How to extract the V1 image using mrtrix3?

1

I am using mrtrix3 for DWI data analysis and now want to extract the V1 image (named dti_v1.nii.gz if processed with FSL) for visualization. I have checked the tutorials and found that the tensor2metric command can only extract FA, MD, AD, RD, etc., images. Can someone help me solve this problem? Thank you very much!

2

Actually you can also extract eigenvalues and eigenvectors with tensor2metric. To get the first eigenvector you can use the -num and -vector options: tensor2metric dti.mif -num 1 -vector dti_v1.mif