Patent ID: 6353319
Filing Date: 2002-03-05
Classification: G01R

Abstract:
A magnetic resonance apparatus comprising:a gradient tube having a circumference, a length, and a middle relative to said length; at least one gradient coil arranged at said gradient tube and having current flowing therein, in the presence of a basic magnetic field, during operation of said gradient coil and thereby producing a Lorentz force which vibrates said gradient tube in a characteristic vibrational mode, said gradient coil being selected from the group of gradient coils comprising, relative to a Cartesian coordinate system, an x-direction gradient coil which produces an X vibrational mode, a y-direction gradient coil which produces a Y vibrational mode, and a z-direction gradient coil which produces a Z vibrational mode; and a plurality of driveable elements attached to said gradient tube which, in combination, produce a vibrational mode in said gradient tube to counteract the vibrational mode produced by said at least one gradient coil, said elements comprising elements selected from the group of elements consisting of a first group of elements, distributed only at said middle and around said circumference of said gradient tube, for producing an X vibrational mode to counteract the X vibrational mode produced by said x-direction gradient coil, a second group of elements, distributed only at said middle and around said circumference of said gradient tube, for producing a Y vibrational mode to counteract the Y vibrational mode produced by said y-direction gradient coil, and a third group of elements, distributed along said length and at respective, separate locations around said circumference of said gradient tube, for producing a Z vibrational mode to counteract the Z vibrational mode produced by said z-direction gradient coil.