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Dear Tim Re-checking the bvecs, I found one gradient direction was not normalized. After correcting the bvecs, the DTIFIt is ok now. But FA values for some pixels seems larger than one? Thanks again for your help rhuang On Sunday 31 October 2004 18:17, you wrote: > Hi there - > We are aware of this problem. These "errors" are not really errors - they > are the standard output of eddy_correct. They are just being reported as > errors by the GUI - we will fix this for the next release. For now, just > ignore them - The output files of eddy_correct will be fine. > > Cheers > > T > > --------------------------------------------------------------------------- >---- Tim Behrens > Centre for Functional MRI of the Brain > The John Radcliffe Hospital > Headley Way Oxford OX3 9DU > Oxford University > Work 01865 222782 > Mobile 07980 884537 > --------------------------------------------------------------------------- >---- > > On Sun, 31 Oct 2004, R Huang wrote: > > Hello > > > > I have got error message when I running eddy current corrections. > > > > The diffusion-weighted data were converted > > into 4D analsyse format using mricro, 1+12 volumes > > with one b=0 and 12b=1000. I tried 3 times > > running 'eddy-current correction'. Every time, > > a popup window reported the following error message: > > > > Errors: Writing vol0000 > > Writing vol0001 > > Writing vol0002 > > Writing vol0003 > > > > ... > > Writing vol0012 > > > > Two files, (data.nii.gz) and (gata.ecclog) > > were created. > > > > > > Any suggestions for using 'eddy current correction'? > > > > Thanks in advance > > > > rhuang