Magnetic resonance apparatus employing delayed self-refocusing R

Details Magnetic resonance apparatus employing delayed self-refocusing R Magnetic resonance apparatus employing delayed self-refocusing R

1992-07-27

1994-01-18

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324314, G01V 300

Patent

active

052802450

ABSTRACT:
MRI Apparatus for obtaining a spin-echo signal applies a self-refocusing RF pulse with variable delay in the spin-echo signals following application of the RF pulse. The RF pulse is designed using the Shinnar-LeRoux algorithm B.sub.1 (t)=SLR.sup.-1 {A.sub.n (z), B.sub.n (z) } with A.sub.n '(z) substituted for A.sub.n (z).
A.sub.n '(z) is slightly non-minimum phase and equals P(z) A.sub.n (z) where P(z) is a unit amplitude phase function chosen to compensate the phase of B.sub.n (z). The RF pulse can be designed for a specific delay, a specific power constraint, and small tip angle.

REFERENCES:
patent: 4940940 (1990-07-01), Leroux
patent: 4988947 (1991-01-01), Ugurbil et al.
patent: 5150053 (1992-09-01), Pauly et al.
Pauly and Macovski, "Direct Design of Self-Refocusing RF Pulses," Society of Magnetic Resonance in Medicine, Tenth Annual Scientific Meeting, San Francisco, Calif. Aug. 10-16, 1991.

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