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Dear all, How can I know if my data is averaged on scanner? I am working on 1.5T Siemens Sonata, I convert my DICOMs using MRIconvert to 4D nifti format. The file I get (before eddy_correct) has just 13 volumes (1xb=0 and 12xb=1000), although my NEX is 4. According to the TBSS-related paper (Smith et al., Nat Prot, March 2007) one should avoid on-scanner averaging. Does it mean that after data conversion I should get a file with 13x4 volumes (if I have 12 DW grad directions and 4 NEX), then eddy_correct them and average images with the same gradient direction before brain mask creation? Thank you for any suggestion, Best, Aga