A High-sensitivity Magnetocardiography System with 64 Axial Gradiometers Inside a Low Boil-off Dewar

Abstract

Event Abstract Back to Event A High-sensitivity Magnetocardiography System with 64 Axial Gradiometers Inside a Low Boil-off Dewar Yong-Ho Lee1*, Kwon-Kyu Yu1, Hyukchan Kwon1, Jin-Mok Kim1 and Kiwoong Kim1 1 Korea Research Institute of Standards and Science, South Korea For accurate diagnosis and high-throughput screening of ischemic heart disease or arrhythmia, high-sensitivity economic MCG system is needed. We fabricated an MCG system having axial gradiometers with low stray pickup area and dewar with low boil-off rate of liquid He. The axial gradiometers have very simple structure for the superconductive connection. The two ends of pickup coil wires were placed near the input coil pads of SQUID, and annealed Nb wires were bonded directly between pickup coil wires and input coil pads. In this way, the stray pickup area (intrinsic balance) made by the connection structure is about 0.1 % of the pickup coil area, and the gradiometers can be operated inside a thin magnetically shielded room. The baseline of the first-order gradiometer is 70 mm, and diameter of pickup coil is 20 mm. The neck diameter of the dewar is smaller than the diameter of gradiometer array (dewar inner bottom). By dividing the gradiometer array into 4 plates, each plate can be installed separately into the dewar bottom. In this way, the boil-off rate of liquid He can be reduced to 3 L/day, for the inner bottom diameter of 280 mm. The SQUIDs are double relaxation oscillation SQUIDs with large flux-to-voltage transfer coefficients, enabling compact flux-locked loop electronics. The developed 64-channel system was installed inside a thin (80 mm thick) shielded room, and showed field noise level of 3 fT/sqrt(Hz) at 100 Hz. Measurements of adult and fetal MCG signals were done successfully using the developed system. Analysis software allows parameter analysis for the screening of ischemic heart disease and 3-dimensional imaging of myocardium current (reentry current source) on the realistic image of the heart. Conference: Biomag 2010 - 17th International Conference on Biomagnetism , Dubrovnik, Croatia, 28 Mar - 1 Apr, 2010. Presentation Type: Poster Presentation Topic: MCG: Instrumentation, Modeling, Basic and Clinical Studies Citation: Lee Y, Yu K, Kwon H, Kim J and Kim K (2010). A High-sensitivity Magnetocardiography System with 64 Axial Gradiometers Inside a Low Boil-off Dewar. Front. Neurosci. Conference Abstract: Biomag 2010 - 17th International Conference on Biomagnetism . doi: 10.3389/conf.fnins.2010.06.00367 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: 08 Apr 2010; Published Online: 08 Apr 2010. * Correspondence: Yong-Ho Lee, Korea Research Institute of Standards and Science, Daejeon, South Korea, yhlee@kriss.re.kr 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 Yong-Ho Lee Kwon-Kyu Yu Hyukchan Kwon Jin-Mok Kim Kiwoong Kim Google Yong-Ho Lee Kwon-Kyu Yu Hyukchan Kwon Jin-Mok Kim Kiwoong Kim Google Scholar Yong-Ho Lee Kwon-Kyu Yu Hyukchan Kwon Jin-Mok Kim Kiwoong Kim PubMed Yong-Ho Lee Kwon-Kyu Yu Hyukchan Kwon Jin-Mok Kim Kiwoong Kim 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.