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  Design of a shim coil array matched to the human brain anatomy

Jia, F., Elshatlawy, H., Aghaeifar, A., Chu, Y., Hsu, Y., Littin, S., et al. (2019). Design of a shim coil array matched to the human brain anatomy. Magnetic Resonance in Medicine, Epub ahead. doi:10.1002/mrm.28016.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0004-C6D8-9 Version Permalink: http://hdl.handle.net/21.11116/0000-0004-C6DA-7
Genre: Journal Article

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 Creators:
Jia, F, Author
Elshatlawy, H, Author
Aghaeifar, A1, 2, Author              
Chu, YH, Author
Hsu, YC, Author
Littin, S, Author
Kroboth, S, Author
Yu, H, Author
Amrein, P, Author
Gao, X, Author
Yang, W, Author
LeVan, P, Author
Scheffler, K1, 2, Author              
Zaitsev, M, Author
Affiliations:
1Department High-Field Magnetic Resonance, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497796              
2Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              

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 Abstract: Purpose The purpose of this study is to introduce a novel design method of a shim coil array specifically optimized for whole brain shimming and to compare the performance of the resulting coils to conventional spherical harmonic shimming. Methods The proposed design approach is based on the stream function method and singular value decomposition. Eighty‐four field maps from 12 volunteers measured in seven different head positions were used during the design process. The cross validation technique was applied to find an optimal number of coil elements in the array. Additional 42 field maps from 6 further volunteers were used for an independent validation. A bootstrapping technique was used to estimate the required population size to achieve a stable coil design. Results Shimming using 12 and 24 coil elements outperforms fourth‐ and fifth‐order spherical harmonic shimming for all measured field maps, respectively. Coil elements show novel coil layouts compared to the conventional spherical harmonic coils and existing multi‐coils. Both leave‐one‐out and independent validation demonstrate the generalization ability of the designed arrays. The bootstrapping analysis predicts that field maps from approximately 140 subjects need to be acquired to arrive at a stable design. Conclusions The results demonstrate the validity of the proposed method to design a shim coil array matched to the human brain anatomy, which naturally satisfies the laws of electrodynamics. The design method may also be applied to develop new shim coil arrays matched to other human organs.

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 Dates: 2019-09
 Publication Status: Published online
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 Identifiers: DOI: 10.1002/mrm.28016
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Title: Magnetic Resonance in Medicine
Source Genre: Journal
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Publ. Info: New York : Wiley-Liss
Pages: - Volume / Issue: Epub ahead Sequence Number: - Start / End Page: - Identifier: ISSN: 0740-3194
CoNE: https://pure.mpg.de/cone/journals/resource/954925538149