Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1981-05-19
1983-12-20
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, 324319, G01R 3308
Patent
active
044220421
ABSTRACT:
A nuclear magnetic resonance apparatus including magnet apparatus for generating a homogeneous static magnetic field between its magnetic poles, shims of a magnetic substance mounted on the magnetic poles to apply a first gradient magnetic field intensity distribution in a direction orthogonal as to the direction of line of magnetic force of the static magnetic field, gradient magnetic field generating electromagnetic apparatus for generating a second gradient magnetic field having a gradient magnetic field intensity distribution in superimposition with the static magnetic field and for changing the magnetic field gradient of the first gradient magnetic field, an oscillator for generating an oscillating output having a frequency corresponding to the nuclear magnetic resonance condition of an atomic nucleus to be measured, a coil wound around a body to be examined for applying the output of said oscillator as electromagnetic waves upon the body, a receiver for detecting the nuclear magnetic resonance signals received by the coil, a gradient magnetic field controller making a magnetic field line equivalent to the combined gradient magnetic fields and for rotating the line along the section of the body to be examined by controlling said gradient magnetic field generating electromagnetic apparatus and devices for recording the nuclear magnetic resonance signals, for reconstructing the concentration distribution of the specific atomic nuclei in the section of the body, and a display unit for depicting the result of reconstruction.
REFERENCES:
patent: 3418538 (1968-12-01), Roman
patent: 3714553 (1973-01-01), Keller
patent: 3789832 (1974-02-01), Damadian
patent: 4284950 (1981-08-01), Burl et al.
patent: 4333053 (1982-06-01), Harrison
patent: 4354499 (1982-10-01), Damadian
P. C. Lauterbar, "Image Formation by Induced Local Interactions: Examples Employing Nuclear Magnetic Resonance" Nature vol. 242, Mar. 16, 1974, pp. 190-191.
Crooks et al., "Tomographic Imaging with Nuclear Magnetic Resonance", Investigative Radiology, Jan.-Feb. 1978, pp. 63-66.
Tokar Michael J.
Tokyo Shibaura Denki Kabushiki Kaisha
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