Nuclear magnetic resonance tomography apparatus having a resonan

Details Nuclear magnetic resonance tomography apparatus having a resonan Nuclear magnetic resonance tomography apparatus having a resonan

1992-08-05

1993-09-14

Arana, Louis

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01V 300

Patent

active

052452875

ABSTRACT:
A nuclear magnetic resonance tomography apparatus has at least one gradient coil interconnected with a capacitor to form a resonant circuit. Before the beginning of each read-out sequence, the capacitor is charged to a higher voltage than would be necessary to produce a pure sine oscillation during the read-out sequence. The rise time of the gradient pulse thus produced is less than one-fourth of the duration of the sinusoidal oscillation before the zero-axis crossing, and the decay time is less than one-fourth of the duration of the sinusoidal oscillation after the zero-axis crossing. Additionally, a constant part of each gradient pulse is non-resonantly generated by a gradient amplifier. Only the steep parts of the oscillation of the resonant circuit are used for the rising and trailing edges, whereas the flattened part of the sine oscillation is cut off. The rising and trailing edges can thus be noticeably shortened, so that a greater range for the constant gradient value, which can be equidistantly sampled in the k-space is available for the signal evaluation.

REFERENCES:
patent: 4668904 (1987-05-01), Kupiainen
patent: 4733342 (1988-03-01), Mueller et al.
patent: 4961054 (1990-10-01), Park et al.
patent: 5017871 (1991-05-01), Mueller et al.
patent: 5063349 (1991-11-01), Roemer et al.

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