Hi Dear Mrtrix Community.

I am trying to eastimate the DKE/DKI maps estimation using Mrtrix commnad:

dwi2tensor “$dwi_file” “$tensor_output.mif” -mask “$mask_file” -fslgrad “$bvec_file” “$bval_file” -dkt “$dkt_output.mif” -force

as output i get dkt_output.mif, however when i used tensor2metric to get DKE/DKI maps itgive error “[ERROR] unknown option “-rk”” and same for other metrics.

However, at mrtrix documenetation page there is mentioned that you can get Diffusion Kurtosis metrics.

(tensor2metric — MRtrix3 3.0 documentation)

### Diffusion Kurtosis Imaging

**-dkt image**input diffusion kurtosis tensor.**-mk image**compute the mean kurtosis (MK) of the kurtosis tensor.**-ak image**compute the axial kurtosis (AK) of the kurtosis tensor.**-rk image**compute the radial kurtosis (RK) of the kurtosis tensor.**-mk_dirs file**specify the directions used to numerically calculate mean kurtosis (by default, the built-in 300 direction set is used). These should be supplied as a text file containing [ az el ] pairs for the directions.**-rk_ndirs integer**specify the number of directions used to numerically calculate radial kurtosis (by default, 300 directions are used).

Anyone can help, Please