Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2006-04-25
2006-04-25
Gutierrez, Diego (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S319000, C324S307000
Reexamination Certificate
active
07034537
ABSTRACT:
An MRI apparatus having an open structure includes a static magnetic field generating magnet including magnetic field generating sources arranged above and below an imaging space and magnetic field fluctuation reducing plates arranged inside the magnet. Gradient magnetic field coils are fixed to the static magnetic field generating magnet so as to not be in contact with the magnetic field fluctuation reducing plates. When the strength of the magnetic field generated by the static magnetic field generating magnet fluctuates due to vibration of the gradient magnetic field coils or other devices during an imaging operation of the MRI apparatus, an eddy current is generated on the magnetic field fluctuation reducing plates in response to the magnetic field fluctuation components. Magnetic flux which cancels the static magnetic field fluctuation components is generated due to this eddy current, and consequently, a time-sequentially stable static magnetic field can be obtained.
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Miyawaki Shouichi
Takeuchi Hiroyuki
Tsuda Munetaka
Yoshino Hitoshi
Antonelli, Terry Stout and Kraus, LLP.
Fetzner Tiffany A.
Gutierrez Diego
Hitachi Medical Corporation
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