Method of and device for determining a spin resonance distributi

Details Method of and device for determining a spin resonance distributi Method of and device for determining a spin resonance distributi

1989-06-09

1991-03-05

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

049980645

ABSTRACT:
An MRI method is proposed where the profile distribution is automatically determined so that the information contents of the image are maximum, subject to the restriction that the total number of profiles used to obtain the image is predetermined. During the determination of the profile distribution, profiles will be selected which have a minium redundancy and a redundancy pattern r(k.sub.y) will be dynamically adapted as a function of the spatial frequency k.sub.y. The redundancy of a profile increases as the number of times that a profile has been measured increases and is high when a signal-to-noise ratio associated with the profile is very small.

REFERENCES:
patent: 4739266 (1988-04-01), Kanz
patent: 4818941 (1989-04-01), McKinnon
patent: 4825160 (1989-04-01), Kahn
M. Fuderer: "Ringing artefact reduction by an efficient likelihood improvement method", Sixth Annual Meeting on the Society for Magnetic Resonance Imaging, Feb. 1988, & Magnetic Resonance Imaging, vol. 6, supplement 1, 1988, p. 19, abstract No. P37, Pergamon Press.
B. C. De Simone et al: "Maximum entropy method in phase-encoding NMR imaging", Magnetic Resonance in Medicine, vol. 4, 1987, pp. 78-82, Academic Press, Inc.
R. T. Constable et al: "Maximum entropy reconstruction in MRI" Medical Physics, vol. 14, No. 4, Jul/Aug. 1987, p. 710, abstract No. WP3-6.

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