Patent ID: 6825667
Filing Date: 2004-11-30
Classification: G01R

Abstract:
A method for maintaining uniformity of a static magnetic field generated by a static magnetic field generating unit in a magnetic resonance imaging apparatus, by generating an additional magnetic field when said apparatus receives a current from a power source, the method comprising the steps of:calculating a temperature dependence of the local non-uniformity of distribution of the static magnetic field in an inspection space provided for an object to be examined, said local non-uniformity of distribution of the static magnetic field being caused by temperature change of the static magnetic field generating unit and/or the local surroundings thereof; and detecting a temperature of the static magnetic field generating unit and/or the local surroundings thereof; and generating the additional magnetic field having a magnetic field distribution that corrects said local non-uniformity of the distribution of the static magnetic field within said inspection space, wherein the spatial distribution of the additional magnetic field is adjusted when the current is supplied by the power source to said apparatus, based on the detected temperature of said static magnetic field generating unit and/or the local surroundings thereof.