Imaging systems

Details Imaging systems Imaging systems

1979-06-15

1981-08-18

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324313, G01N 2700

Patent

active

042849500

ABSTRACT:
In a medical NMR apparatus it is desirable that the axial magnetic field, Ho, is uniform. The result can in theory be obtained by accuracy of construction but in practice this cannot readily be achieved. It is now proposed to use a field sensing probe system which indicates the value of that field at a plurality of positions in the examined region and provides error signals indicating deviations from uniformity. The field is automatically corrected in response to the error signals by applying currents to field correcting coils. The errors may be considered as distinct gradient and dishing errors which are corrected individually.

REFERENCES:
patent: 3443209 (1969-05-01), Nelson et al.
patent: 3622869 (1971-11-01), Golay

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