Time varying read and phase gradients where the duration of thei

Details Time varying read and phase gradients where the duration of thei Time varying read and phase gradients where the duration of thei

1997-04-07

1999-09-14

Barlow, John

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324307, G01V 300

Patent

active

059528273

ABSTRACT:
An MRI method and system in which phase gradients and read gradients overlap over varying time durations. The MRI signals sampled while there is no overlap fill a non-rectangular matrix in K-space. Alternately, the MRI signal is sampled during the times of overlap as well but a zero is placed at the corners of the matrix at locations which correspond to overlap. The benefit include a reduction in the MRI data acquisition time for the same spatial resolution as known sequences, an increase in image spatial resolution for the same MRI data acquisition time as known sequences, lower signal bandwidth and increase the image signal-to-noise ratio (SNR). In addition, in a gradient echo MRI sequence, the read and write gradients do not overlap in time but vary in width (or at least one of the them varies in width) with time to achieve similar advantages.

REFERENCES:
patent: 4940940 (1990-07-01), Rzedzian
patent: 5245282 (1993-09-01), Mugler, III et al.
patent: 5361028 (1994-11-01), Kanayama et al.
patent: 5621321 (1997-04-01), Liu et al.

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