نتایج جستجو برای: entrance surface dose

تعداد نتایج: 941173  

Journal: :iranian journal of radiation research 0
s.m.j. mortazavi school of medicine, rafsanjan university of medical sciences, rafsanjan, iran m. ghiassi-nejad m. bakhshi m. jafari-zadeh a. kavousi j. ahmadi

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...

Journal: :iranian journal of radiation research 0
d. shahbazi-gahrouei department of medical physics and medical engineering, isfahan university of medical sciences, isfahan, iran

background: there is not any report on the radiation doses received by patients in diagnostic radiology sections in hospitals under control of chaharmahal and bakhtiari medical sciences university, in the south west of iran. objectives: the aim of this study is measurement of entrance surface doses (esd) for the most routine types of x-ray procedures in radiology centers as part of ongoing dose...

Journal: :iranian journal of radiation research 0
s.m.j. mortazavi school of medicine, rafsanjan university of medical sciences, rafsanjan, iran a. shareghi m. ghiassi-nejad a. kavousi m. jafari-zadeh f. nazeri

background: intraoral radiographies are the most frequent x-ray examinations in humans. according to international commission on radiation protection (icrp) recommendations, the selection of a diagnostic reference level (drl) should be specific to a country or region. critica l organs such as thyroid gland are exposed to x-rays in intraoral radiography and these exposures should be kept as low ...

Journal: :iranian journal of medical physics 0
malakeh malekzadeh paramedical school. babol university of medical sciences. babol. iran

introduction given the fact that children are more sensitive to radiation, compared to adults, special attention needs to be paid to radiation protection in pediatric radiology. diagnostic reference level (drl) has been defined to be employed as a practical tool for examining the overall performance of a radiological center in terms of patient dose among a series of similar equipments in an are...

Journal: :iranian journal of radiation research 0
n.n. jibiri radiation and health physics research laboratory, department of physics, university of ibadan, ibadan, nigeria a.a. adewale radiation and health physics research laboratory, department of physics, university of ibadan, ibadan, nigeria

background: one of the means of assessing dose to patients from computed tomography (ct) procedure is through the determination of the skin entrance dose (esd) with the appreciation of the concern that ocular exposure effects from ct scan includes possible induction of cancer and cataract. due to the relatively more recent introduction of ct scans, little work has been done in this area in the ...

Journal: :iranian journal of radiation research 0
n. n. jibiri radiation and health physics research laboratory, department of physics, university of ibadan, ibadan nigeria b. adeleye radiation and health physics research laboratory, department of physics, university of ibadan, ibadan nigeria b. kolude department of oral pathology, college of medicine, university of ibadan, ibadan, nigeria

background: intraoral radiographs are believed to deliver low doses to patients, thus little work has been done in this regards. considering the increment in the number of patients reporting for the examination and the probability of delayed somatic effects for accumulated low doses of x-irradiation, it is expedient to determine the doses to three critical organs eye, thyroid and parotid that a...

2015
A. Kawaguchi M. Kobayashi M. Suzuki T. Otsuka S. Hattori S. Suzuki

In general, dose evaluation for mammography uses average glandular dose (AGD). In mammography, entrance surface dose (ESD) is high, which is well known, but actual clinical data of ESD are not reported so much. This study investigated AGD and ESD for patients whose doses were estimated from 200 mammography examinations using European Organization for Quality-Assured Breast Screening and Diagnos...

Journal: :iranian journal of medical physics 0
nsikan u. esen - department of physics, akwa ibom state university, pmb 1167 uyo, nigeria

introduction radiation exposures from diagnostic medical examinations are generally low and are almost always justified by the benefits of accurate diagnosis of possible disease conditions. therefore, entrance skin dose (esd), body organ dose (bod), and effective dose (ed) from adult patients undergoing routine thorax posterior-anterior (pa) and thorax right lateral (rlat) were estimated in uni...

ژورنال: سنجش و ایمنی پرتو 2018

TL dosimetry is known as one of the effective dose estimation methods in diagnostic radiology. Cephalometry is used by dentists, oral and maxillofacial surgeons to choose the appropriate treatment. The purpose of this study is to measure the entrance skin dose, and dose to different organs of the patients in cephalometry using TLD-100. The entrance skin, and organ dose were obtained by putting ...

Journal: :journal of biomedical physics and engineering 0
s sina radiation research center, shiraz university, shiraz, iran b zeinali m karimipoorfard f lotfalizadeh m sadeghi e zamani

background: dose assessment using proper dosimeters is especially important in radiation protection optimization and imaging justification in diagnostic radiology. objective: the aim of this study is to obtain the entrance skin dose (esd) of patients undergoing lumbar spine imaging using two thermoluminescence dosimeters tld-100 (lif: mg, ti) and gr-200 (lif: mg, cu, p) and also to obtain the a...

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