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An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners

M. Seoane, P.D. Ledger, A.J. Gil, M. Mallett, Paul Ledger, Antonio Gil Orcid Logo

International Journal for Numerical Methods in Engineering

Swansea University Authors: Paul Ledger, Antonio Gil Orcid Logo

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DOI (Published version): 10.1002/nme.6088

Abstract

Transient magnetic fields are generated by the gradient coils in an MRI scanner and induce eddy currents in their conducting components, which lead to vibrations, imaging artefacts, noise and the dissipation of heat. Heat dissipation can boil off the helium used to cool the super conducting magnets...

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Published in: International Journal for Numerical Methods in Engineering
ISSN: 0029-5981 1097-0207
Published: 2019
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URI: https://cronfa.swan.ac.uk/Record/cronfa50137
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first_indexed 2019-05-09T20:00:58Z
last_indexed 2019-07-17T21:31:51Z
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spelling 2019-07-17T17:13:55.2644882 v2 50137 2019-04-30 An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners 068dd31af167bcda33878951b2a01e97 Paul Ledger Paul Ledger true false 1f5666865d1c6de9469f8b7d0d6d30e2 0000-0001-7753-1414 Antonio Gil Antonio Gil true false 2019-04-30 FGSEN Transient magnetic fields are generated by the gradient coils in an MRI scanner and induce eddy currents in their conducting components, which lead to vibrations, imaging artefacts, noise and the dissipation of heat. Heat dissipation can boil off the helium used to cool the super conducting magnets and, if left unchecked, will lead to a magnet quench. Understanding the mechanisms involved in the generation of these vibrations, and the heat being deposited in the cryostat, are key for a successful MRI scanner design. This requires the solution of a coupled physics magneto‐mechanical problem, which will be addressed in this work. A novel computational methodology is proposed for the accurate simulation of the magneto‐mechanical problem using a Lagrangian approach, which with a particular choice of linearisation leads to a staggered scheme. This is discretised by high order finite elements leading to accurate solutions. We demonstrate the success of our scheme by applying it to realistic MRI scanner configurations. Journal Article International Journal for Numerical Methods in Engineering 0029-5981 1097-0207 31 12 2019 2019-12-31 10.1002/nme.6088 COLLEGE NANME Science and Engineering - Faculty COLLEGE CODE FGSEN Swansea University 2019-07-17T17:13:55.2644882 2019-04-30T14:21:45.8509766 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised M. Seoane 1 P.D. Ledger 2 A.J. Gil 3 M. Mallett 4 Paul Ledger 5 Antonio Gil 0000-0001-7753-1414 6 0050137-24062019130646.pdf seoane2019(3)v2.pdf 2019-06-24T13:06:46.1470000 Output 8337011 application/pdf Version of Record true 2019-06-24T00:00:00.0000000 Distributed under the terms of a Creative Commons Attribution (CC-BY-4.0) true eng
title An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
spellingShingle An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
Paul Ledger
Antonio Gil
title_short An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
title_full An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
title_fullStr An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
title_full_unstemmed An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
title_sort An accurate and efficient three‐dimensional high order finite element methodology for the simulation of magneto‐mechanical coupling in MRI scanners
author_id_str_mv 068dd31af167bcda33878951b2a01e97
1f5666865d1c6de9469f8b7d0d6d30e2
author_id_fullname_str_mv 068dd31af167bcda33878951b2a01e97_***_Paul Ledger
1f5666865d1c6de9469f8b7d0d6d30e2_***_Antonio Gil
author Paul Ledger
Antonio Gil
author2 M. Seoane
P.D. Ledger
A.J. Gil
M. Mallett
Paul Ledger
Antonio Gil
format Journal article
container_title International Journal for Numerical Methods in Engineering
publishDate 2019
institution Swansea University
issn 0029-5981
1097-0207
doi_str_mv 10.1002/nme.6088
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description Transient magnetic fields are generated by the gradient coils in an MRI scanner and induce eddy currents in their conducting components, which lead to vibrations, imaging artefacts, noise and the dissipation of heat. Heat dissipation can boil off the helium used to cool the super conducting magnets and, if left unchecked, will lead to a magnet quench. Understanding the mechanisms involved in the generation of these vibrations, and the heat being deposited in the cryostat, are key for a successful MRI scanner design. This requires the solution of a coupled physics magneto‐mechanical problem, which will be addressed in this work. A novel computational methodology is proposed for the accurate simulation of the magneto‐mechanical problem using a Lagrangian approach, which with a particular choice of linearisation leads to a staggered scheme. This is discretised by high order finite elements leading to accurate solutions. We demonstrate the success of our scheme by applying it to realistic MRI scanner configurations.
published_date 2019-12-31T04:01:28Z
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score 11.037603

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