The TEAM 0.5 electron microscope is employed to demonstrate atomic resolution phase contrast imaging and focal series reconstruction with acceleration voltages between 20 and 300 kV and a variable dose rate. A monochromator with an energy spread of ≤0.1eV is used for dose variation by a factor of 1,000 and to provide a beam-limiting aperture. The sub-Ångstrøm performance of the instrument remai...

Background  It is remain a main concern that pediatric chest radiographies contribute to the significant radiation exposure to the thyroid gland as a more susceptible organ to radiation induced cancer. The aim of this study was to evaluate the entrance surface dose (ESD) of pediatric chest radiography compared to the diagnostic reference levels (DRL) and evaluation the efficacy of the lead (Pb)...

Background: One of the means of assessing dose to pa ents from Computed tomography (CT) procedure is through the determina on of the skin entrance dose (ESD) with the apprecia on of the concern that ocular exposure effects from CT scan includes possible induc on of cancer and cataract. Due to the rela vely more recent introduc on of CT scans, li le work has been done in this area in the country...

Introduction: Due to the use of ionizing radiation in the CT scan, optimal parameters should be used to reduce the risk of cancer in patients who are constantly exposed to X-rays. The aim of this study was to optimize the parameters used in CT scan of cervical vertebrae and neck soft tissue with minimal loss of image quality   Materials and Methods: In this s...

Background: Contact lenses are transparent, thin plastic disks that cover the surface of the cornea. Appropriate lens prescription should be performed properly by an expert to provide better visual acuity and reduce side effects. The lens administration is a multi-stage, complex and time-consuming process involving many considerations. The purpose of this study was to develop a decision support...

The incidence and severity of cataract were studied in 37 children who had completed treatment for acute lymphoblastic leukaemia. Twelve (32%) had posterior subcapsular lens opacities. Treatment had included corticosteroids and cranial irradiation, but no dose relationship was evident. The boys were more severely affected than the girls. Although none of the lens opacities was optically signifi...