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You may wish to change the voxel sizes and bounding box in order to obtain slightly lower resolution versions (other than the default 1.5mm isotropic with a large bounding box). See the email I sent out recently. Best regards, -John On 15 February 2011 17:29, Richard Binney <[log in to unmask]> wrote: > Dear John (and other knowledgeable types), > > I used the deformation file (e.g., Y_p1_T1.nii) from Seg8 to normalise a > functional MRI timeseries. That worked fine - the anatomical images that > I additionally warped in this way look great - but I now cannot do anything > with the timeseries. > > It is now almost 4Gb in size. I appreciate that using DARTEL to warp fMRI > data can result in massive files which are problematic (and thus a work > around is to apply the warp to contrast images), but I didn't expect the > segment deformation field to do the same. > > Does this sound about right for a timeseries with 465 volumes (voxel dim 2.5 > x 2.5 x 3; matrix 96x96; numslices = 42)? Or have I made a mistake > somewhere? > > so I'm supposing my inability to use the warped timeseries is a memory > issue - I am running a 64-bit machine with 8Gb memory (I can see all this > being used in the task manager so doesn't seem to be a matlab version > problem) but maybe this file is just way too big for the SPM > platform.....???? I could crop the image, etc I suppose but maybe the > biggest problem is the shear number of volumes. > > Thanks in advance for your thoughts > > Richard > > On Thu, Feb 10, 2011 at 4:05 PM, William Pettersson-Yeo > <[log in to unmask]> wrote: >> >> Thanks John. >> >> It turns out the problem was due to the version of Matlab I was running. >> >> Matlab2007 was only running 32bit, whilst the 2010 version is 64. >> >> Having set up with Matlab2010, the new segmentation with DARTEL import now >> runs without any problem, without me having to alter/crop any of the images. >> >> All the best >> William > >