Magnetic resonance methods and apparatus

Details Magnetic resonance methods and apparatus Magnetic resonance methods and apparatus

1989-08-11

1990-11-06

Tokar, Michael J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324322, G01R 3320

Patent

active

049689371

ABSTRACT:
An r.f. antenna for use in a magnetic resonance method or apparatus comprising two sub-systems (17A, 17B) each comprising a relatively large area conductor means (29A, 29B) and a return current path conductor means (33A, 33B) which together act as a transmission line tuned to the frequency of the r.f. The two sub-systems are placed on opposite sides of a body (7) under examination with the large area conductor means in facing relationship, and when used to apply an r.f. field to the body, are excited so that the r.f. currents in the two large area conductor means at any given instant are in opposite directions. The large area conductor means of each sub-system may be planar or convexly or concavely curved, and may comprise a single sheet of conducting material or an array of conducting strips in spaced relationship. The return path conductor means of each sub-system is suitably in the form of one or two strips or wires positioned behind the associated large area conductor means with respect to the other sub-system. Alternatively each return path conductor means may be surrounded by an electrical screen and positioned wherever is convenient.

REFERENCES:
patent: 4165479 (1979-08-01), Mansfield
patent: 4506224 (1985-03-01), Krause
patent: 4595899 (1986-06-01), Smith et al.
patent: 4617516 (1986-10-01), Schenck
patent: 4680550 (1987-07-01), Krause
patent: 4751464 (1988-06-01), Bridges
patent: 4752738 (1988-06-01), Patrick et al.
European Search Report Application No. EP 89 30 7485.

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