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On 11 Mar 2010, at 04:18, Michael T Rubens wrote: > Hi Matt and FSL, > > What is the logic behind interpolating stats instead of raw data? > Would you do the same thing for all of your data (i.e., run the glm > in native space and then normalize cope maps)? That is what we do in FEAT (model-based FMRI analysis). If the processing is linear it doesn't matter what order things are done, and this is then mostly an issue of convenience. If the processing is nonlinear then the optimal order will depend on the specifics. Cheers. > > Thanks, > Michael > > On Wed, Mar 10, 2010 at 6:51 PM, Matt Glasser <[log in to unmask]> wrote: > That is not the right way to go about things. You should leave the > voxel > dimensions at 2x2x2mm and then Register the FA to the T1 to get the > desired > overlay. It is MUCH better to interpolate the calculated data than to > interpolate the raw data and then calculate. This is especially > true if you > want to do tractography. You can easily still specify masks in > structural > space and then specify the structural to diffusion transform. > > Peace, > > Matt. > > -----Original Message----- > From: FSL - FMRIB's Software Library [mailto:[log in to unmask]] On > Behalf > Of Adil Javed > Sent: Wednesday, March 10, 2010 6:20 PM > To: [log in to unmask] > Subject: [FSL] DTI imaging > > Hi, > for those who are experts in DTI: > I am acquiring DTI images on 3.0T Phillips scanner using 32 > directions, FOV > 240, acquired matrix is 120 x 118 with acquired voxel dimensions of > 2x2x2. > In order to overlay DTI FA/MD/ or tracts on a FLAIR or T1 image, I > need to > reconstruct the matrix to 256 with voxel RECON to 0.94 x 0.94 x 2 > so they > align with my FLAIR or T1 images. > > Question: is this ok or do you see any problems with this > approach? By > reconstructing voxels down to 0.94 x 0.94 x 2 after they are > Acquired in > 2x2x2 size, am I losing any information? > > many thanks for your help. > > adil > > > > -- > Research Associate > Gazzaley Lab > Department of Neurology > University of California, San Francisco --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) [log in to unmask] http://www.fmrib.ox.ac.uk/~steve ---------------------------------------------------------------------------