نتایج جستجو برای: simplified dynamic phantom

تعداد نتایج: 468909  

ژورنال: سنجش و ایمنی پرتو 2020

Estimation of organ doses in diagnostic and therapeutic nuclear medicine procedures is an area of particular concern for radiation protection, in all over the world. The stylized computational phantoms have contributed significantly to radiation dosimetry in nuclear medicine; however, their simplified treatment of human anatomy is being criticized. Due to the fact that the ICRP adult reference ...

2014
Song Lee Joon-Il Choi Michael Yong Park Dong Myung Yeo Jae Young Byun Seung Eun Jung Sung Eun Rha Soon Nam Oh Young Joon Lee

PURPOSE To evaluate intra- and interobserver reliability of the gray scale/dynamic range of the phantom image evaluation of ultrasonography using a standardized phantom, and to assess the effect of interactive education on the reliability. METHODS Three radiologists (a resident, and two board-certified radiologists with 2 and 7 years of experience in evaluating ultrasound phantom images) perf...

Journal: :Oral surgery, oral medicine, oral pathology and oral radiology 2014
Gerald R Torgersen Caroline Hol Anne Møystad Kristina Hellén-Halme Mats Nilsson

OBJECTIVE The purpose of this work was to develop an inexpensive phantom for simplified image quality assurance (IQA) together with algorithms for objective evaluation of image quality parameters and to integrate these components into an easy-to-use software package. This should help make quality control of dental cone beam computed tomography (CBCT) units accessible, easy, and affordable for a...

2011
M. Donelli I. Craddock D. Gibbins M. Sarafianou Fabio Ferrari

This paper presents a novel stochastic microwave method for the detection, location and reconstruction of electric properties of breast cancer in a simplified breast phantom. The method is based on the inversion of time domain data. The problem is recast as an optimization one by defining a suitable cost function which is then minimized using an efficient evolutionary algorithm. Selected numeri...

Dynamic modulus characterizes the viscoelastic behavior of asphalt materials and is the most important input parameter for design and rehabilitation of flexible pavements using Mechanistic–Empirical Pavement Design Guide (MEPDG). Laboratory determination of dynamic modulus is very expensive and time consuming. To overcome this challenge, several predictive models were developed to determine dyn...

Journal: :Thermal Medicine(Japanese Journal of Hyperthermic Oncology) 1989

Journal: :iranian journal of medical physics 0
tayeb allahverdi pourfallah biochemistry and biophysics dept., faculty of medicine, mazandaran university of medical sciences, sari, iran

introduction polymer gel dosimeters offer a practical solution to 3d dose verification for conventional radiotherapy as well as intensity-modulated and stereotactic radiotherapy. in this study, egsnrc calculated and pagat polymer gel dosimeter measured dose profiles from single shot irradiation with 18 mm collimator of gamma knife in homogeneous and inhomogeneous phantoms were compared with eac...

Mahmoud Allahverdi Mohammad Hasan Zahmatkesh Tayeb Allahverdi Pourfallah,

Introduction Polymer gel dosimeters offer a practical solution to 3D dose verification for conventional radiotherapy as well as intensity-modulated and stereotactic radiotherapy. In this study, EGSnrc calculated and PAGAT polymer gel dosimeter measured dose profiles from single shot irradiation with 18 mm collimator of Gamma Knife in homogeneous and inhomogeneous phantoms were compared with eac...

2016
Daniel J. DeDora Sanja Nedic Pratha Katti Shafique Arnab Lawrence L. Wald Atsushi Takahashi Koene R. A. Van Dijk Helmut H. Strey Lilianne R. Mujica-Parodi

Task-free connectivity analyses have emerged as a powerful tool in functional neuroimaging. Because the cross-correlations that underlie connectivity measures are sensitive to distortion of time-series, here we used a novel dynamic phantom to provide a ground truth for dynamic fidelity between blood oxygen level dependent (BOLD)-like inputs and fMRI outputs. We found that the de facto quality-m...

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