Method for rapid magnet shimming

Details Method for rapid magnet shimming Method for rapid magnet shimming

1990-06-29

1992-12-01

Williams, Hezron E.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324307, G01R 3320

Patent

active

051682320

ABSTRACT:
Determination of the shimming fields for a polarizing NMR magnet is performed by acquiring two NMR images with evolution times differing by .tau.. A pixel by pixel division of the images yields a third image whose phase is proportional to magnetic field inhomogeneity. Several such inhomogeneity images are acquired within a cylindrical volume and the data of the images is fit according to a set of polynomials approximating the fields of the magnet shim coils. The coefficients of this fitting procedure are used to set the current level in the corresponding shim coils. The interaction between correction fields is accommodated by an empirically derived correction matrix. This procedure may be repeated to provide more accurate shimming.

REFERENCES:
patent: 4740753 (1988-04-01), Glover et al.
patent: 4749948 (1988-06-01), Duby et al.
patent: 4987371 (1991-01-01), Glover et al.

Affiliated with

Also associated with

Rating

Method for rapid magnet shimming does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method for rapid magnet shimming, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for rapid magnet shimming will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-504787