Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-06-08
1988-10-11
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324322, G01R 3320
Patent
active
047774401
ABSTRACT:
In a magnetic resonance imaging apparatus an RF rotating field is generated by applying RF energy to two mutually perpendicular coil systems, a 1/4.lambda. lead being provided between the connection points of the systems. In that case the drive points and the detection signal output points are not the same, so that in the case of a change-over from transmission to reception, the connection between the transmitter and the receiver must be switched over. In the magnetic resonance imaging apparatus in accordance with the invention, a phase difference of 180.degree. is created between two junctions by means of 1/4.lambda. leads so that an intermediate junction will actually not carry a voltage. This point (for transmission and reception, two different points) is connected to ground by means of a PIN diode. A simplification enables connection of the transmitter as well as the receiver to the transmitter/receiver coil system via a single coaxial cable.
REFERENCES:
patent: 4333053 (1982-06-01), Harrison et al.
patent: 4361807 (1982-11-01), Barl et al.
Streeter William J.
Tamoshunas Algy
Tokar Michael J.
U.S. Philips Corporation
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