Siawoosh Mohammadi1, Michael Deppe1,
Harald E. Moller2
1Department of Neurology, University of
Muenster, Muenster, NRW, Germany; 2Magnetic Resonance Unit, Max
Planck Institute for Human Cognitive and Brain Sciences, Leipzig, Sachsen,
Germany
The
strong lobes of the diffusion gradients cause different kinds of MR
artifacts, like eddy-current (EC) and vibration effects. While EC effects
could significantly be reduced using a twice-refocused spin-echo (TRSE)
sequence for DTI acquisition, the vibration effects become more evident when
the TRSE sequence is used. We showed that the vibration-induced motion leads
to an affine scaling effect in x and y-direction that could be
retrospectively corrected. While the y scaling is also subject to EC effects,
the x scaling seems to correct solely vibration effects and might thus be
usable for comparing vibration effects of different data sets.