Nuclear magnetic resonance imaging apparatus

Details Nuclear magnetic resonance imaging apparatus Nuclear magnetic resonance imaging apparatus

1997-11-21

2000-08-29

Oda, Christine K.

Electricity: measuring and testing

Particle precession resonance

Using a nuclear resonance spectrometer system

324318, G01V 300

Patent

active

061114103

ABSTRACT:
A magnet having a yoke and a pair of poles coupled to the yoke in a spaced apart relationship includes a pair of energization coils in proximity to each of the poles for creating a magnetic field of a desired strength. A pair of prepolarization coils are also disposed in proximity to each of the poles to vary the strength of the magnetic field during a nuclear magnetic resonance prepolarization procedure. In order to minimize the amount of eddy currents introduced to the yoke during the prepolarization procedure the poles are comprised of magnetically effective and substantially non-electrically conductive material. Magnetically effective material includes material having a low hystresis. To further reduce the amount of eddy currents introduced to yoke, a flux is created having a sense substantially opposite of that produced by the energization coil. Such opposing flux may be produced by the prepolarization coils and/or by a shield winding placed in proximity of the poles for that purpose.

REFERENCES:
patent: 4906931 (1990-03-01), Sepponen
patent: 4985678 (1991-01-01), Gangarosa, et al.
patent: 5555251 (1996-09-01), Kinanen

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