Siawoosh Mohammadi1, Zoltan Nagy1, Chloe Hutton1, Oliver Josephs1, Nikolaus Weiskopf1
1Wellcome Trust Centre for Neuroimaging, UCL Institute of Neurology, University College London, London, United Kingdom
Vibrations induced by strong diffusion gradients in DTI, cause an echo shift in k-space and consequential signal-loss. Here we present a simple method to correct these vibration artefacts using phase-encoding reversal (COVIPER) by combining two images with reversed PE direction, each weighted by a function of its local tensor fit error. COVIPER was validated against low vibration reference data, resulting in an error reduction of about 72% in FA maps. When COVIPER is combined with other corrections based on phase encoding reversal, they provide a comprehensive correction for eddy currents, susceptibility-related distortions and vibration artefacts in DTI.