to be used in certain medical situations than other systems. This motivates the continuous development of imaging systems with better features and fewer drawbacks. Some of the drawbacks are related to the radiation energy. For instance, X-ray is widely used in many imaging modalities such as CT, fluoroscopy and mammography. The abi...
this study was a part of national project to establish and optimize local and national diagnostic guidance levels. this work intends to evaluate image quality and entrance surface air kerma (esak) for patients' radiographic examinations in two north western provinces of country. two hospitals got involved in the present study. the rate of the rejected images and image quality grades were determ...
background: in diagnostic radiology there are two reasons for measuring or estimating radiation doses to patients. firstly measurements provide a means for setting and checking standards of good practice as an aid to the optimization of patient protection. secondly estimates of the absorbed dose to tissue and organs in the patients. materials and methods: a total of 2382 patients were studied t...
Background and purpose : Âpoptosis or programmed cell death is a process of cell suicide. Ïonizing radiation is one of the stimuli for apoptosis, acting through DNÂ damage. Ïn the present study, effects of X-rays induced apoptosis in HL60 cells, as well as the protective effects of Stem Çell Factor (SÇF) in inhibiting X-ray induced apoptosis have been evaluated. Materials and methods : HL6...
Background: The anatomic position and proven radiosensitivity of the thyroid make it an organ of concern in dental X-ray examinations. A National Radiation Protection Department (NRPD)-sponsored pilot study carried out in the Dental Radiology Department of RUMS., to assess if the radiation dose in panoramic radiographies could be reduced without significant impairment of the subjective image qu...
z Evidence summary Clinicians have been concerned about x-ray exposure during pregnancy since the 1950s. Much of this concern was based on the Oxford Survey of Childhood Leukemia, as well as other early casecontrol studies. These studies reported an approximate 40% increase in the risk of childhood leukemia among offspring of women who received diagnostic x-rays in pregnancy. However, by modern...
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