Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1991-12-05
1993-11-09
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
G01B 3320
Patent
active
052606589
ABSTRACT:
A circuit for detuning a resonator in a nuclear magnetic resonance imaging apparatus has an output connected to a terminal of the resonator via a high-frequency line composed of two conductors. The resonator is shortened at this terminal with a shorting capacitor that can be short-circuited for detuning the resonator. The length of the high-frequency line is shorter than one-fourth of the wavelength of a high-frequency signal having the operating frequency of the nuclear magnetic resonance imaging apparatus on the high-frequency line. For detuning the resonator the high-frequency line can be terminated at the output with a further capacitor, so that the high-frequency line acts as a short-circuit at the terminal.
REFERENCES:
patent: 4801885 (1989-01-01), Meissner et al.
"Human in Vivo Phosphate Metabolite Imaging with .sup.31 P NMR" Bottomley et al., Magnetic Resonance in Medicine 7 (1988) pp. 319-336.
"Taschenbuch der Hochfrequenztechnik," Meinke et al. (1956) pp. 185-187.
Patent Abstracts of Japan, P-453 vol. 10, No. 119, May 6, 1986, Application No. 59-103380.
Greim Helmut
Oppelt Ralph
Ruhl Juergen
Siemens Aktiengesellschaft
Tokar Michael J.
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