Dear FreeSurfer,

I am trying to pre-process my DTI data using TRACULA. But I receive an error when I run the pre-processing stage of DTI image processing. On the Correction step (1^st step) I receive this error:

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MRIresample(): error inverting matrix; determinant is nan, matrix is:

-0.000  -0.000  nan  nan;

-0.000  -0.000  nan  nan;

 0.000   0.000  nan  nan;

 0.000   0.000   0.000   1.000;

Darwin Mahtabs-MBP 16.3.0 Darwin Kernel Version 16.3.0: Thu Nov 17 20:23:58 PST 2016; root:xnu-3789.31.2~1/RELEASE_X86_64 x86_64

trac-preproc exited with ERRORS at Mon Jan  2 03:23:23 IRST 2017

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My DTI images are in enhanced DICOM format. In addition, I receive a warning earlier in the processing stage. The warning is:

 WARNING: it appears that the image position for all slices is the same. 

 This is a problem with the DICOM file. Using direction cosines from col and row

 to compute slice direction, but the output may be misoriented. 

Please also find my log file attached to the mail.

Any kind guidance from you is much appreciated.

Kind Regards,

Mahtab.

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