Technique for reducing aliasing artifacts wtih insertable gradie

Details Technique for reducing aliasing artifacts wtih insertable gradie Technique for reducing aliasing artifacts wtih insertable gradie

1993-09-02

1995-09-19

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3328

Patent

active

054518750

ABSTRACT:
A magnet assembly (10) generates a temporally constant magnetic field through a central bore (12). A whole body gradient coil assembly (30) and a whole body radio frequency coil (36) are mounted in the central bore. A insertable gradient coil assembly (40), such as a head gradient coil, is selectively insertable into and removable from the bore (12). The insertable gradient coil assembly generates linear magnetic field gradients (90) within its bore for encoding magnetic resonance excited and manipulated by radio frequency signals from the whole body radio frequency coil. In regions (96) outside of the insertable gradient coil, the insertable gradient coil produces magnetic field gradients of the same strength as magnetic field gradients generated within its bore. Resonating dipoles within regions (96) contribute encoded magnetic resonance signals which are indistinguishable from the encoded magnetic resonance signals generated from within the insertable gradient coil bore. The whole body gradient coil assembly (30) generates magnetic field gradient pulses concurrently with RF pulses from the whole body gradient coil (36) to saturate material in the aliasing regions ( 96) or selected aliasing region portions (100) within which there are dipoles that contribute aliasing resonance signal components.

REFERENCES:
patent: 4961054 (1990-10-01), Park et al.
patent: 5235279 (1993-08-01), Kaufman et al.
patent: 5278504 (1994-01-01), Patrick et al.
patent: 5280248 (1994-01-01), Zoa et al.
patent: 5394086 (1995-02-01), Patrick et al.

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