Patent ID: 6501273
Filing Date: 2002-12-31
Classification: G01R,Y10T

Abstract:
A method for three-dimensionally correcting distortions of an image dataset, comprising the steps of:fabricating a magnetic resonance apparatus including a basic field magnet system and a gradient system in a fabrication procedure which includes at least one of a design procedure for said basic field magnet system, a production procedure for said basic field magnet system, a design procedure for said gradient system, and a production procedure for said gradient system; operating said basic field magnet system and said gradient system to respectively generate a basic magnetic field and gradient fields and thereby obtaining an image dataset, each of said basic magnetic field and said gradient fields being subject to respective distortions which produce correspond distortions in said image dataset; in said fabrication procedure, prior to generating said image dataset, determining at least one set of coefficients selected from the group consisting of a first set of coefficients for a spherical function-series expansion of said basic magnetic field and a second set of coefficients for a spherical function-series expansion of at least one of said gradient fields; and correcting said distortions in said image dataset produced by distortions of at least one of said basic magnetic field and said at least one of said gradient fields by employing said first set of coefficients for correcting said distortions in said basic magnetic field and employing said second set of coefficients for correcting said distortions in said a least one of said gradient fields.