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. 2019 Oct 30;6:244. doi: 10.1038/s41597-019-0254-8

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Fig. 6 — Signal-to-noise ratio (SNR) analysis of coil performance. Representative SNR maps are shown in the sagittal (top row), coronal (middle row) and axial (bottom row) planes for a test brain sample immersed in periodate-lysine-paraformaldehyde. The maps demonstrate an SNR gain of 1.6-fold for the 31-channel 7 Tesla (7 T) ex vivo coil (left column) compared to the 31-channel 7 T standard coil (middle column), and a gain of 3.3-fold compared to the 64-channel 3 T head coil (right column). The noise coupling between channels was 11% for the 31-channel ex vivo coil array, a 2-fold improvement relative to our previous array¹⁸.