Magnetic resonance imaging method and apparatus employing a stat

Details Magnetic resonance imaging method and apparatus employing a stat Magnetic resonance imaging method and apparatus employing a stat

1996-03-19

1998-04-14

O'Shea, Sandra L.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01R 3334, G01N 2408

Patent

active

057396884

ABSTRACT:
In a magnetic resonance tomography pulse sequence, a slice perpendicular to the spatial direction of an inhomogeneity in the static field is first excited. The nuclear spins are re-phased and spin echo signals are readout under a gradient in a second direction. A phase-encoding gradient is activated between the excitation and the readout of the nuclear spins. A predetermined inhomogeneity in the static magnetic field is permanently present and acts during the overall pulse sequence as a permanent magnetic field gradient. With this pulse sequence, an inhomogeneity in two spatial directions can be allowed, which simplifies the construction of a magnet considerably and improves the access to the subject under examination.

REFERENCES:
patent: 5126674 (1992-06-01), Miller et al.
patent: 5200701 (1993-04-01), Siebold et al.
patent: 5235279 (1993-08-01), Kaufman et al.
"SPI--Single Point FID Imaging MRI With Echo Times<50.mu.s," Nauerth et al., SMRM Abstracts 1193, p. 1215; 1993.

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