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

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© The Author(s) 2019

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Fig. 2 — Receive array coil and transmit volume coil for ex vivo imaging of the whole human brain. (a) The 31-channel receive array has 15 elements on the top half (with a diameter of 5.5 cm) and 16 on the bottom half (with a diameter of 8.5 cm), each made of 16 AWG wire loops with four or five evenly spaced capacitors. All elements are tuned to 297.2 MHz. (c) The coil former has slightly larger dimensions than the brain holder, which slides inside a volume coil (b). (d) A custom air-tight brain holder was designed to conform to the shape of a whole human brain. The brain holder is an oblate spheroid container (16 × 19 cm) with degassing ports that are used to apply a vacuum suction, thereby reducing air bubbles in the specimen and surrounding fomblin solution.