نتایج جستجو برای: lens dose reduction
تعداد نتایج: 822616 فیلتر نتایج به سال:
In view of the rapid expansion of contact lens amongst the users, new dimensions have been added to the domain of ophthalmology: Giant papillay conjunctivitis, a disease caused by different kinds of contact lens, appears weeks or months after they are used, although some patients are struck years later. The predominant symptoms are increased awareness of lenses, ocular itching, blurred vision a...
Classical theories suggest that the surface area of the crystalline lens changes during accommodation while the lens volume remains constant. Our recent work challenged this view by showing that the lens volume decreases as the lens flattens during unaccommodation. In this paper we investigate 1) the magnitude of changes in the surface of the in vitro isolated cow lens during simulated accommod...
Reduction of the quality of the image formed by an optical system is a function of different parameters such as lens aberrations, CCD digitization errors, and the errors of system assembling. Assembling errors usually consist of two types: 1) the prism error, which is the error of non-orthogonality of the optical axis and the image plane 2) the de-centering error, which is error of not passing ...
Workers involved in interventional cardiology procedures receive high eye lens dose if protection is not used. Currently, there is no suitable method for routine use for the measurement of eye dose. Since most angiography machines are equipped with suitable patient dosemeters, deriving factors linking staff eye doses to the patient doses can be helpful. In this study the patient kerma-area prod...
Studies of the effects of galactose on the lens have revealed that marked depressions in the levels of free amino acids and free myo-inositol occur. These changes can be demonstrated by incubating a rabbit lens in a medium containing 30 mM. galactose. However, the lens incubated in galactose but also exposed to tetramethylene glutaric, an aldose reductase inhibitor, shows little dulcitol accumu...
When we chose Radiation Dose and Dose Reduction as the topic for the fifth volume in the Radiology Select series, we were very excited about offering a compilation of articles on a theme of utmost importance to all radiologists and health care providers. The concept of the right radiation dose for the right study, at the right time, is central to optimizing care for those patients who require i...
This article presents a comparative clinical study of digital imaging, as a new technology, and conventional method for X - Ray absorption in lens and thyroid.Clinical examination was performed on 50 patients with an average of 28 years among the cases who were reffered to the department of rediology, Islamic Azad universiy of IRAN in 1999.Two pocket dosimeters were used to meausre the dose rat...
As a consequence of the success of medical imaging over the past decades for aid in accurately diagnosing disease or injury and guiding therapy, the collective radiation dose delivered to the U.S. population from medical imaging has increased six-fold since the 1980s (1,2). This has resulted in substantial concern from physicians, patients, and regulators. Consequently, radiation dose managemen...
The radiation dose received by cardiologists during percutaneous coronary interventions, electrophysiology procedures and other interventional cardiology procedures can vary by more than an order of magnitude for the same type of procedure and for similar patient doses. There is particular concern regarding occupational dose to the lens of the eye. This document provides recommendations for occ...
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