Nuclear magnetic resonance apparatus using low energy magnetic e

Details Nuclear magnetic resonance apparatus using low energy magnetic e Nuclear magnetic resonance apparatus using low energy magnetic e

1985-08-15

1987-11-17

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

335304, 335306, 324318, G01R 3320, H01F 700

Patent

active

047076631

ABSTRACT:
An NMR scanner apparatus uses a permanent magnet comprised of an assembly of magnetic material formed of a substantial number of low energy permanent magnetic elements producing magnetic flux and arranged in at least one row of columns. A frame of magnetically soft material provides a return path for the magnetic flux and provides a surface from which the columns of magnetic elements extend. A flux concentrator plate is disposed adjacent to a surface of the assembly and recessed a sufficient distance from the edge of the assembly to inhibit the loss of magnetic flux. The flux concentrator plate and the frame sandwich the magnetic assembly therebetween. A pole piece consisting of a soft magnetic material is disposed adjacent to a surface of the flux concentrator plate. The pole piece defines a scanning area substantially smaller than the area of the adjacent surface of the flux concentrator plate such that the pole piece exhibits parallel lines of magnetic flux for inducing polarization in living tissue.

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patent: 4048555 (1977-09-01), Rupp, Jr. et al.
patent: 4093912 (1978-06-01), Double et al.
patent: 4580098 (1986-04-01), Gluckstern et al.
patent: 4644313 (1987-02-01), Miyajima

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