Technique for shifting out-of-slice artifacts to the edge of the

Details Technique for shifting out-of-slice artifacts to the edge of the Technique for shifting out-of-slice artifacts to the edge of the

1991-08-07

1993-09-14

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

052452832

ABSTRACT:
A magnetic resonance imaging sequence (FIG. 2 ) is applied with a phase encode gradient (60) between an RF excitation pulse (50) and a refocusing pulse (54) such that out-of-slice artifacts are collapsed into a single line or column (64) in a resultant image display (38). A digital radio frequency transmitter (20) adds an adjustable RF phase component (70) to the excitation pulse and digital radio frequency receiver (26) adds the inverse or negative of the phase component (72) to a received magnetic resonance echo (56). The RF phase increment is adjusted such that the artifact line is displayed at the edge or other selected portion of the resultant image away from a region (74) of primary interest. An operator control (80) enables the field of view to be shifted in the phase encode direction to view different portions of the patient along the phase encode axis. As the field of view is translated, the RF phase increment is adjusted correspondingly and the reconstructed image representation is rebinned (82) such that the artifact line remains at the edge of the image display.

REFERENCES:
patent: 4484138 (1984-11-01), Bottomley et al.
patent: 4706023 (1987-11-01), Den Boef
patent: 4959611 (1990-09-01), Provost et al.
patent: 4962357 (1990-10-01), Sotak
patent: 4994743 (1991-02-01), Glover et al.
patent: 5027072 (1991-06-01), Rinaldi
patent: 5093619 (1992-03-01), Hennig
patent: 5101156 (1992-03-01), Pelc

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