Slice profile optimization for a nuclear magnetic resonance tomo

Details Slice profile optimization for a nuclear magnetic resonance tomo Slice profile optimization for a nuclear magnetic resonance tomo

1990-06-25

1991-12-03

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

050702998

ABSTRACT:
In a nuclear magnetic resonance tomography apparatus, for slice profile optimization, a pre-saturation RF pulse is generated in the presence of a slice selection gradient before the excitation RF pulse in a gradient echo sequence. The frequency spectrum of the pre-saturation RF pulse is defined so that it excites regions of the slice which correspond to the edges of the excitation RF pulse. A spoiler gradient in the z-direction is generated between the pre-saturation RF pulse and the excitation RF pulse. As a result of the pre-saturation RF pulse, the dependency of the slice profile on the flip angle of the excitation RF pulse and on the relationship T.sub.R /T.sub.1 is reduced.

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