Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-11-19
1996-05-28
O'Shea, Sandra L.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01V 300, G01V 314
Patent
active
055215068
ABSTRACT:
An NMR magnetic coil system (10) is disclosed wherein the isolation between the coils (16, 18) can be adjusted to decrease or virtually eliminate the coupling between quadrature magnetic resonance imaging coils (16, 18). At least one of the coils (16) is separated into parallel segments (20, 22), located in a critically overlapped area. The capacitance of the segments is adjusted by a differential capacitor (76) to vary the ratio of the RF current flowing through the parallel segments. Appropriate adjustment of the capacitance of these paths (20, 22) causes a sharing of the appropriate amount of the out of phase flux to cancel the balance of the shared flux and therefore results in a net mutual inductance of zero.
REFERENCES:
patent: 4694225 (1987-09-01), Hayes
patent: 4879516 (1989-11-01), Mehdizadeh
patent: 5097210 (1992-03-01), Requardt
patent: 5221902 (1993-06-01), Jones
patent: 5256971 (1993-10-01), Boskamp
patent: 5382903 (1995-01-01), Young
Misic George
Reid Eric
Haynes Mack
Medrad Inc.
O'Shea Sandra L.
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