Constant gradient elastography with optimal control RF pulses
[Display omitted] •Specifically designed radio-frequency pulses are used to perform motion encoding.•Magnetic Resonance Elastography is performed with only a constant gradient.•An analytic development is provided to detail the motion encoding mechanism.•Superior phase-to-noise ratio is obtained comp...
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| Published in: | Journal of magnetic resonance (1997) Vol. 294; pp. 153 - 161 |
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| Main Authors: | , , , , , , , , , , |
| Format: | Journal Article |
| Language: | English |
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01.09.2018
Elsevier |
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| ISSN: | 1090-7807, 1096-0856, 1096-0856 |
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| Abstract | [Display omitted]
•Specifically designed radio-frequency pulses are used to perform motion encoding.•Magnetic Resonance Elastography is performed with only a constant gradient.•An analytic development is provided to detail the motion encoding mechanism.•Superior phase-to-noise ratio is obtained compared to standard encoding methods.
This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a tailored RF pulse is designed to simultaneously perform selective excitation and motion encoding in presence of a constant gradient. The RF pulse is designed with a numerical optimal control algorithm, in order to obtain a magnetization phase distribution that depends on the displacement characteristics inside each voxel. As a consequence, no post-excitation encoding gradients are required. This offers numerous advantages, such as reducing eddy current artifacts, and relaxing the constraint on the gradients maximum switch rate. It also allows to perform MRE with ultra-short TE acquisition schemes, which limits T2 decay and optimizes signal-to-noise ratio. The pulse design strategy is developed and analytically analyzed to clarify the encoding mechanism. Finally, simulations, phantom and ex vivo experiments show that phase-to-noise ratios are improved when compared to standard MRE encoding strategies. |
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| AbstractList | [Display omitted]
•Specifically designed radio-frequency pulses are used to perform motion encoding.•Magnetic Resonance Elastography is performed with only a constant gradient.•An analytic development is provided to detail the motion encoding mechanism.•Superior phase-to-noise ratio is obtained compared to standard encoding methods.
This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a tailored RF pulse is designed to simultaneously perform selective excitation and motion encoding in presence of a constant gradient. The RF pulse is designed with a numerical optimal control algorithm, in order to obtain a magnetization phase distribution that depends on the displacement characteristics inside each voxel. As a consequence, no post-excitation encoding gradients are required. This offers numerous advantages, such as reducing eddy current artifacts, and relaxing the constraint on the gradients maximum switch rate. It also allows to perform MRE with ultra-short TE acquisition schemes, which limits T2 decay and optimizes signal-to-noise ratio. The pulse design strategy is developed and analytically analyzed to clarify the encoding mechanism. Finally, simulations, phantom and ex vivo experiments show that phase-to-noise ratios are improved when compared to standard MRE encoding strategies. This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a tailored RF pulse is designed to simultaneously perform selective excitation and motion encoding in presence of a constant gradient. The RF pulse is designed with a numerical optimal control algorithm, in order to obtain a magnetization phase distribution that depends on the displacement characteristics inside each voxel. As a consequence, no post-excitation encoding gradients are required. This offers numerous advantages, such as reducing eddy current artifacts, and relaxing the constraint on the gradients maximum switch rate. It also allows to perform MRE with ultra-short TE acquisition schemes, which limits T decay and optimizes signal-to-noise ratio. The pulse design strategy is developed and analytically analyzed to clarify the encoding mechanism. Finally, simulations, phantom and ex vivo experiments show that phase-to-noise ratios are improved when compared to standard MRE encoding strategies. This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a tailored RF pulse is designed to simultaneously perform selective excitation and motion encoding in presence of a constant gradient. The RF pulse is designed with a numerical optimal control algorithm, in order to obtain a magnetization phase distribution that depends on the displacement characteristics inside each voxel. As a consequence, no post-excitation encoding gradients are required. This offers numerous advantages, such as reducing eddy current artifacts, and relaxing the constraint on the gradients maximum switch rate. It also allows to perform MRE with ultra-short TE acquisition schemes, which limits T2 decay and optimizes signal-to-noise ratio. The pulse design strategy is developed and analytically analyzed to clarify the encoding mechanism. Finally, simulations, phantom and ex vivo experiments show that phase-to-noise ratios are improved when compared to standard MRE encoding strategies.This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a tailored RF pulse is designed to simultaneously perform selective excitation and motion encoding in presence of a constant gradient. The RF pulse is designed with a numerical optimal control algorithm, in order to obtain a magnetization phase distribution that depends on the displacement characteristics inside each voxel. As a consequence, no post-excitation encoding gradients are required. This offers numerous advantages, such as reducing eddy current artifacts, and relaxing the constraint on the gradients maximum switch rate. It also allows to perform MRE with ultra-short TE acquisition schemes, which limits T2 decay and optimizes signal-to-noise ratio. The pulse design strategy is developed and analytically analyzed to clarify the encoding mechanism. Finally, simulations, phantom and ex vivo experiments show that phase-to-noise ratios are improved when compared to standard MRE encoding strategies. |
| Author | Van Reeth, Eric Lefebvre, Pauline M. Beuf, Olivier Ratiney, Hélène Grenier, Denis Lambert, Simon A. Sugny, Dominique Tesch, Michael Brusseau, Elisabeth Glaser, Steffen J. Tse-Ve-Koon, Kevin |
| Author_xml | – sequence: 1 givenname: Eric surname: Van Reeth fullname: Van Reeth, Eric email: eric.van-reeth@creatis.insa-lyon.fr organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 2 givenname: Pauline M. surname: Lefebvre fullname: Lefebvre, Pauline M. organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 3 givenname: Hélène surname: Ratiney fullname: Ratiney, Hélène organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 4 givenname: Simon A. surname: Lambert fullname: Lambert, Simon A. organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 5 givenname: Michael surname: Tesch fullname: Tesch, Michael organization: Department of Chemistry, Technische Universität München, Germany – sequence: 6 givenname: Elisabeth surname: Brusseau fullname: Brusseau, Elisabeth organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 7 givenname: Denis surname: Grenier fullname: Grenier, Denis organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 8 givenname: Olivier surname: Beuf fullname: Beuf, Olivier organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France – sequence: 9 givenname: Steffen J. surname: Glaser fullname: Glaser, Steffen J. organization: Department of Chemistry, Technische Universität München, Germany – sequence: 10 givenname: Dominique surname: Sugny fullname: Sugny, Dominique organization: ICB, CNRS UMR6303, Université de Bourgogne, France – sequence: 11 givenname: Kevin surname: Tse-Ve-Koon fullname: Tse-Ve-Koon, Kevin organization: CREATIS, CNRS UMR5220, INSERM U1206, Université Lyon 1, INSA Lyon, Université Jean Monnet Saint-Etienne, France |
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| Copyright | 2018 Elsevier Inc. Copyright © 2018 Elsevier Inc. All rights reserved. Distributed under a Creative Commons Attribution 4.0 International License |
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| Keywords | Bloch equations Elastography Optimal control Pulse design |
| Language | English |
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•Specifically designed radio-frequency pulses are used to perform motion encoding.•Magnetic Resonance Elastography is performed with only a... This article presents a new motion encoding strategy to perform magnetic resonance elastography (MRE). Instead of using standard motion encoding gradients, a... |
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| SubjectTerms | Bioengineering Bloch equations Computer Science Elastography Imaging Life Sciences Medical Imaging Optimal control Pulse design |
| Title | Constant gradient elastography with optimal control RF pulses |
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