Reduction of geometric and intensity distortions in echo‐planar imaging using a multireference scan

摘要: Echo-planar imaging (EPI) is very sensitive to patient-induced field inhomogeneity caused by susceptibility changes between different anatomical regions. This results in geometric and intensity distortions the image, especially near tissue/ air tissue/bone interfaces. A new approach presented reduce EPI. phase-encoded multireference scan used estimate amplitude phase errors measured signals due inhomogeneity. The EPI data corrected using both of errors. technique has been evaluated pulse sequences implemented with conventional gradients systems that have special resonating fast analog digital converters. phantom human studies show absence object motion correction can effectively distortions.