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. 2022 Apr 26;35(6):875–894. doi: 10.1007/s10334-022-01007-5

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© The Author(s) 2022

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Fig. 5 — (Left) Photograph of a moulded high permittivity ceramic helmet surrounding the head on a 3 T scanner. (Right) SNR maps from a subject, acquired with a 20-channel receive array head coil (top row), 64-channel receive array head coil (middle row), and 20-channel receive array coil with ceramic helmet (bottom row). The SNR maps were normalized by the corresponding acquired B₁⁺ map. Figures

reproduced from Ref. [34]