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  On the Contribution of Curl-Free Current Patterns to the Ultimate Intrinsic Signal-to-Noise Ratio at Ultra-High Field Strength

Pfrommer, A., & Henning, A. (2017). On the Contribution of Curl-Free Current Patterns to the Ultimate Intrinsic Signal-to-Noise Ratio at Ultra-High Field Strength. NMR in Biomedicine, 30(5), 1-16. doi:10.1002/nbm.3691.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0000-C30B-8 Version Permalink: http://hdl.handle.net/21.11116/0000-0001-1EF2-D
Genre: Journal Article

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Pfrommer, A1, 2, Author              
Henning, A1, 2, Author              
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1Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_1497794              
2Research Group MR Spectroscopy and Ultra-High Field Methodology, Max Planck Institute for Biological Cybernetics, Max Planck Society, ou_2528692              

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 Abstract: The ultimate intrinsic signal-to-noise ratio (SNR) is a coil independent performance measure to compare different receive coil designs. To evaluate this benchmark in a sample, a complete electromagnetic basis set is required. The basis set can be obtained by curl-free and divergence-free surface current distributions, which excite linearly independent solutions to Maxwell's equations. In this work, we quantitatively investigate the contribution of curl-free current patterns to the ultimate intrinsic SNR in a spherical head-sized model at 9.4 T. Therefore, we compare the ultimate intrinsic SNR obtained with having only curl-free or divergence-free current patterns, with the ultimate intrinsic SNR obtained from a combination of curl-free and divergence-free current patterns. The influence of parallel imaging is studied for various acceleration factors. Moreover results for different field strengths (1.5 T up to 11.7 T) are presented at specific voxel positions and acceleration factors. The full-wave electromagnetic problem is analytically solved using dyadic Green's functions. We show, that at ultra-high field strength (B0⩾7T) a combination of curl-free and divergence-free current patterns is required to achieve the best possible SNR at any position in a spherical head-sized model. On 1.5- and 3T platforms, divergence-free current patterns are sufficient to cover more than 90 of the ultimate intrinsic SNR.

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 Dates: 2017-05
 Publication Status: Published in print
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 Identifiers: DOI: 10.1002/nbm.3691
BibTex Citekey: PfrommerH2017
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Title: NMR in Biomedicine
Source Genre: Journal
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Pages: - Volume / Issue: 30 (5) Sequence Number: - Start / End Page: 1 - 16 Identifier: eDoc: e3691