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. 2017 Jul 31;7:6872. doi: 10.1038/s41598-017-06992-5

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© The Author(s) 2017

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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Raw data analysis. The first image shows the absolute value of the SM component with the highest SNR for the preinstalled coil and the gradiometer coil. As the dilution samples are moved on the x axis, the resulting harmonic magnitude over time are expected to match the profile of these patterns shown in the second plot. The dilution raw data plots contain the unprocessed time data of the selected harmonics for the dilution samples at 11 positions in the FOV and a 12th position outside the scanner bore. Thus, the last part of the plot is actually an empty measurement. It is visible that the gradiometer is misplaced slightly causing a non-symmetric influence of the coil sensitivity.