Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1988-08-09
1989-12-26
Chapman, John
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, 334 55, G01R 3320
Patent
active
048900630
ABSTRACT:
A probe coil system for a magnetic resonance (MR) apparatus includes a plurality of coil elements, a plurality of shortening capacitor elements, and first and second capacitors. The plurality of shortening capacitor elements are inserted between and in series with the coil elements. The first capacitor is connected in parallel with the coil elements and the shortening capacitor elements. The second capacitors are connected at least in series with the coil elements and the shortening capacitor elements. Each of the shortening capacitor elements includes a plurality of capacitors and a plurality of switches, selectively opened and closed to switch a total capacitance of the plurality of capacitors, allowing selection of one of a plurality of resonance frequencies by adjusting the first and second capacitors within a predetermined range.
REFERENCES:
patent: 4602213 (1986-07-01), Sugiura
patent: 4620155 (1986-10-01), Edelstein
patent: 4633181 (1986-12-01), Murphy-Boesch et al.
patent: 4694255 (1987-09-01), Hayes
patent: 4788503 (1988-11-01), Van Heelsbergen
Chen, et al., "A Study of R.F. Power Deposition in Imaging", Book of Abstracts, vol. 2, Society of Magnetic Resonance in Medicine (Fourth Annual Meeting, Aug. 1985), London, U.K., pp. 918-919.
Shen, et al., "R.F. Coil Design for NMR Imaging", Book of Abstracts, vol. 2, Society of Magnetic Resonance in Medicine (Fourth Annual Meeting, Aug. 1985), London, U.K., pp. 1117-1118.
Chapman John
Kabushiki Kaisha Toshiba
O'Shea Kevin D.
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