Method for automatically shimming a high resolution NMR magnet

Details Method for automatically shimming a high resolution NMR magnet Method for automatically shimming a high resolution NMR magnet

1993-03-11

1994-08-30

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324319, G01V 300

Patent

active

053431510

ABSTRACT:
A plurality of measurements are made with a probe containing a material sample with a known frequency spectrum. The probe is positioned in one spot in the magnet bore in the presence of a field gradient along a predetermined axis. Prior to each measurement, the gradient strength is increased by a predetermined constant amount. The resulting measurement values are mathematically manipulated to yield a set of values which can be used to set the shim coil currents based on known equations for the field generated by each shim coil. The method can be used with a material sample with a simple NMR spectrum or a complex NMR spectrum. If a sample with a complex NMR spectrum is employed in the measurement, the spectral complexity can be removed by deconvolution during the manipulation of the measurement values.

REFERENCES:
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Poster at the International Conference on NMR Microscopy, Heidelberg, Germany, Sep. 16-19, 1991.
Chmurny et al., The Ancient and Honourable Art of Shimming, Concepts in Magnetic Resonance, vol. 2, pp. 131-149, 1990.
Cory et al., Chemical-Shift-Resolved Back-Projection Imaging, Journal of Magnetic Resonance, vol. 85, pp. 219-227, 1989.

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