Active control of the sound generation in gradient coils structures for the magnetic resonance imaging

摘要

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 characterised 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.