Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1988-12-14
1990-10-23
Williams, Hezron E.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
G01R 3320
Patent
active
049655205
ABSTRACT:
In an NMR imaging method, the phase encode amount applied to the respective echo signals in the same sequence of operation are made to have different values and the phase encoding magnetic fields Gen are made to disorder the phases of the NMR signals so as not to generate stimulated echo signals. In another aspect, the time periods of application of the signal reading magnetic field Gp applied between the 90.degree. RF pulse and the 180.degree. RF pulse are made to have different values equal in number to the chemical shifts. By varying the time period of application of the signal reading magnetic field, spin echo signals having different phase variance amounts due to the different chemical shifts are generated before or after the time point at which the spin echo due to the RF pulse is expected to occur. Accordingly, control difficulties for synchronizing the RF pulse and the slicing magnetic field and shifting them by the same time length is avoided wherein two chemical shifts can be separated.
REFERENCES:
patent: 4697148 (1987-09-01), Strobel et al.
patent: 4792758 (1988-12-01), Sattin
patent: 4803431 (1989-02-01), Sano et al.
patent: 4847560 (1989-07-01), Sattin
"Simple Proton Spectroscopic Imaging" by W. Thomas Dixon, Ph.D., Mallinckrodt Institute of Radiology, presented at the Sixty-Ninth Scientific Assembly and Annual Meeting of the Radiological Society of North America, Chicago, Ill., Nov. 13-18, 1983, pp. 189-194.
Arana Louis M.
Mitsubishi Denki & Kabushiki Kaisha
Williams Hezron E.
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