Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1987-05-22
1989-02-21
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324309, G01R 3320
Patent
active
048068675
ABSTRACT:
The magnetic resonance imaging system applies a uniform static magnetic field and a gradient magnetic field to an object and further applies an excitation rotating magnetic field to cause magnetic resonance phenomena in the object to detect the induced magnetic resonance signals and then to obtain image data by processing the magnetic resonance signals. The system has a power controller for controlling the transmission power in a transmitter for transmitting the excitation rotating field. The system further has a transmission controller for controlling the power controller in response to the magnetic resonance signal which is received by the receiver from the object. The transmission controller controls the power controller to sequentially change the transmission power and detects the transmission power at which the maximum magnetic resonance signal is obtained in response to the reception signal by the receiver when the excitation rotating field is applied to the object, thereby controlling the power controller in accordance with the detected data. A fraction of the detected maximum power is utilized to generate the excitation field to thereby rotate the spin angle of the nuclei by an amount less than 90.degree., and preferably 45.degree., so as to reduce data collection time.
REFERENCES:
patent: 3039048 (1962-06-01), Shoolery
patent: 3112441 (1983-11-01), Robinson
patent: 3725776 (1973-04-01), Petrinovic
patent: 3921060 (1975-11-01), Ekimovskikh et al.
patent: 4297637 (1981-10-01), Crook et al.
patent: 4329646 (1982-05-01), Tsuda
patent: 4443760 (1984-04-01), Edelstein et al.
patent: 4532474 (1985-07-01), Edelstein
patent: 4558277 (1985-12-01), Post et al.
patent: 4625171 (1986-11-01), Sekihara et al.
patent: 4740750 (1988-04-01), Machida
Fukushima et al., Experimental Pulse NMR a Nuts and Bolts Approach, Addison-Wesley Pub., 1981.
Signa System Operation Manual, vol. 3, Patient Preparation and The MR Exam, 10,26/84.
Hanawa Masatoshi
Hayakawa Hiroshi
Kabushiki Kaisha Toshiba
Levy Stewart J.
O'Shea Kevin D.
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