Imaging systems

Details Imaging systems Imaging systems

1979-05-18

1981-08-18

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324313, G01N 2700

Patent

active

042849489

ABSTRACT:
In an imaging apparatus using nuclear magnetic resonance, first and second gradient field pulses are applied, the second being of opposite sense to the first. It is preferable to match these so that they entirely cancel. However it is shown to be sufficient if they are as close as possible to the same magnitude and a further `glitch` pulse is used to reduce the total gradient field over the pulse sequence substantially to zero.

REFERENCES:
patent: 3530371 (1970-09-01), Nelson et al.
patent: 3778614 (1973-12-01), Hounsfield
patent: 3924129 (1975-12-01), LeMay
patent: 4115730 (1978-09-01), Mansfield
Mansfield Contemp. Phys., 1976, vol. 17, No. 6, pp. 553-576, "Proton Spin Imaging by Nuclear Magnetic Resonance".
Easson--The Microwave Journal, Feb. 1971, pp. 53-54, 56, 58, and 68, "Design and Performance of Yig-tuned Gunn Oscillators".
Zublin et al.--The Microwave Journal, Sep. 1975, pp. 33-35 and 50, "Ka-band YIG-tuned GaAs Oscillator".

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