Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1988-01-19
1989-11-14
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01R 3320
Patent
active
048810347
ABSTRACT:
An array of plural magnetic resonance imaging (MRI) RF coils is provided having different and overlapping fields of view. Controllable switches are connected with each individual coil of the array and are capable of selectively conditioning any one of the coils for individual usage in an MRI procedure. Either mechanical or electrical (e.g., PIN diode) switching control may be utilized. Preferably, controllable electrical switches are located at points having approximately zero RF potential. Distributed capacitance is also preferably employed for reducing terminal inductance, preventing the establishment of spurious magnetic fields and facilitating the use of electrical switching diodes and/or varactor capacitance elements. Such distributed capacitances are also dimensioned so as to cause the terminal inductance of each coil to be within the tuning/matching range of a common tuning/matching RF circuit.
REFERENCES:
patent: 4620155 (1986-10-01), Edelstein
patent: 4636730 (1987-01-01), Bottomley
patent: 4682107 (1987-07-01), Bendall et al.
patent: 4703274 (1987-10-01), Kaufman et al.
patent: 4728896 (1988-03-01), Bendall et al.
Book of Abstracts, vol. 2, "Society of Magnetic Resonance in Medicine"-Sixth Annual Meeting and Exhibition-Aug. 17-21, 1987, New York City, U.S.A. pp. 4,96,405,408,823,849.
Arakawa Mitsuaki
Fehn John H.
Kaufman Leon
Krasnor Stephen
McCarten Barry M.
Fess Lawrence G.
The Regents of the University of California
Tokar Michael J.
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