نتایج جستجو برای: mird
تعداد نتایج: 217 فیلتر نتایج به سال:
UNLABELLED This study reports on the biodistribution and radiation dosimetry of 2-(18)F-Fluoro-3-[2(S)-2-azetidinylmethoxy]pyridine ((18)F-fluoro-A-85380), a promising radioligand for the imaging of central nicotinic acetylcholine receptors (nAChRs). METHODS Whole-body scans were performed in 3 healthy male volunteers up to 2 h after intravenous injection of 137-238 MBq (18)F-fluoro-A-85380. ...
UNLABELLED Technical aspects and results of the dosimetric assessments of postoperative radioiodine ablation in the framework of an international, prospective, controlled, randomized, comparative study of the effectiveness of ablation therapy with 3.7 GBq (131)I in differentiated thyroid cancer after stimulation with recombinant human TSH (rhTSH) or by thyroid hormone withdrawal (THW) are prese...
Calculation of the therapeutic activity of radioiodine (131)I for individualized dosimetry in the treatment of Graves' disease requires an accurate estimate of the thyroid absorbed radiation dose based on a tracer activity administration of (131)I. Common approaches (Marinelli-Quimby formula, MIRD algorithm) use, respectively, the effective half-life of radioiodine in the thyroid and the time-i...
UNLABELLED Current methods for calculating the absorbed dose in a target region from a source region rely on a standard "reference man" geometry and assume an uniform distribution of radiolabel. While this approach is acceptable at the low levels of radioisotope administered for most diagnostic purposes, the generality of the calculations is not adequate for doses at the higher levels required ...
INTRODUCTION Lung counting has many sources of uncertainty that can impact on the activity estimate such as different deposition patterns of radioactivity in the lung, rib size and placement, chest wall composition and profile, effect of detector size and thickness. For example, if a lung counter is calibrated using a lung set that has the activity homogeneously distributed throughout the tissu...
UNLABELLED (18)F-labeled BMS747158 is a novel myocardial perfusion imaging tracer that targets mitochondrial complex 1. The objectives of this phase I study were to evaluate radiation dosimetry, biodistribution, human safety, tolerability, and early elimination of (18)F activity in urine after injection of a single dose of the tracer at rest in healthy subjects. METHODS Thirteen healthy subje...
UNLABELLED In this study, vitamin C was administered at various times as a sour stimulant to thyroid cancer patients, and the effect on salivary absorbed dose of therapeutic radioiodine ((131)I) was investigated. METHODS Patients with differentiated thyroid cancer who had been prepared for thyroid remnant ablation after total thyroidectomy were prospectively recruited and, using a random-numb...
Introdution: Today, the Advantages of radiation therapy by charged particles is indicated for the treatment of cancerous. During the passing of proton beam in the body tissues, secondary particles produce, which penetrate to the body healthy tissues and cause damage. The aim of this research was calculating the Spread out Bragg Peak for covering the breast cancer and investigating arrived dose ...
استفاده از بالون آنژیوپلاستی حاوی مایع رادیوآکتیو اخیراً به عنوان یک تکنیک جدید برای کاستن عود تنگی عروق، پیشنهاد شده است. اندازه‌گیری توزیع دْز در اطراف بالون آنژیوپلاستی پر شده با Re-perhenate186 با استفاده از فیلم رادیوکرومیک انجام گرفت. نرخ دْز اندازه‌گیری شده در فاصله 0.4 میلی‌متری از سطح بالون (با قطر 4 میلی‌متر و طول 40 میلی‌متر) برابر با مقدار [(cGy/min)/(mCi/ml)] 2.07 بود. ...
The purpose of the present work is to calculate specific absorbed fractions using variance reduction techniques and assess the effectiveness of these techniques in improving the efficiency (i.e. reducing the statistical uncertainties) of simulation results in cases where the distance between the source and the target organs is large and/or the target organ is small. The variance reduction techn...
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