نتایج جستجو برای: skin dose
تعداد نتایج: 493200 فیلتر نتایج به سال:
introduction: effects of melatonin (mt) were comparatively examined on melanophores of isolated skin in adults and tadpole’s tailfin of a frog rana cyanophlyctis. mt is generally considered as a potent melanophores aggregating hormone besides regulating the sleep wake cycle in vertebrates. methods: melanophore size index (msi) was chosen as a recording parameter of the responses. concentration-...
The purpose of this study was to evaluate peak skin dose received by the patient and scattered dose to the operator during dual-axis rotational coronary angiography (DARCA), and to compare with those of standard coronary angiography (SA). An anthropomorphic phantom was used to simulate a patient undergoing diagnostic coronary angiography. Cine imaging was applied on the phantom for 2 s, 3 s, an...
The purpose of this study was to evaluate the skin-sparing effects of 3-dimensional conformal radiotherapy (3D-CRT) and intensity-modulated radiotherapy (IMRT) in patients with early left-sided breast cancer. Twenty left breast cancer patients treated with whole breast radiotherapy following breast-conserving surgery were enrolled in this study, and the 3D-CRT and IMRT plans were generated for ...
Calculating the peak skin dose resulting from fluoroscopically guided interventions. Part I: Methods
While direct measurement of the peak skin dose resulting from a fluoroscopically-guided procedure is possible, the decision must be made a priori at additional cost and time. It is most often the case that the need for accurate knowledge of the peak skin dose is realized only after a procedure has been completed, or after a suspected reaction has been discovered. Part I of this review article d...
PURPOSE Preliminary dosimetric findings in patients managed with the Contura® Multi-Lumen Balloon (MLB) breast brachytherapy catheter to deliver accelerated partial breast irradiation (APBI) on a multi-institutional phase IV registry trial were reviewed. MATERIAL AND METHODS CT-based 3D planning with dose optimization was performed for all patients. For the study, new ideal dosimetric goals w...
Background and purpose: Due to creation of scattered radiation when using non-carbon fiber base plates particularly in treating breast cancer, applying this device can affect skin and body surface dose. Recently, using Gaf-Chromic films have led to obtaining good results in skin dosimetry. The purpose of this study was the estimation of skin dose in applying non-carbon fiber base plates using w...
Background and Aim: The objective of this study was to measure and compare the tissue absorbed dose in thyroid gland, salivary glands, eye and skin in maxillofacial imaging with panoramic, conventional linear tomography, cone beam computed tomography (CBCT) and computed tomography (CT).Materials and Methods: Thermoluminescent dosimeters (TLD) were implanted in 14 sites of RANDO phantom to measu...
Introduction: Nowadays, we are witnessing a progressive application of radiology techniques in various communities as well as in Iran. Medical radiological examinations are one of the important sources of public radiological dose. Entrance skin doses and effective doses for patients in diagnostic radiology examinations should be assessed for the imaging techniques optimization and patient&rsquo...
News media and meteorological bulletins generally report on the ultraviolet index (UVI) to prevent overexposure sun. However, this information does not reflect accumulated damage skin induced by total amount of UVR (ultraviolet radiation) over time, known as erythemal dose (ED). This study analyzed UVI ED measured at ±30 ±60 minutes around solar noon (SN) in Arica, North Chile. The results show...
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