Artefact suppression in GRASE Mr imaging

Details Artefact suppression in GRASE Mr imaging Artefact suppression in GRASE Mr imaging

1994-07-08

1996-10-01

Arana, Louis M.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

055613705

ABSTRACT:
In MRI data acquisition according to the GRASE (gradient and spin-echo) sequence, trajectories (562, 563) in k-space are arranged such that different coordinates (k.sub.x, k.sub.y) in that space have monotonic relations with parameters (t, .tau.) that are related to physical effects, such as magnetic field inhomogeneities, T.sub.2 *-effects and motion, that causes artefacts in the image. By doing so, the artefacts are reduced.

REFERENCES:
patent: 4901020 (1990-02-01), Ladebeck et al.
patent: 5270653 (1993-12-01), Pauly
patent: 5296808 (1994-03-01), Macovski
patent: 5361028 (1994-11-01), Kanayama et al.
GRASE (Gradient-and Spin Echo) MR Imaging: A New Fast Clinical Imaging Technique, D.A. Feinberg et al, Radiology, vol. 181, p. 597-602 (1991).
Gradient Echo Shifting in Fast MRI Techniques (GRASE Shifting) For Correction in Field Inhomogeneity Errors and Chemical Shift, D. Feinberg et al, Journal of Magnetic Resonance 97, p. 177-183.

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