Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1986-08-28
1987-11-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324312, G01R 3320
Patent
active
047060271
ABSTRACT:
A two dimensional Fourier transform magnetic resonance imaging method produces a series of scan lines in Fourier space using quadrature demodulation of a series of radio frequency echo signals from an object being observed with a reference signal. Fourier transforming the scan line data provides visual image data through a section of the object. Limitations in the hardware performance introduces unknown, time varying, phase errors into the scan line data, proportional to the phase difference between the reference signal and the echo signals as each is demodulated. Improved visual imaging results from the introduction of an additional sensitive line scan through Y=0 in Fourier space, having a calculable phase error which is used to correct the unknown phase errors in the remaining scan lines. The phase term of the sensitive line data is corrected for the phase error which is known at Y=0. Magnetic resonance imaging scan line data are next generated for a slice through the object. Because the phase of the sum of the data for each scan line must be the same as that of the sensitive line data for corresponding values of Y, the scan line phase error may be calculated and removed from the phase of each scan line.
REFERENCES:
patent: 4625170 (1986-11-01), Yamamoto
patent: 4649346 (1987-03-01), Yeung et al.
"NMR Fourier Zeugmatography", Kumar et al., Journal of Magnetic Resonance, vol. 18, pp. 69-83, (1975).
Kabushiki Kaisha Toshiba
Tokar Michael J.
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