Magnetic resonance imaging apparatus including two orthogonal r.

Details Magnetic resonance imaging apparatus including two orthogonal r. Magnetic resonance imaging apparatus including two orthogonal r.

1986-03-18

1987-12-08

Levy, Stewart J.

Electricity: measuring and testing

Particle precession resonance

Spectrometer components

324318, G01R 3320

Patent

active

047120690

ABSTRACT:
In an apparatus for performing magnetic resonance measurements by means of an orthogonal system of excitation detection coils there is provided a switching circuit for powering and reading the coil system which includes a 1/4 .lambda. coaxial conductor as a connection between the two coil assemblies and a 1/4 .lambda. coaxial conductor with a 90.degree. phase delay as a connection between the first 1/4 .lambda. conductor and the second coil assembly and a detection device. By suitable tuning of the relevant circuit components and the coils, preferably based on 50 Ohms, a simple switching circuit with appropriate matching and phase correction is thus achieved. Specifically, the r.f. power source can be connected to the circuit via an n .lambda. conductor. In the open condition during detection, the n .lambda. conductor represents an infinite impedance for the switching circuit.

REFERENCES:
Single Coil Probe with Transmission-line Tuning for NMR by V. R. Cross et al., Rev. Sci. Instrum., vol. 47, No. 12, Dec. 1976.

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