A simple theory for vibration of MRI gradient coils
Autor(a) principal: | |
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Data de Publicação: | 2006 |
Outros Autores: | |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Brazilian Journal of Physics |
Texto Completo: | http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000100009 |
Resumo: | Vibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for the vibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonant modes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonance frequencies depend on l and the Young modulus, as well as on the current distribution. Under longitudinal gradient pulses, anti-symmetrical modes of surface vibration are produced due to the symmetry of current distribution. In contrast, transverse gradient pulses produce coil bending that results in symmetrical vibration modes of the coil axis. The viscosity of the assembly materials controls the width of the vibrational resonance modes. Experimental results are in agreement with this simple string model. |
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Brazilian Journal of Physics |
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A simple theory for vibration of MRI gradient coilsMRIMRI coilsVibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for the vibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonant modes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonance frequencies depend on l and the Young modulus, as well as on the current distribution. Under longitudinal gradient pulses, anti-symmetrical modes of surface vibration are produced due to the symmetry of current distribution. In contrast, transverse gradient pulses produce coil bending that results in symmetrical vibration modes of the coil axis. The viscosity of the assembly materials controls the width of the vibrational resonance modes. Experimental results are in agreement with this simple string model.Sociedade Brasileira de Física2006-03-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersiontext/htmlhttp://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000100009Brazilian Journal of Physics v.36 n.1a 2006reponame:Brazilian Journal of Physicsinstname:Sociedade Brasileira de Física (SBF)instacron:SBF10.1590/S0103-97332006000100009info:eu-repo/semantics/openAccessTomasi,D.Ernst,T.eng2006-04-03T00:00:00Zoai:scielo:S0103-97332006000100009Revistahttp://www.sbfisica.org.br/v1/home/index.php/pt/ONGhttps://old.scielo.br/oai/scielo-oai.phpsbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br1678-44480103-9733opendoar:2006-04-03T00:00Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF)false |
dc.title.none.fl_str_mv |
A simple theory for vibration of MRI gradient coils |
title |
A simple theory for vibration of MRI gradient coils |
spellingShingle |
A simple theory for vibration of MRI gradient coils Tomasi,D. MRI MRI coils |
title_short |
A simple theory for vibration of MRI gradient coils |
title_full |
A simple theory for vibration of MRI gradient coils |
title_fullStr |
A simple theory for vibration of MRI gradient coils |
title_full_unstemmed |
A simple theory for vibration of MRI gradient coils |
title_sort |
A simple theory for vibration of MRI gradient coils |
author |
Tomasi,D. |
author_facet |
Tomasi,D. Ernst,T. |
author_role |
author |
author2 |
Ernst,T. |
author2_role |
author |
dc.contributor.author.fl_str_mv |
Tomasi,D. Ernst,T. |
dc.subject.por.fl_str_mv |
MRI MRI coils |
topic |
MRI MRI coils |
description |
Vibrations of a string can provide a model for vibrations of MRI coil assemblies. The string model for the vibrations of MRI coils is presented, and compared with experimental results. Gradient coils exhibit resonant modes because of the finite coil length, l, and the elasticity of materials that comprise the assembly. The resonance frequencies depend on l and the Young modulus, as well as on the current distribution. Under longitudinal gradient pulses, anti-symmetrical modes of surface vibration are produced due to the symmetry of current distribution. In contrast, transverse gradient pulses produce coil bending that results in symmetrical vibration modes of the coil axis. The viscosity of the assembly materials controls the width of the vibrational resonance modes. Experimental results are in agreement with this simple string model. |
publishDate |
2006 |
dc.date.none.fl_str_mv |
2006-03-01 |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000100009 |
url |
http://old.scielo.br/scielo.php?script=sci_arttext&pid=S0103-97332006000100009 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
10.1590/S0103-97332006000100009 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
text/html |
dc.publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
publisher.none.fl_str_mv |
Sociedade Brasileira de Física |
dc.source.none.fl_str_mv |
Brazilian Journal of Physics v.36 n.1a 2006 reponame:Brazilian Journal of Physics instname:Sociedade Brasileira de Física (SBF) instacron:SBF |
instname_str |
Sociedade Brasileira de Física (SBF) |
instacron_str |
SBF |
institution |
SBF |
reponame_str |
Brazilian Journal of Physics |
collection |
Brazilian Journal of Physics |
repository.name.fl_str_mv |
Brazilian Journal of Physics - Sociedade Brasileira de Física (SBF) |
repository.mail.fl_str_mv |
sbfisica@sbfisica.org.br||sbfisica@sbfisica.org.br |
_version_ |
1754734862633271296 |