Method and apparatus for magnetic resonance imaging

Details Method and apparatus for magnetic resonance imaging Method and apparatus for magnetic resonance imaging

1993-05-27

1995-04-25

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

054102499

ABSTRACT:
In a magnetic resonance imaging method multiple refocusing RF-pulses (22-26) are applied and spin-echo signals (62-66) obtained following an excitation RF-pulse (21). Imperfections in the applied RF-pulses (21-26) and the switched gradient magnetic fields (31-36, 42-46, 51-56) cause deviations from the desired phases of the nuclear dipole moments which appear as artefacts or ghosts in a resulting image. By a suitable arrangement of the application of the phase encoding values (242-248; 342-348) imposed during the measurements and/or the addition of supplemental measurements, the effects of the phase deviations in an image are significantly reduced, resulting in images in which less artefacts and ghosts are visible. Reduction of artefacts is also obtained by weighting of measured NMR-signals.

REFERENCES:
patent: 4709211 (1987-11-01), Machida et al.
patent: 4713615 (1987-12-01), Barratt et al.
patent: 4714884 (1987-12-01), Glover
patent: 4818940 (1989-04-01), Henning et al.

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