Added FSL output type NIFTI to dmri mrtrix example

Author: Erik Ziegler

examples/dmri_mrtrix_dti.py

@@ -27,6 +27,8 @@
 import nipype.algorithms.misc as misc
 import os, os.path as op                     # system functions
 
+fsl.FSLCommand.set_default_output_type('NIFTI')
+
 """
 This needs to point to the fdt folder you can find after extracting