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- W2057972503 abstract "Abstract MR imaging and spectroscopy allow the noninvasive measurement of brain function and physiology, but excellent magnetic field homogeneity is required for meaningful results. The homogenization of the magnetic field distribution in the mouse brain (i.e., shimming) is a difficult task due to complex susceptibility‐induced field distortions combined with the small size of the object. To date, the achievement of satisfactory whole brain shimming in the mouse remains a major challenge. The magnetic fields generated by a set of 48 circular coils (diameter 13 mm) that were arranged in a cylinder‐shaped pattern of 32 mm diameter and driven with individual dynamic current ranges of ±1 A are shown to be capable of substantially reducing the field distortions encountered in the mouse brain at 9.4 Tesla. Static multicoil shim fields allowed the reduction of the standard deviation of Larmor frequencies by 31% compared to second order spherical harmonics shimming and a 66% narrowing was achieved with the slice‐specific application of the multicoil shimming with a dynamic approach. For gradient echo imaging, multicoil shimming minimized shim‐related signal voids in the brain periphery and allowed overall signal gains of up to 51% compared to spherical harmonics shimming. Magn Reson Med, 2011. © 2011 Wiley‐Liss, Inc." @default.
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- W2057972503 date "2011-03-25" @default.
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- W2057972503 title "Multicoil shimming of the mouse brain" @default.
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- W2057972503 doi "https://doi.org/10.1002/mrm.22850" @default.
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