Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1992-08-20
1994-04-12
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, G01R 3320
Patent
active
053029011
ABSTRACT:
Magnetic resonance apparatus includes an RF receiver coil system (13, 15) for detecting magnetic resonance signals generated in an object. This RF receiver coil system has a first (35) and a second receiver coil (37) which could be coupled to one another by mutual inductance. In order to compensate for the mutual inductance there is provided a decoupling network. This network has a first (49) and a second terminal (51) which are connected to a first end and a second end, respectively, of the first receiver coil (35), and also a third (53) and a fourth terminal (55) which are connected to a first end and a second end, respectively, of the second receiver coil (37). The decoupling network contains a first circuit (57) of variable impedance which interconnects the first and the third terminal (49, 53) and also a second circuit (59) of variable impedance which interconnects the second and the fourth terminal (51, 55). Each of the first and second circuits (57, 59) have at least one capacitor ( 63) and at least one coil (61), the value of the capacitor and/or the coil being variable so as to enable variation of the impedance of the circuits.
REFERENCES:
patent: 4620155 (1986-10-01), Edelstein
patent: 4769605 (1988-09-01), Fox
patent: 4812764 (1989-03-01), Bendall
patent: 4816765 (1989-03-01), Boskamp
patent: 4952879 (1990-08-01), Van Vaals et al.
patent: 4998066 (1991-03-01), Wiechern et al.
Arana Louis
Slobod Jack D.
U.S. Philips Corporation
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