نتایج جستجو برای: based phantom

تعداد نتایج: 2946802  

2009
Barbara Blasiak Grzegorz Zwierzchowski Janusz Skowronek Patrycja Stefaniak Magdalena Dymnicka

PURPOSE 1. Comparison and verification of accuracy of the implant reconstruction method based on images from IBU and CT. 2. Estimation of influence of the implant reconstruction method on dose disposition in selected reference points. MATERIAL AND METHODS Paraffin-wax phantom with three catheters, central marker and control point were prepared. IBU unit were used for obtaining two series of i...

Journal: :Journal of rehabilitation medicine 2007
Nicole E Acerra Tina Souvlis G Lorimer Moseley

Despite being different conditions, complex regional pain syndrome type 1, phantom limb pain and stroke share some potentially important similarities. This report examines experimental and clinical findings from each patient population. It identifies common aspects of symptomatic presentation, sensory phenomena and patterns of cortical reorganization. Based on these common findings, we argue th...

Journal: :Bio-medical materials and engineering 2014
Kim Mey Chew Norhudah Seman Rubita Sudirman Ching Yee Yong

The development of human-like brain phantom is important for data acquisition in microwave imaging. The characteristics of the phantom should be based on the real human body dielectric properties such as relative permittivity. The development of phantom includes the greymatter and whitematter regions, each with a relative permittivity of 38 and 28 respectively at 10 GHz frequency. Results were ...

Journal: :Journal of magnetic resonance 2017
M E Komlosh D Benjamini A S Barnett V Schram F Horkay A V Avram P J Basser

A silicon oil-filled glass capillary array is proposed as an anisotropic diffusion MRI phantom. Together with a computational/theoretical pipeline these provide a gold standard for calibrating and validating high-q diffusion MRI experiments. The phantom was used to test high angular resolution diffusion imaging (HARDI) and double pulsed-field gradient (d-PFG) MRI acquisition schemes. MRI-based ...

Journal: :Physical review 2021

It has been a long-standing problem in $N$-electron systems as to how solve the Dyson equation with quasiparticle wave functions defined $\ensuremath{\langle}\phantom{\rule{0.16em}{0ex}}{\mathrm{\ensuremath{\Psi}}}_{0}^{N}\phantom{\rule{0.16em}{0ex}}|\phantom{\rule{0.16em}{0ex}}{\ensuremath{\psi}}_{s}(\mathbit{r})\phantom{\rule{0.16em}{0ex}}|\phantom{\rule{0.16em}{0ex}}{\mathrm{\ensuremath{\Psi...

2008
Hui Yan Liwei Zhang Fang-Fang Yin

The purpose of this study is to evaluate the 3-dimensional target localization accuracy of cone-beam computed tomography (CBCT) using an on-board imager (OBI). An anthropomorphic pelvis phantom was used to simulate a range of offsets in the three translational directions and rotations around each of the three axes. After a translational or rotational offset was applied, a CBCT scan of the phant...

Journal: :Molecular imaging and biology : MIB : the official publication of the Academy of Molecular Imaging 2004
William P Segars Benjamin M W Tsui Eric C Frey G Allan Johnson Stuart S Berr

PURPOSE We develop a realistic and flexible 4-D digital mouse phantom and investigate its usefulness in molecular imaging research. METHODS Organ shapes were modeled with non-uniform rational B-spline (NURBS) surfaces based on high-resolution 3-D magnetic resonance microscopy (MRM) data. Cardiac and respiratory motions were modeled based on gated magnetic resonance imaging (MRI) data obtained...

2016
Zhiyue J. Wang Youngseob Seo Evelyn Babcock Hao Huang Stefan Bluml Jessica Wisnowski Barbara Holshouser Ashok Panigrahy Dennis W.W. Shaw Nolan Altman Roderick W. McColl Nancy K. Rollins

The purpose of this study was to explore the feasibility of assessing quality of diffusion tensor imaging (DTI) from multiple sites and vendors using American College of Radiology (ACR) phantom. Participating sites (Siemens (n = 2), GE (n= 2), and Philips (n = 4)) reached consensus on parameters for DTI and used the widely available ACR phantom. Tensor data were processed at one site. B0 and ed...

Journal: :Physiological measurement 2015
X Zhang C Chatwin D C Barber

A feasibility study of an electrical impedance mammography (EIM) system with a rotary planar electrode array, named RPEIM, is presented. The RPEIM system is an evolution of the Sussex MK4 system, which is a prototype instrument for breast cancer detection. Comparing it with the other planar electrode EIM systems, the rotation feature enables a dramatic increase in the number of independent meas...

2016
Andrew P Robinson Jill Tipping David M Cullen David Hamilton Richard Brown Alex Flynn Christopher Oldfield Emma Page Emlyn Price Andrew Smith Richard Snee

BACKGROUND Patient-specific absorbed dose calculations for molecular radiotherapy require accurate activity quantification. This is commonly derived from Single-Photon Emission Computed Tomography (SPECT) imaging using a calibration factor relating detected counts to known activity in a phantom insert. METHODS A series of phantom inserts, based on the mathematical models underlying many clini...

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