Asymmetric three-dimensional finite element analysis of a magnetically shielded room with access ports

Abstract

Event Abstract Back to Event Asymmetric three-dimensional finite element analysis of a magnetically shielded room with access ports Broc Burke1* and Solomon Diamond1 1 Dartmouth College, United States As part of a new initiative in multimodal functional neuroimaging at Dartmouth, a novel design for an economical magnetically shielded room (MSR) has been custom fabricated and installed on site. A three-dimensional finite element analysis (FEA) model was developed in concert with the MSR for evaluation of critical aspects of the design and then determination of degaussing effectiveness. The FEA model generates a full three-dimensional map of the shielding factor as a function of frequency and is sensitive to the number, thickness, and spacing of wall shielding, as well as access ports such as the door, vents and feed through panel. This simulation uses quadratic vector Lagrange elements to solve for the total electric and magnetic potentials using a time-harmonic analysis. With this model, estimation of the spatial variation in the shielding factor for a modestly shielded room is demonstrated. The Dartmouth MSR has internal dimensions of 2.35m x 2.35m x 2.16m and has two high conductivity eddy current layers and one mu metal layer (two additional layers, one eddy current and one mu metal layer will be added in the near future). The simulation results indicate that the shielding factor at the center of the MSR does not vary significantly with incident angle of the applied magnetic field. However, spatial inhomogeneities in the shielding factor are evident near MSR access ports. The results of this simulation will be used in fu-ture work, where the degaussing of the room will be validated against modeling predictions. Our future modeling work will add a virtual patient and virtual instruments, electroencepha-lograph (EEG), and near-infrared spectroscopy (NIRS), for evaluation of achievable multimodal contrast to noise. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: Instrumentation and Multi-modal Integrations: MEG, Low-field MRI,EEG, fMRI,TMS,NIRS Citation: Burke B and Diamond S (2010). Asymmetric three-dimensional finite element analysis of a magnetically shielded room with access ports. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00430 Copyright: The abstracts in this collection have not been subject to any Frontiers peer review or checks, and are not endorsed by Frontiers. They are made available through the Frontiers publishing platform as a service to conference organizers and presenters. The copyright in the individual abstracts is owned by the author of each abstract or his/her employer unless otherwise stated. Each abstract, as well as the collection of abstracts, are published under a Creative Commons CC-BY 4.0 (attribution) licence (https://creativecommons.org/licenses/by/4.0/) and may thus be reproduced, translated, adapted and be the subject of derivative works provided the authors and Frontiers are attributed. For Frontiers’ terms and conditions please see https://www.frontiersin.org/legal/terms-and-conditions. Received: 09 Apr 2010; Published Online: 09 Apr 2010. * Correspondence: Broc Burke, Dartmouth College, Hannover, United States, broc@stanfordalumni.org Login Required This action requires you to be registered with Frontiers and logged in. To register or login click here. Abstract Info Abstract The Authors in Frontiers Broc Burke Solomon Diamond Google Broc Burke Solomon Diamond Google Scholar Broc Burke Solomon Diamond PubMed Broc Burke Solomon Diamond Related Article in Frontiers Google Scholar PubMed Abstract Close Back to top Javascript is disabled. Please enable Javascript in your browser settings in order to see all the content on this page.