Electricity: measuring and testing – Particle precession resonance – Using a nuclear resonance spectrometer system
Patent
1985-01-04
1987-07-14
Levy, Stewart J.
Electricity: measuring and testing
Particle precession resonance
Using a nuclear resonance spectrometer system
324300, G01R 3320
Patent
active
046805451
ABSTRACT:
A method is provided for reducing acoustical noise generated when gradient coils which are part of a nuclear magnetic resonance (MR) scanner are energized by current pulses in the course of an MR study. The acoustical noise is due to vibrations of a fiber-glass coil form on which the coils are wound. The vibrations are excited by high frequency components in the squared-edged conventional current pulses. Significant noise reduction is achieved by shaping the leading and trailing current pulse edges to eliminate the objectionable high frequency components. Advantageously, the pulse edges can be shaped using sinusoidal and Bessel function waveforms. Another useful waveform for pulse shaping is a ramp function with rounded transition points.
REFERENCES:
patent: 3303356 (1967-02-01), Bell
patent: 4029972 (1977-06-01), Fox et al.
patent: 4339724 (1982-07-01), Feher
patent: 4384255 (1983-05-01), Young et al.
patent: 4438400 (1984-03-01), Patt
patent: 4509011 (1985-04-01), Sugimoto et al.
Bradshaw Kenneth M.
Gray Floyd L.
Kolawole Joshua O.
Schubert Thomas F.
General Electric Company
Levy Stewart J.
O'Shea Kevin D.
Stoner Douglas E.
LandOfFree
Method for reduction of acoustical noise generated by magnetic f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for reduction of acoustical noise generated by magnetic f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for reduction of acoustical noise generated by magnetic f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1429928