Method and means for magnetic resonance spin-echo imaging using

Details Method and means for magnetic resonance spin-echo imaging using Method and means for magnetic resonance spin-echo imaging using

1988-06-10

1989-09-19

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3320

Patent

active

048685011

ABSTRACT:
An adiabatic pulse suitable for generating selective spin echoes for both MR imaging and spectroscopy is described. The pulse requires no gradient reversal to achieve phase compensation. Like adiabatic inversion pulses the new pulse performs a .pi. rotation for any amplitude exceeding a threshold. Unlike inversion pulses, this pulse leaves no phase variation across the slice. The pulse is actually a composite consisting of a 2.pi. and a .pi. pulse. The 2.pi. pulse merely compensates for the phase of the .pi. phase; it performs no net rotation. This compensation is immune to RF inhomogeneity and nonlinearity.

REFERENCES:
patent: 4442404 (1984-04-01), Bergmann
patent: 4486709 (1984-12-01), Bendall
patent: 4528509 (1985-07-01), Radda et al.
patent: 4581581 (1986-04-01), Pelc
patent: 4661775 (1987-04-01), Kormos et al.
patent: 4727324 (1988-02-01), Bendall et al.

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