To calculate DTI metrics, I did all the analysis steps as you explained in the course on the test data you posted. But the final output is very different from what is expected. I am sure that I have done all the steps correctly and I have checked the output of each step.
I have attached the output. dti_AD.nii.gz (29.8 KB) dti_FA.nii (33.2 KB) dti_MD.nii.gz (29.8 KB) dti_RD.nii.gz (25.2 KB)
I confirm that the DTI metrics you attached are not those expected from the SCT course. There is likely some differences between what you did and the SCT course script, so in order for us to be able to help you, we first need to be able to reproduce exactly what you did. So, could you please include a SHELL script with all the commands you ran, that we can conveniently execute to generate the DTI metrics.