Quadrature surface coil construction for magnetic resonance imag

Details Quadrature surface coil construction for magnetic resonance imag Quadrature surface coil construction for magnetic resonance imag

1990-02-20

1991-07-09

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

G01R 3320

Patent

active

050309153

ABSTRACT:
A magnetic resonance imaging detection coil includes an outer coil divided into two symmetrical coils by a transverse central conductor. A 180.degree. phase shift network is coupled across the junction of the central transverse conductor with the outer conductor for providing the central conductor with a virtual ground potential when a magnetic field normal to the general plane of the coil system is present. The two coils formed by the central conductor and the outer conductor form parallel coils functioning similarly as a butterfly coil. The currents in the central conductor are cumulative, flowing in the same direction. The parallel coil system induces current on the central conductor which is 90.degree. out of phase with the current induced in the outer conductor. The signals corresponding to the parallel coil and series coil arrangement are then phase shift combined to place these signals in phase.

REFERENCES:
patent: 4734648 (1988-03-01), Machida et al.
patent: 4766383 (1988-08-01), Fox et al.
patent: 4928064 (1990-05-01), Keren

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