Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1995-08-08
1997-02-11
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324322, 1286535, G01R 3320
Patent
active
056024797
ABSTRACT:
In a magnetic resonance imaging apparatus, a radio frequency coil (40) is disposed closely adjacent the patient's head. The radio frequency coil includes a first annular ring (80, 114) around the patient's head from which a first plurality of legs (82, 116) extend. Opposite legs are interconnected equidistant from the first annular ring to form a virtual ground connection (84, 118). In the embodiment of FIG. 6, a second annular ring (120) is disposed parallel to the first annular ring with a second plurality of legs (122) extending between the first and second annular rings. By adjusting a ratio .rho. of the current flow in the loops defined by the first legs, the first annular ring and virtual ground relative to the current loops defined by the second legs and the first and second annular rings, the linearity of the B.sub.1 field within the head coil is selectively adjustable (FIG. 8).
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Elek Robert A.
Liu Haiying
Srinivasan Ravi
Mah Raymond Y.
O'Shea Sandra L.
Picker International Inc.
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