Nuclear magnetic resonance methods and apparatus

Details Nuclear magnetic resonance methods and apparatus Nuclear magnetic resonance methods and apparatus

1987-05-13

1988-07-26

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

047603372

ABSTRACT:
A method of nuclear magnetic resonance imaging wherein motion artifacts in the image are reduced by compensating for variations in the coupling between the RF transmitter and/or detector coils (9A, 9B and/or 10A, 10B) and the body (43) being imaged due to movement of the body. Compensation is suitably effected by measuring the position of the body (43) with respect to a datum immediately prior to each excitation of nuclear spins in the body and setting the amplitude of the applied RF excitation pulse B (90.degree.) and the detector sensitivity in dependence on the measured position.

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U.S. Patent Application Ser. No. 798,551, Advertisement, Radiology, vol. 158, No. 1, Jan., 1986; "Reducing MR Respiratory Motion Artifacts".
Runge, V. M. et al.; "Respiratory Gating in Magnetic Resonance Imaging at 0.5 Tesla", Radiology, May 1984, pp. 521-523.
Wood et al.; "MR Image Artifacts from Periodic Motion", Med. Phys. 12(2), Mar./Apr. 1985, pp. 143-155.

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