[Mristudio-users] Questions about frames

[Xu Li]

Dear Susumu and Hangyi,

I have one quick questions about the eigenvectors we can get from DTI-Studio. Are they defined in the image frame or the lab frame? I understand that the gradient is applied according to the image frame but the correct gradient table should be defined in lab frame (i.e. if we acquire 0 angulation data, the very first gradient vector would be [0 0 1] or some thing like that).  But after we do the tensor fitting and eigenvalue decomposition, are they still in lab frame? I guess it is, but just want to confirm.

Thanks!

Xu