Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1981-05-20
1984-01-31
Tokar, Michael J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324319, G01R 3308
Patent
active
044292775
ABSTRACT:
A nuclear magnetic resonance apparatus for registering the nuclear magnetic resonance condition of atomic nuclei distributed in a body including first magnetic field generating means for generating a homogeneous static magnetic field having a thin beam shape for application to a selected portion of the body, second magnetic field generating means for simultaneously generating a gradient magnetic field of smaller intensity than that of the beam-shaped static magnetic field and of such distribution as to gradually increase or decrease in the direction of the beam-shaped static magnetic field, an oscillator for generating electromagnetic waves having a frequency corresponding to the nuclear magnetic resonance condition of the specific atomic nuclei to be measured, a coil wound around the body to be examined, at least a portion of said coil lying in said magnetic fields, impressing the electromagnetic waves upon the body and for detecting the nuclear magnetic resonance in the body, drive means for moving the body in a direction perpendicular to the beam-shaped magnetic field, a receiver for receiving and processing the nuclear magnetic resonance signal detected by the coil, a recorder for recording the nuclear magnetic resonance signal processed by the receiver in synchronism with the operation of the drive means for identifying the recorded resonance signal with the position of the body, and a display unit for reading the records as to a desired region of the body out of said recorder and for selectively or simultaneously displaying the distribution and relaxation time of the relevant atomic nuclei in the body.
REFERENCES:
patent: 3234435 (1966-02-01), Hempstead
patent: 3418538 (1968-12-01), Roman
patent: 3789832 (1974-02-01), Damadian
patent: 3932805 (1976-01-01), Abe
patent: 4015196 (1977-03-01), Moore
patent: 4374360 (1983-02-01), Sepponen
P. C. Lautebar, "Image Formation by Induced Local Interactions: Examples Employing Nuclear Magnetic Resonance", Nature, vol. 242, 3/16/84-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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