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Ultra-low field magnetic resonance imaging detection with gradient tensor compensation in urban unshielded environment
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10.1063/1.4795516
/content/aip/journal/apl/102/10/10.1063/1.4795516
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4795516
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic of the ULF MRI system.

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

(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.

Image of FIG. 4.
FIG. 4.

(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.

Image of FIG. 5.
FIG. 5.

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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/content/aip/journal/apl/102/10/10.1063/1.4795516
2013-03-15
2014-04-19
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Ultra-low field magnetic resonance imaging detection with gradient tensor compensation in urban unshielded environment
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/10/10.1063/1.4795516
10.1063/1.4795516
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