Dear Dr. @fedorov,
Thanks to your help, I’ve already tried @pieper’s python code, and it was successful in saving NIFTI files in NRRD files.
However, when I enter these NRRD files as inputs to DSCMRIAnalysis module, then it does not recognize frame identifying DICOM tag (error msg below).

I’ll send you a 4D DSC DICOM as well as NIFTI files in email.
Could you please fix this problem?
I always appreciate it.
All the best,
Kyu Sung