نتایج جستجو برای: x ray exposure
تعداد نتایج: 954050 فیلتر نتایج به سال:
Todays, X-ray imaging system for cargo and containers inspecting of country gates are highly regarded. The dual energy imaging system due to the use of two beams with different spectrums can extracts more information about the materials in cargo than the conventional X-ray imaging system. Since the X-ray beam is an ionizing radiation, three parameters should be taken into account including just...
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...
ABSTRACT Background: The radiographic image accuracy depends on the X-ray film information visibility. Good visibility is found by good contrast. Radiation exposure parameters (kVp, mAs) and film processing conditions have impact on contrast. In dentistry radiography machines, exposure time and processing procedure are set by radiographer. No optimized exposure time and process...
Discovery of x-ray and using of it for medical imaging have produced tremendous outcomes for diagnosis and treatment of diseases. More than 10 million diagnostic radiological procedures and 100,000 nuclear medicine exams are being performed daily around the world. According to the national commission on radiological protection and measurements (NCRP)-report 160, medical x-ray is contribute to a...
BACKGROUND As a well-known, physical carcinogen, ambient X-ray pollution assessment would be of great importance in today's modern world. Accordingly, the present study was done to measure the exposure level of ambient X-ray at inspection gates of two airports in Iran. According to which, the X-ray was measured at different points of the inspection gates including closed and opened Curtain, as ...
ABSTRACT Background: The X-ray machines used for radiodiagnosis should meet certain quality assurance (QA) programmes . These are necessary to have good quality radiographs at reasonably low exposure to patients. Materials and Methods: Dose reduction methods in abdomen X-ray examination were carried out in 10 hospitals in Tehran. This paper presents the work, which was implemented on 200 ...
BACKGROUND Medical surveillance of uranium miners can include periodic chest X-ray examinations. This study aimed to assess the X-ray exposure due to occupational health monitoring in the French cohort of uranium miners, and to test whether consideration of this additional radiation exposure impacts the excess risk of lung cancer death associated with radon exposure. METHOD X-ray exposure due...
Background: Radiation dose knowledge through Xray examinations and their distribution in Iran provides useful guidance on patient dose reduction. The results of the entrance skin dose (ESDs) of five common radiographies in all radiology centers in Yazd province were reported in our previous study (2003). In the present study we have evaluated the collective effective dose of convention...
Background & Objectives: The main purpose of this study was to assess the pulmonary reactions associated with occupational inhalation exposure to raw materials used in ceramic production (RMCP). Methods: Thirty three male workers with current exposure to RMCP and 20 healthy male unexposed employees, ,with almost identical demographic and socioeconomic status were interviewed and respiratory ...
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