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Thanks very much! On Thu, Mar 5, 2009 at 7:08 PM, Matt Glasser <[log in to unmask]> wrote: > Some things to keep in mind about DTI acquisitions: It’s better to have > more directions and less averages (30 directions would be good, 60 would be > great). You want each individual average to be saved separately so you can > remove subject motion. You don’t want your scanner to interpolate the > images. You want your voxels to be isotropic if possible (many people use > 2mmX2mmX2mm). It is better to correct the EPI distortion with a field map > or other method. The scans do not have to be in the same plane or have the > same resolution, but ideally you would correct for any distortion in both > and then register them to your anatomical scan with a 6 degrees of freedom > (or rigid body) approach. > > > > Peace, > > > Matt. > ------------------------------ > > *From:* FSL - FMRIB's Software Library [mailto:[log in to unmask]] *On > Behalf Of *Dianne Patterson > *Sent:* Thursday, March 05, 2009 7:26 PM > *To:* [log in to unmask] > *Subject:* [FSL] dti and fmri: newbie setup issues > > > > Dear Group, > > I've been doing dti analyses for a little over a year now. > Some colleagues and I are intrigued by the possibility of doing > connectivity sorts of analyses. > They have an fmri protocol they are about to collect pilot data for, and we > thought we'd tack on a dti sequence to this. > > Are there any pitfalls/considerations that we should be aware of? > For example, is there any reason to be concerned with making sure the dti > and fmri scans are in the same plane or have the same resolution? > > Our fmri sequences are spirals, but our dti sequences are normal epis with > the associated distortions. > > Any suggestions would be greatly appreciated...we don't want to re-invent > the wheel here. > > Thankyou, > > Dianne > > -- > Dianne Patterson, Ph.D. > [log in to unmask] > University of Arizona > SLHS 328 > 621-5105 > -- Dianne Patterson, Ph.D. [log in to unmask] University of Arizona SLHS 328 621-5105