Magnetic resonance methods and apparatus

Details Magnetic resonance methods and apparatus Magnetic resonance methods and apparatus

1990-01-29

1991-07-23

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01R 3320

Patent

active

050346911

ABSTRACT:
A magnetic resonance method comprising the steps of exciting magnetic resonance in nuclei in a planar region of a body, applying a first gradient magnetic field having a periodically reversing gradient in a first direction across the region in conjunction with a series of pulses of a second gradient magnetic field in a second direction across the region orthogonal to the first direction, progressively decreasing the time between successive pulses of the second gradient, sensing resonance signals from the nuclei, and subjecting the resonance signals to a two-dimensional Fourier Transform process to acquire data relating to the region of the body. In the method the time between successive pulses of the second gradient is decreased in such a manner as to avoid acquisition of data in respect of areas in the corners of a rectangular matrix defined by the first and second gradient fields. Also, in the method the time between successive reversals of the gradient of the first gradient field is caused to vary in corresponding manner to the time between successive pulses of the second gradient field.

REFERENCES:
patent: 4355282 (1982-10-01), Young et al.
patent: 4678996 (1987-07-01), Haacke et al.
patent: 4901020 (1990-02-01), Ladebeck et al.
Ljunggren, "A Simple Graphical Representation of Fourier-Based Imaging Methods", J. of Magnetic Resonance, 54, 338-343, 1983.

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