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Hi - I am having some odd results using dtifit on some of our data. When I compute FA maps using an older custom program, I get very reasonable results, with FA ranging from zero to one and with high FA values where they should be (e.g., corpus callosum). When I run dtifit on the same data, I get some odd results. First, the FA values in the corpus callosum are very low. Second, the range of FA values is a bit strange. Within voxels that are not exactly zero-valued, the minimum FA value is about 0.35; this compares to our previous results where the minimum FA value was around .01. In addition, the maximum FA value is greater than zero (1.15 in this dataset). Any ideas as to what might be causing this? cheers russ --- Russell A. Poldrack, Ph.D. Assistant Professor of Psychology, UCLA Franz Hall, Box 951563 Los Angeles, CA 90095-1563 email: [log in to unmask] phone: 310.794.1224 fax: 310.206.5895 web: http://www.poldracklab.org/