Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-04-01
1988-08-09
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324318, 324322, G01R 3320
Patent
active
047630744
ABSTRACT:
An automatic tuning circuit for a quadrature coil antenna system of a magnetic resonance imaging system is provided which includes a test coil for applying a test signal to each of a first and a second channel of the antenna to produce a first channel signal on the first channel and a second channel signal on the second channel. A phase meter assembly is coupled to the first and second antenna channels for measuring the phase of the second channel signal relative to the phase of the first channel signal to obtain an error signal. An auto-tune assembly is coupled to the phase meter assembly and to the second antenna channel for adjusting the phase of the second channel signal in response to the error signal to obtain a desired phase relationship between the first and second channel signals. The invention also includes a method for automatically tuning a quadrature coil antenna system of a magnetic resonance imaging system which includes a first step of applying a test signal having a selected magnetic field polarization vector to the first and second antenna channels to produce the first channel signal on the first antenna channel and the second channel signal on the second antenna channel, a second step of measuring the phase of the second channel signal relative to the phase of the first channel signal and producing the error signal corresponding to the difference of the first channel signal phase and the second channel signal phase, and a third step of adjusting the resonant frequency of the second antenna channel in response to the error signal.
REFERENCES:
patent: 3999118 (1976-12-01), Hoult
patent: 4695801 (1987-09-01), Arakawa et al.
patent: 4707664 (1987-11-01), Fehn et al.
"QD Fourier NMR Detection: . . . " A. G. Redfield et al., Journal of Magnetic Resonance 19, No. 2, Aug. (1975), pp. 250-254.
Arana Louis M.
Kabushiki Kaisha Toshiba
Levy Stewart J.
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