G - Physics – 01 – R
Patent
G - Physics
01
R
G01R 33/48 (2006.01) G01F 1/716 (2006.01) G01N 24/08 (2006.01) G01R 33/385 (2006.01) G01R 33/56 (2006.01) G01R 33/34 (2006.01)
Patent
CA 2124634
A magnetic resonance imaging apparatus includes a magnet system for producing a homogeneous magnetic field along the z axis. A plurality of wire conductors are arranged in a "bird cage" or "squirrel cage" configuration and are supplied with a circularly rotating RF field centered near the Larmor frequency .omega.o. The wire conductors also receive a voltage source V p having a frequency .omega.p, which is less than the Larmor frequency. The voltage source V p is rotated about the wire conductors at a frequency of .omega.~, which is much less than the frequency .omega.p, to successively apply the voltage V p to each pair of diametrically opposed wire conductors in a manner which is ordered as a spatial cylindrical harmonic rotating at a frequency w~. The voltage source V p produces electric fields in the object which, in turn, generate linear magnetic field gradients in the object. The voltage source V p phase encodes the signals detected from the object which thereby enables a transverse magnetization at each point within the object to be rapidly mapped back. With the invention, an image of the object is rapidly and continuously produced without requiring the use of the conventional gradient field coils and without any mechanical moving parts.
Bereskin & Parr
Wollin Ernest
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