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Schematic of the ULF MRI system.
(a) Fluxgate configuration for gradient field tensor detection. Six triaxial fluxgate units (18 fluxgates) are positioned at the indicated locations. (b) depicts the continuously measured environmental gradient field G xz over 4 h time.
(a) The gradient compensation coil system. It consists of 6 sets of coil pairs generating , , , , , and ; (b) and (c) the FID signals with G xx and G xx + G xy + G xz applied; (d) the FID signal (the black trace) obtained after all six components are compensated, and the multi-echo train (the gray line) recorded without gradient compensation. All the FID signals were averaged 5 times.
(a) FID and spin echo signals of a slice of winter melon. The number of averages is 25. The inset shows a photo of the sample, with outer diameter of 4 cm and inner diameter of 2 cm. The MRI images reconstructed from echo signals are depicted: (b) single shot and (c) 25 times averaged.
The FID signal of two-bottle water sample with sample-magnet distance of 0.5 m. The inset is its FID signal without gradient field compensation.
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