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Hi, The "file" needs to be an image file. In your case you want a kernel which is 3x1x1 and contains all ones. This will then just do the dilation in x. You can easily create a file of the appropriate dimensions using fslcreatehd. All the best, Mark On 2 May 2010, at 23:22, Dianne Patterson wrote: > Dear all, > > I am struggling with fslmaths. Here is what I want to do: > > 1) I have a mask of the midsagital slice of the corpus callosum. > > 2) I want to dilate the mask to include equivalent voxels on the > sagittal slice immediately to the right and left of the original > slice. > > I do NOT want the dilation to grow along the z axis or along the y > axis...I only want dilation to extend along the x axis. > > I'm imagining that fslmaths infile -kernel file -dilM outfile might > be the way to do this...but I am having trouble finding > documentation on the format of the "file". > ========================================= > The only alternative I can imagine is that I split the infile into > slices axially, apply 2D dilation to each slice, merge the slices > and then split them sagittally, then 2D erode each sagittal slice > then merge the slices again. There must be a smarter alternative?? > > Thankyou, > > Dianne > > > -- > Dianne Patterson, Ph.D. > [log in to unmask] > University of Arizona > SLHS 328 > 621-5105