Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI

An acoustic control scheme is proposed in this paper through the process of gradient coil design for magnetic resonance imaging (MRI). With a finite-difference-based method, the stream function and coil displacement caused by fast gradient switching can be unified by a simplified momentum equation,...

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Autores principales:	Liyi Kang, Ling Xia
Formato:	article
Lenguaje:	EN
Publicado:	Hindawi Limited 2021
Materias:	Mathematics QA1-939
Acceso en línea:	https://doaj.org/article/e8afb1d5db9a4a01aa94ec10825918e5
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id	oai:doaj.org-article:e8afb1d5db9a4a01aa94ec10825918e5
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spelling	oai:doaj.org-article:e8afb1d5db9a4a01aa94ec10825918e52021-11-08T02:37:11ZAcoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI1607-887X10.1155/2021/3719618https://doaj.org/article/e8afb1d5db9a4a01aa94ec10825918e52021-01-01T00:00:00Zhttp://dx.doi.org/10.1155/2021/3719618https://doaj.org/toc/1607-887XAn acoustic control scheme is proposed in this paper through the process of gradient coil design for magnetic resonance imaging (MRI). With a finite-difference-based method, the stream function and coil displacement caused by fast gradient switching can be unified by a simplified momentum equation, which can be incorporated into the conventional gradient coil design. A three-dimensional transverse gradient coil with an edge-connected cylindrical structure is used as a design example to verify the proposed design method. In addition, an acoustic model is established to simulate the sound pressure level (SPL).In the model, two hemispherical air volumes are added flush with the ends of the cylindrical main magnet to mimic the free propagation of sound waves on the boundaries. The simulation results show that by optimizing coil displacement, the overall SPL can be attenuated by 4 dB over the frequency range from 0 to 3000 Hz with the displacement reduced by about 50%, at the cost of a figure of merit (FOM) loss by about 8%. Therefore, the proposed acoustic control scheme can be used as a complement to conventional acoustic control methods for further noise reduction.Liyi KangLing XiaHindawi LimitedarticleMathematicsQA1-939ENDiscrete Dynamics in Nature and Society, Vol 2021 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mathematics QA1-939
spellingShingle	Mathematics QA1-939 Liyi Kang Ling Xia Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
description	An acoustic control scheme is proposed in this paper through the process of gradient coil design for magnetic resonance imaging (MRI). With a finite-difference-based method, the stream function and coil displacement caused by fast gradient switching can be unified by a simplified momentum equation, which can be incorporated into the conventional gradient coil design. A three-dimensional transverse gradient coil with an edge-connected cylindrical structure is used as a design example to verify the proposed design method. In addition, an acoustic model is established to simulate the sound pressure level (SPL).In the model, two hemispherical air volumes are added flush with the ends of the cylindrical main magnet to mimic the free propagation of sound waves on the boundaries. The simulation results show that by optimizing coil displacement, the overall SPL can be attenuated by 4 dB over the frequency range from 0 to 3000 Hz with the displacement reduced by about 50%, at the cost of a figure of merit (FOM) loss by about 8%. Therefore, the proposed acoustic control scheme can be used as a complement to conventional acoustic control methods for further noise reduction.
format	article
author	Liyi Kang Ling Xia
author_facet	Liyi Kang Ling Xia
author_sort	Liyi Kang
title	Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
title_short	Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
title_full	Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
title_fullStr	Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
title_full_unstemmed	Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI
title_sort	acoustic control through gradient coil design using a finite-difference-based method for mri
publisher	Hindawi Limited
publishDate	2021
url	https://doaj.org/article/e8afb1d5db9a4a01aa94ec10825918e5
work_keys_str_mv	AT liyikang acousticcontrolthroughgradientcoildesignusingafinitedifferencebasedmethodformri AT lingxia acousticcontrolthroughgradientcoildesignusingafinitedifferencebasedmethodformri
_version_	1718443050904059904

Acoustic Control through Gradient Coil Design Using a Finite-Difference-Based Method for MRI

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