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Hello, Tim,

Thanks very much for your answer.
Yes. it is very helpful.

I can run the DTIFIT now and all of slices were processed. However, each
created tensor map is all like a mask.  For example, the values of FA in the
brain are all ones.

Maybe the bvals and bvecs files I created are incorrect?
Here is the content of my bvals file
0.0 1000.0 1000.0 1000.0 1000.0 1000.0 1000.0

Here is the content of my bvecs file
0.0 0.70711 -0.70711     0.0      0.0 0.70711 -0.70711
0.0       0      0.0 0.70711  0.70711 0.70711  0.70711
0.0 0.70711  0.70711 0.70711 -0.70711     0.0      0.0

I ran the bedpost_datacheck and everything seems OK.
Whatelse can I check?

Best,

LC