Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1981-06-09
1984-01-10
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324309, 324321, G01R 3308
Patent
active
044255470
ABSTRACT:
A nuclear magnetic resonance apparatus in which information of a nuclear magnetic resonance distribution of a specified atomic nucleus in multiple directions in a body to be examined is obtained by magnet devices for making a homogeneous static magnetic field overlap a gradient magnetic field and for electrically rotating the isomagnetic field surface of the gradient magnetic field with respect to a coil wound around the body for impressing electromagnetic waves on the body, a receiver for detecting nuclear resonance as a result of impressing the magnetic fields and electromagnetic waves upon the body, a coil holder made of a material containing none of the specified atomic nucleus both for holding the coil in a predetermined shape and for suitably spacing the coil from the body, a pair of standard signal sources made of a material containing the specified atomic nucleus and disposed in the coil holder to face each other through a body positioned in the coil for compensating a projection signal, and a drive device for rotating the coil holder with its signal sources and the coil as a unit in synchronism and cooperation with the electric rotations of the gradient magnetic field, the paired standard signal sources always being positioned in the isomagnetic field surfaces on both sides of the body whereby an image of the concentration distribution of the specified atomic nucleus in a specified plane of the body is obtained.
REFERENCES:
patent: 3789832 (1974-02-01), Damadian
patent: 4254373 (1981-03-01), Lippmaa
patent: 4333053 (1982-06-01), Harrison
patent: 4354499 (1982-10-01), Damadian
patent: 4374360 (1983-02-01), Sepponen
P. C. Lautebar, "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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