Magnetic resonance device

Details Magnetic resonance device Magnetic resonance device

1992-11-25

1994-10-25

Wieder, Kenneth A.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3340

Patent

active

053592891

ABSTRACT:
In known magnetic resonance devices shimming is applied on the basis of maps of field inhomogeneities obtained from two images of a slice of an object by formation of a ratio image thereof. This ratio image is processed in order to obtain shimming information. These known methods are time-consuming and cumbersome. The invention proposes a fast and simple shimming method which utilizes only one measuring sequence or a few measuring sequences. The shimming gradient (-dG) is determined from a time shift between an anticipated temporal position (t1) and a measured temporal position (t1') of a maximum of an echo resonance signal (ec) produced by the measuring sequence.

REFERENCES:
patent: 4677318 (1987-06-01), Sekihara et al.
patent: 4791369 (1988-12-01), Yamamoto et al.
patent: 4899109 (1990-02-01), Tropp
patent: 4987371 (1991-01-01), Glover et al.
patent: 5099207 (1992-03-01), Luyten
patent: 5168232 (1992-12-01), Glover
"Rapid Fully Automatic, Arbitrary Volume in Vivo Shimming" Webb et al, Mag. Res. in Medicine, vol. 20, No. 1, Jul. 1, 1991 pp. 113-122.
"A New Approach to Automatic Shimming" Prammer et al, Journal of Magnetic Resonance, vol. 77, No. 1, Mar. 1988, pp. 40-52.
"Principe de cartographie d'un cham magnetique par une methode d'imagerie fondee sur la sequence d'echos stimules" Briguet et al, Comptes Rendus de l'Academie des Sciences vol. 306, No. 15, Apr. 21, 1988.

Affiliated with

Also associated with

Rating

Magnetic resonance device does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Magnetic resonance device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic resonance device will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-138103