Orthogonal adjustment of magnetic resonance surface coils

Details Orthogonal adjustment of magnetic resonance surface coils Orthogonal adjustment of magnetic resonance surface coils

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

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