Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Patent
1998-11-24
2000-11-14
Arana, Louis
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
324319, G01V 300
Patent
active
061474940
ABSTRACT:
The gradient coil system in a conventional MRI apparatus is optimized in respect of the shielding effect by the shielding coil of the system. Consequently, the system generally is not optimized in respect of the Lorentz forces occurring in the system, resulting in noise of a level such that it is annoying to the users. In order to avoid such noise, the system can be force-optimized. Because the shielding effect is partly lost in that case, however, eddy currents and hence disturbing noise would occur again. However, if the eddy currents are made to occur in acoustically insulated eddy current conductors which also have a large time constant for the decay of the eddy currents, the adverse effects of these eddy currents are adequately counteracted and the disturbing noise is reduced to an adequate extent. Particularly, the (cold) radiation shields of a cryogenic magnet system, arranged in vacuum, can be used as eddy current conductors. The vacuum then constitutes the acoustic insulation.
REFERENCES:
patent: 4585995 (1986-04-01), Flugan
patent: 5675255 (1997-10-01), Sellers et al.
patent: 5742164 (1998-04-01), Roemer et al.
Arana Louis
Renfrew Dwight H.
U.S. Philips Corporation
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