نتایج جستجو برای: dose evaluation

تعداد نتایج: 1112594  

Introduction: Today electrophysiology studies and ablation have been developed due to increasing arrhythmias disorder of heart. In these diagnostic – treatments methods, the use of fluoroscopy can be causes patient radiation dose, therefore evaluation of patient's absorbed dose is necessary to protection of the radiation. The aim of this study was to evaluate the absorbed dose in patients under...

Journal: :iranian journal of radiation research 0
m.b. tavakoli department of medical physics and medical engineering, isfahan university of medical sciences, isfahan, iran n. kolghi department of medical physics and medical engineering, isfahan university of medical sciences, isfahan, iran z. shahi department of medical physics and medical engineering, isfahan university of medical sciences, isfahan, iran z. shaneh department of medical physics and medical engineering, isfahan university of medical sciences, isfahan, iran

background: breast is one of the main radiological sensitive organs, hence it is important to evaluate absorbed dose to this organ especially to the glandular parts. it is the aim of this study to measure mean glandular dose and image contrast in terms of different mammographic parameters. materials and methods: in this study two mammography machines located at said-al shohada (giotto) and shah...

2015
Jinhan Zhu Lixin Chen Along Chen Guangwen Luo Xiaowu Deng Xiaowei Liu

PURPOSE To use a graphic processing unit (GPU) calculation engine to implement a fast 3D pre-treatment dosimetric verification procedure based on an electronic portal imaging device (EPID). METHODS The GPU algorithm includes the deconvolution and convolution method for the fluence-map calculations, the collapsed-cone convolution/superposition (CCCS) algorithm for the 3D dose calculations and ...

2015
Hugo de las Heras Gala Felix Schöfer Britta Tiller Margarita Chevalier del Río Georg Zwettler Friedrich Semturs

Introduction and purpose: The latest developments in breast imaging technology have underlined the need for appropriate dosimetry and image evaluation methods for routine quality assurance. We are presenting QUART evaluation method (phantom and dosimeter) to address this need for digital x-ray mammography and breast tomosynthesis systems. We compare our dose measurements to the dose readings fr...

Background Patients' dosimetry is crucial in order to enhance radiation protection optimization and to deliver low radiation dose to the patients in a radiological procedure. The aim of this study was to assess the entrance surface dose (ESD) and radiation dose to the radiosensitive organs in pediatric pelvic radiography. Materials and Methods The studied population included 98 pediatric patien...

Introduction: Nowadays the use of cone beam computed tomography in dental imaging is increasing, although this method has a much lower dose than conventional CT scans, it delivers a higher dose than the panoramic and periapical patients therefore, , the aim of this study was to investigate the factors affecting the patients' dose in dental CBCTs and methods of optimizing and reducing the patien...

Journal: :Voprosy onkologii 2021

Purpose. The purpose of the current study was search for evaluation criterion radiosensitivity bone metastases various origins. Materials and methods. first part presents a modern classification pain, method its evaluation, mechanisms features metastatic pain. radiobiological patterns pain relief in low-dose anti-inflammatory radiation therapy were also considered. analysis these testifies favo...

Journal: :iranian journal of radiation research 0
s.a. haeri department of radiobiology, novin medical radiation institute, tehran, iran h. mozdarani m. foroghizadeh a. mahmoudzadeh

background: lymphocyte-dicentric assay is the most generally accepted method for biological dosimetry of overexposed individuals. in this study, the frequency of unstable chromosome aberration in blood lymphocytes was used to estimate radiation dose received by individuals. evaluation of dose using a calibration curve produced elsewhere may have a significant uncertainty therefore, experiments ...

Journal: :journal of applied pharmaceutical science 2022

Characterization and Evaluation of the Release Kinetics a Model Poorly Water-Soluble Low Dose Drug from Matrix Tablets Composed Blends Swellable Erodible Polymers: Implications for Controlled Complete ReleaseAiman A. Obaidat

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