Phase encoding technique for more rapid magnetic resonance imagi

Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system

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324312, G01R 3320

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active

047484110

ABSTRACT:
Each view of a magnetic resonance image is phase encoded with one of a plurality of phase encode gradients which vary from each other by a multiple of a phase encode gradient interval or step. For a given field of view, the resolution is determined by the upper and lower limit phase encode gradient angles. The larger the limit angle, the finer the resolution. When the imaged subject is shorter in dimension along the phase encode axis than the dimension of the field of view of the image along the phase encode axis, a portion of dead space other than the subject is imaged. To shorten the imaging time, the number of views is reduced in accordance with the ratio of the object dimension to the field of view. The size of the phase encode gradient steps or intervals are increased by the same ratio such that a reduced number of views spans the same upper and lower phase encode gradient angle limits. This stretches the resultant image. When a generated image representation in an image memory is displayed, an inverse zoom reduces the dimension of the resultant display by the inverse of the ratio such that the man readable display is returned to the proper scale. Along a frequency encode axis which is transverse to the phase encode axis, a bandwidth of frequencies corresponding to extremes of a projection of the subject are determined. Received resonance signals are filtered to remove frequency components which are outside of the determined bandwidth.

REFERENCES:
patent: 4472683 (1984-09-01), Sekihara et al.
patent: 4593247 (1986-06-01), Glover
patent: 4644280 (1987-02-01), Paltiel
patent: 4684893 (1987-08-01), Kojima et al.
Book of Abstracts, SMRM 1985, p. 1030, "Strip-Scan: A Method for Faster NMR Imaging".

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