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See the attached figure of the inplane slice, this case happens in a few gradient directions in some subjects. And in the move mode, zebra line jumpings in the cerebellum are seen in most of the gradient directios of mostly all the subjects more or less, but there is no such arrifact in other regions in some subjects. Best Shugao On Mon, Jan 3, 2011 at 5:37 PM, Matt Glasser <[log in to unmask]> wrote: > What do the inplane slices look like that have the dropout (attach a > picture)? This might be motion artifact. > > > > Peace, > > > Matt. > > > ------------------------------ > > *From:* FSL - FMRIB's Software Library [mailto:[log in to unmask]] *On > Behalf Of *Shugao Xia > *Sent:* Monday, January 03, 2011 1:18 PM > *To:* [log in to unmask] > *Subject:* [FSL] Philips DTI data artifacts > > > > Dear FSL experts: > > I have scanned DTI data for about 40 subjects, each with 32 directions of > b=800 and 1 b0 image in 3T Philips, > But in some subjects, seems to have a signal drop-out for some of the > axial slices in a few of the gradient directions, > see (A) in the attached figure. And almost in all the subjects, there are > artifacts (zebra lines) in many graident directions and > these zebra lines are mostly in cerebellum, see (B) in the attached figure. > > Is there anyone who has any experience in this issue? Any comment > /suggestion how to avoid or correct these artifacts when processing these > DTI data will welcome. Thanks ahead > > All the best > > Shugao >