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Hi, I believe it is necessary if you want a good registration. It is theoretically possible to register EPI scans directly to the average template, but the results are typically much worse than you get if you use a T1-weighted anatomical image of that subject as the intermediate image. If your images have the correct labels in FSLView then you can see it with the same orientation as the template image by doing: fslswapdim origimage RL PA IS reorientedimage Not sure what you mean about the colour bar. It is shown in the FEAT report pages with the activation maps. It is not shown in FSLView, but the colour bar will look the same and have the limits that are displayed in the Min and Max boxes in FSLView. I hope this answers your questions. All the best, Mark On 25 Mar 2010, at 07:50, William Sohn wrote: > Dear FSL community, > > My first question is about registration. Is it absolutely nessary > during FEAT to register the brain to the T1 structural image or can > we just leave it blank? Basically I'm wondering if it is enought > just to register to the MNI template. > > My second question concerning flipping images. Currently the brain > is flipped 90 degrees in my image file. How do I flip the image so > i can view it normally? > > Finally I was wondering if it is possible view the color bar scale > of the threshold activation maps on the same picture. > > -Thank you >