نتایج جستجو برای: mird
تعداد نتایج: 217 فیلتر نتایج به سال:
introduction: in patients with thyroid carcinoma, radiation absorbed doses of the thyroid and surrounding tissues is important to weigh risk and benefit considerations. in nuclear medicine, the accuracy of absorbed dose of internally distributed radionuclides is estimated by different methods such as mird and direct method using tld. the aim of this study is using tld and a phantom to determine...
زمینه: وقتی اکتیویته مناسب از ید رادیواکتیو مثل ید131،132،133 جذب بدن شود می تواند سلول های سرطانی تیروئید را نابود کند.درحقیقت بخوبی می دانیم ایزوتوپ های ید علاوه بر تصویربرداری در درمان سرطان و پرکاری تیروئید کاربرد دارند.در یک درمان بهینه باید دوز خاصی به غده تیروئید برسد تا کمترین تابش به نخاع و مهره و بافت نرم و لایه چربی زیر پوست و پوست گردن برسد. هدف: اندازه گیری دوز جذبی در بافت زنده د...
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 ...
Introduction: In patients with thyroid carcinoma, radiation absorbed doses of the thyroid and surrounding tissues is important to weigh risk and benefit considerations. In nuclear medicine, the accuracy of absorbed dose of internally distributed radionuclides is estimated by different methods such as MIRD and direct method using TLD. The aim of this study is using T...
The paper presents the values of conversion coefficients from operational quantity , HP( 10)/ to protection effective dose (E). were calculated in a number points located at depth 10 mm under surface torso computational model MIRD-5 body an adult . simulated irradiation conditions corresponded both uniform and sharply non-uniform employee fields photon radiation with energy 0.04 2 MeV It was de...
The aim was the validation of a platform for internal dosimetry, named MCID, based on patient-specific images and direct Monte Carlo (MC) simulations, radioembolization liver tumors with 90Y-labeled microspheres. CT real patients were used to create voxelized phantoms different density activity maps. SPECT acquisitions simulated by SIMIND MC code. Input macros GATE/Geant4 code generated loading...
زمینه: اسکن کلیه یکی از روش‌های تشخیصی در مرکز پزشکی هسته‌ای برای تشخیص بیماری‌های کلیوی است، با تمام مزایای تصاویر پزشکی هسته‌ای بدون شک کار با مواد پرتوزا مشکلات متعددی را به همراه خواهد داشت، به همین علت اندازه‌گیری دز جذبی هر روش برای ارزیابی خطر و سود آن مفید است. هدف ما از انجام این مطالعه محاسبه دز جذبی ارگان کلیه‌ها، کبد، طحال و مثانه در سنتی‌گرافی کلیه بود. مواد و روش‌ها: در این مطالعه...
Neurosurg 16: 378-418, 1969 20. EklSf B, Lassen NA, Nilsson L et al: Regional cerebral blood flow in the rat measured by the tissue sampling technique; a critical evaluation using four indicators C"-antipyrine, C"ethanol, H'-water and xenon". Acta Physiol Scand 91: 1-10, 1974 21. Eckman WW, Phair RD, Fenstermacher JD et al: Permeability limitation in estimation of local brain blood flow with (C...
A Monte Carlo shielding model for PET/CT clinics Robert L. Metzger and Kenneth A. Van Riper Radiation Safety Engineering, Inc Chandler, AZ Abstract Modern PET/CT clinics consist of a scanner room housing the double gantry PET/CT unit and a control area, two or more quiet rooms where patients rest prior to scanning, and a hot lab where doses are prepared. Of these areas, the scanner room, quiet ...
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