Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1993-10-08
1996-08-13
Arana, Louis M.
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324318, 1286535, G01V 300
Patent
active
055460011
ABSTRACT:
There provided is a switching signal generator mounted in a system for handling a signal of a predetermined frequency band. A magnetic resonance imaging (MRI) system is one of the preferred systems. The generator comprises an element for supplying a switching signal of a switching frequency to a switching device mounted in the system and operated by pulse width modulation, the switching frequency being able to be changed in response to a control signal. The generator further comprises an element for adjusting the switching frequency by supplying the control signal to the switching signal supplying element so that a frequency which is product of the switching frequency and an integer falls out of the predetermined frequency band. In case of the MRI system, the predetermined frequency band is an image frequency band. As a result, the so-called F1 noise can be avoidable from the image.
REFERENCES:
patent: 4733342 (1988-03-01), Mueller et al.
patent: 5227728 (1993-07-01), Kaufman et al.
patent: 5270657 (1993-12-01), Wirth et al.
patent: 5347222 (1994-09-01), Fox et al.
Arana Louis M.
Kabushiki Kaisha Toshiba
Yin Ronald L.
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