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Dear SPM users, I am doing a region of interest analysis, and for that want to count the voxels at p < 0.001 in all of my images, in a number of specified ROI's. I use the volume toolbox to extract t-values from my images inside a ROI, but I don't now how I can easily calculate the t threshold which accompanies my desired p level (running the results section of SPM for each different contrast and then looking up the threshold in the results table is going to take a lot of time). I believe the t-threshold is determined based on the p level, the degrees of freedom and smoothness of the images, so maybe I could calculate this myself in matlab, but I am not sure how. Anyone any thought on this? Kind regards, Anna