I was wondering if there is any documentation on the method used to process datasets that include two (or more) b-values (e.g., 1200, 800) in dtifit? I checked the FDT appendix, but, based on my limited understanding of the mechanics, I could not tell if the methods were generalizable for > 1 b-value. Is there a bi-exponential fit at some point prior to solving for tensor elements? I greatly appreciate any information and/or pointers to relevant literature. Thanks, Brian