Magnetic resonance imaging apparatus

Details Magnetic resonance imaging apparatus Magnetic resonance imaging apparatus

1992-08-31

1994-08-02

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324314, G01V 300

Patent

active

053349369

ABSTRACT:
In a magnetic resonance imaging apparatus adapted for a spin-echo method using a 90.degree. pulse as a selective excitation pulse and a 180.degree. pulse as a refocus pulse, MR signal is acquired with their phase difference changed in increments of a fixed angle with each frequency encoding step. This permits the phase difference between an echo signal used for imaging and an FID signal unnecessary for imaging to be changed in increments of the fixed angle with each encoding step. Thus, a zipper artifact based on the FID signal will be produced in a position corresponding to the fixed angle in an MR image reconstructed through Fourier transform of the acquired signal. The proper setting of the fixed angle of the phase difference permits the zipper artifact to be shifted to any position in the MR image.

REFERENCES:
patent: 4443760 (1984-04-01), Edelstein et al.
patent: 4698592 (1987-10-01), Feinberg
patent: 4714884 (1987-12-01), Glover
patent: 4873487 (1989-10-01), Van Der Meulen
patent: 4959611 (1990-09-01), Provost et al.
patent: 5027072 (1991-06-01), Rinaldi
patent: 5245283 (1993-09-01), Provost et al.

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