Imaging systems

Details Imaging systems Imaging systems

1979-05-16

1981-11-10

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

G01N 2700, G01N 2408

Patent

active

043000967

ABSTRACT:
Nuclear magnetic resonance (NMR) apparatuses have been proposed to examine slices or volumes of bodies, perhaps patients for medical purposes, by exciting resonance and detecting the resonance signals.
In an NMR apparatus an G.sub.R field gradient, for selecting lines within a slice or volume, is formed of Gx and Gy components. These should match exactly in shape if not in magnitude. In practice this is difficult to achieve and it is proposed to monitor these fields and derive error signals for their deviation from each other or from a standard. The error signals are used to reduce the deviations so that continuous adjustment of the fields is provided.

REFERENCES:
patent: 3778614 (1973-12-01), Hounsfield
patent: 3789832 (1974-02-01), Damadian
patent: 3924129 (1975-12-01), Gordon
patent: 3932805 (1976-01-01), Abe
patent: 4015196 (1977-03-01), Moore
patent: 4021726 (1977-05-01), Garroway
patent: 4070611 (1978-01-01), Ernst
Proton Spin Imaging by Nuclear Magnetic Resonance, Mansfield, Contemp. Phys., 1976, vol. 17, No. 6, pp. 553-576.
Design and Performance of YIG-Tuned Gunn Oscillators, Easson, The Microwave Journal, Feb. 1971, pp. 53-58 and 68.
Ka-Band YIG-Tuned GaAs Oscillator, Zublin et al, The Microwave Journal, Sep. 1975, pp. 33-35 and 50.

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