نتایج جستجو برای: mird method
تعداد نتایج: 1630212 فیلتر نتایج به سال:
زمینه: اسکن استخوان رایج‌ترین اسکن در مراکز پزشکی هسته‌ای است. اندازه‌گیری خطرات ناشی از پرتو و استفاده بهینه از تکنیک‌های تشخیصی مختلف با رادیودارو مستلزم اندازه‌گیری دقیق دز جذبی برای هر گروه از بیماران می‌باشد. هدف از انجام این تحقیق تعیین دز جذبی اندام‌ها در بیماران تحت اسکن استخوان با استفاده از روش MIRD بوده است. مواد و روش‌ها: در این مطالعه به هر یک از بیماران 25 میلی‌کوری رادیودارو 99mT...
a simple, rapid and low-cost scanner spectroscopy method for the glucose determination by utilizing glucose oxidase and cdte/tga quantum dots as chromoionophore has been described. the detection was based on the combination of the glucose enzymatic reaction and the quenching effect of h2o2 on the cdte quantum dots (qds) photoluminescence.in this study glucose was determined by utilizing glucose...
UNLABELLED Absorbed-dose calculations provide a scientific basis for evaluating the biologic effects associated with administered radiopharmaceuticals. In cancer therapy, radiation dosimetry supports treatment planning, dose-response analyses, predictions of therapy effectiveness, and completeness of patient medical records. In this study, we evaluated the organ radiation absorbed doses from in...
The potential of alpha-particle emitters to treat cancer has been recognized since the early 1900s. Advances in the targeted delivery of radionuclides and radionuclide conjugation chemistry, and the increased availability of alpha-emitters appropriate for clinical use, have recently led to patient trials of radiopharmaceuticals labeled with alpha-particle emitters. Although alpha-emitters have ...
background: recent pre-clinical and clinical studies indicate that irradiation in the dose range of 15 to 30 gy can reduce rate of restenosis in patients who have undergone an angioplasty. the use of filled balloon with radioactive solution was proposed as one of the possible intravascular irradiation techniques. materials and methods: the monte carlo n-particle transport code (mcnp4b) was used...
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...
In nuclear medicine and particularly in internal radiotherapy, one of the major challenges is to determine the dose for each patient. Current internal dosimetric estimations are based on the Medical Internal Radiation Dose (MIRD) formalism and use standard mathematical models. These standard models are often far from a given patient morphology and do not allow to perform patient-specific dosime...
Aim: Calculating the absorbed dose is important for the determination of risk and therapeutic benefit of internal radiation therapy. Optimal dose estimations require time-consuming and sophisticated methods, which are difficult due to practical reasons. To make dosimetry available for each of the patients, we developed a specific dosimetry procedure used in daily clinical routine. Materials and...
in new management approaches, in the organizations with inflexible structure, existing of red tapes and interruptions caused by limitations and also non-compliance with environmental changes, create demotivation among staff. with regard to the influence of job motivational potential and its relationship to the type of organizational structure( enabling and dissuasive), the goal of this research...
چکیده : تحقیق حاضر به منظور مقایسه دو روش تدریس انتزاعی و تدریس در متن بر یادگیری دستور زبان ایتالیاییِ زبان آموزان ترم 1 مدرسه ایتالیایی تهران در تابستان 89 صورت گرفت. روش تحقیق آزمایشی بوده و پژوهش بر 30 نفر از زبان آموزان مدرسه ایتالیایی تهران که بصورت تصادفی به 2 گروه جایگزین شدند صورت گرفت. ابزار تحقیق آزمون 30 سوالی تستی از بانک سوالات استاندارد شده بود که به تصادف انتخاب شده بودند.روشهای...
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