Correction of errors in magnetic resonance images due to magnetic gradient non-uniformity

摘要

A system and method for correcting systematic errors that occur in MR images due to magnetic gradient non-uniformity is disclosed for use with parametric analysis. A GradWarp geometric correction operation is applied in reconstructing quantitative parametric analysis images in regions of gradient non-uniformity. The method includes generating an error map of magnetic gradient strength as a function of distance for an MR image scan and acquiring MR data (60) that contain such systematic errors. The method next includes either calculating a measured diffusion image, a phase difference image (62,64,66), or similar image, based on the acquired MR data, and then calculating a corrected parametric image (68,70,72) using the error map and the measured diffusion image, the phase difference image, or other similar parametric image. The method is incorporated into a system having a computer programmed to perform the aforementioned steps and functions.