DT.nii and KT.nii

[Luoyu-Wang]

Hello everyone,

I have a couple of questions regarding the DT.nii and KT.nii that I hope you can help clarify.

1 Is the order of the components in DT.nii files consistent with those produced by FSL fitting?
2 For the KT.nii file, are the kurtosis coefficients ordered as Kxxxx, Kyyyy, Kzzzz, Kxxxy, etc.?
3 For multi-shell data, when calculating the DT.nii, is it the result of fitting from the DKI calculation, or is it derived from fitting DTI, such as by extracting data around b=1000? Could you please clarify this for my understanding?
I appreciate any insights or references you could provide on these topics. Thanks in advance for your help!