Geometric Distortion Correction in Echo Volumar Imaging

Wenlong Qian¹, Paul M. Glover¹, Richard W. Bowtell¹

Echo volumar imaging (EVI) is highly sensitive distortion due to magnetic field inhomogeneities because of its long echo train length. This sensitivity can be reduced by using parallel imaging to shorten the echo train length, but significant distortion can still remain in images acquired in vivo. Here we have therefore extended two distortion correction methods that have previously been used with EPI to EVI. The first is based on using a field map and the second involves point spread function (PSF) mapping. Images obtained from phantom and human brain show that correction using a PSF-based deconvolution is robust and effective.