Nodal inhomogeneity mapping by localized excitation—the “NIMBLE” shimming technique for high-resolution in Vivo NMR spectroscopy
✍ Scribed by David M. Doddrell; Graham J. Galloway; Ian M. Brewton; William M. Brooks
- Publisher
- John Wiley and Sons
- Year
- 1988
- Tongue
- English
- Weight
- 332 KB
- Volume
- 7
- Category
- Article
- ISSN
- 0740-3194
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✦ Synopsis
A method (NIMBLE) for obtaining optimum B0 field homogeneity at voxels located away from the magnet isocenter for use in volume-selected NMR spectroscopy is described. Voxels may be shimmed using only first-order X, Y, and Z shims to produce three-dimensional shim current maps, thus avoiding shim coupling problems. NIMBLE shimming prior to volume selection ensures optimum spectral resolution and improves the efficiency and accuracy of the volume-selection experiment. The benefits of the technique are illustrated by a high-resolution volume-selected spectrum of human tibia marrow.