Active control of sound generation in MRI gradient coil structures
OwnerPaul Mansfieldinventor
Life of this patent
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Abstract
An acoustically quiet gradient coil structure for a magnetic resonance imaging system, said coil structure comprising one or more conductors embedded in a plate of acoustically transmitting material, said plate having one or more edge surfaces characterized in that at least one edge surface (100, 102, 104, 106) of said plate is chamfered. The plate may comprise a composite cellular structure of cellular materials having positive and negative Poisson's ratio σ such that the overall σ is substantially zero.
Claims38
An acoustically quiet coil structure for a magnetic resonance imaging system, said coil comprising one or more electrical conductors and comprising a plate of acoustically transmitting material, said electrical conductors being either embedded directly into the plate or into a capping strip to the plate, said plate having a plurality of surfaces in which at least one surface of said plate is provided with at least one chisel shaped, serrated or chamfered surface feature, said surface feature providing means for suppressing internal reflections of sound waves within the plate.
An acoustically quiet coil structure for a magnetic resonance imaging system, sail coil comprising one or more conductors embedded in a plate of material, said plate comprising a composite cellular structure of cellular materials having positive and negative Poisson's ratio σ such that the overall σ is substantially zero.
Dependencies are inferred from the claim text.