Patent ID: 6396272
Filing Date: 2002-05-28
Classification: G01R

Abstract:
A method for operating a magnetic resonance apparatus having a gradient tube at which at least one gradient coil is mounted, said gradient coil having current flowing therein during operation of the magnetic resonance apparatus and thereby producing Lorentz forces which cause said gradient tube to exhibit oscillatory behavior in a natural oscillation mode, and having a plurality of force-generating elements which respectively generate forces which collectively act on said gradient tube to oppose said oscillatory behavior of said gradient tube caused by said Lorentz forces, said method comprising the steps of:acquiring at least one measured value representing a criterion for a change in said oscillatory behavior of said gradient tube; storing at least one drive curve in a control unit; generating drive signals in said control unit from said at least one drive curve and driving said force-generating elements with said respective drive signals, each of said drive signals having an amplitude and a phase; and modifying said at least one drive curve dependent on said measured value to vary at least one of the amplitude and the phase of the respective drive signals to modify the respective forces generated by the force-generating elements to account for said change of said oscillatory behavior.