If you look at nipype/algorithms/rapidart.py line 49ff you see that nipy is not using euler angles. You can uses this code to convert the output to what you expect to get.

Hi @satra – thanks! But I think i don’t understand enough about rotations to be sure about what this means for my specific question (which I should have probably stated more directly to begin with):

If i want to calculate framewise displacement from the translation and rotation parameters of motion correction, i would usually transform the rotation into displacement on a sphere of a given radius. To do that, it is important to know if the rotations are given in radians or degree.

Now if i want to do the same for the output parameters of SpaceTimeRealigner, how would i go about it?