Projection-Reconstruction Spectroscopic Imaging forB0Field Plotting and Shimming without Pulsed Gradients |
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Authors: | Carl D. Gregory |
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Affiliation: | Biomedical Magnetic Resonance Laboratory, University of Illinois at Urbana–Champaign, 1307 West Park Street, Urbana, Illinois, 61801 |
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Abstract: | Shimming is important. Noniterative methods are desirable. Such methods exist for shimming a spectrometer with pulsed field gradients, generally based on field maps made by spin-warp Fourier imaging. For spectrometers with no pulsed gradients (or for cases whereT2is too short to permit echo imaging), an alternative method is presented: projection-reconstruction spectroscopic imaging, which can be accomplished using only the shim coils of a conventional spectrometer. Images so acquired can be used to map the field, even in the presence of multiple spectral components. Noniterative optimization of the axial shims of a GN-300 spectrometer is demonstrated using 1D + 1D spectroscopic images. Prospects for extending the technique to include the radial shims using 3D + 1D spectroscopic images are discussed. |
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Keywords: | shimming field mapping projection reconstruction spectroscopic imaging B0homogeneity |
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