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ABSTRACT:
Alexander Pines and colleagues at Berkeley Labs have made it possible to obtain high resolution NMR and MRI without expensive and immobile superconducting magnets. The method uses advanced software control of the RF and gradient pulses to reshape the magnetic field produced by auxiliary coils, effectively substituting software for the bulky hardware used for conventional magnet shimming. The invention is anticipated to reduce the required homogeneity over the sample volume by an order of magnitude.
The Berkeley Lab invention reduces the linewidth of the NMR spectrum and provides non-distorted images using simpler, smaller, and less expensive gradient coils. It captures valuable structural and dynamic information that enables accurate material identification and product control. The shim pulse invention acquires spectra more rapidly and accommodates larger sample volumes than conventional magnet systems. Multiple samples can also be examined simultaneously.
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