Electricity: measuring and testing – Particle precession resonance – Spectrometer components
Reexamination Certificate
2005-07-12
2005-07-12
Arana, Louis (Department: 2859)
Electricity: measuring and testing
Particle precession resonance
Spectrometer components
C324S322000
Reexamination Certificate
active
06917200
ABSTRACT:
It is possible to suppress noise by intensively damping mechanical vibrations in MRT devices, especially gradient coils and magnet vessels, using compound materials containing centers of negative stiffness. The invention relates to a core spin tomography device, wherein the vibrations of the device components, which can in many aspects have a negative effect on the entire system, can be reduced or the noise transmission paths can be reduced. The core spin tomography device has a basic field magnet which is surrounded by a magnet envelope which surrounds and defines an inner area, a gradient coil system being disposed inside the inner area. Damping elements made of a material having a negative stiffness are arranged on an inner side of the magnet envelope defining the inner area in order to absorb acoustic vibrations which are produced during switching of the gradient coil system.
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R.S. Lakes et al.; Extreme Damping in Composite Materials with Negative Stiffness Inclusions; NATURE; Mar. 29, 2001; vol. 410; S. 565-567.
R.S. Lakes; Extreme Damping in Composite Materials with a Negative Stiffness Phase; Phys Rev Lett; Physical Review Letters; Mar. 26, 2001.
Arana Louis
Schiff & Hardin LLP
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