import nipype.interfaces.io as nio
import nipype.pipeline.engine as pe
volsource = pe.Node(interface = nio.DataGrabber(outfields=["dw_imgs"]), name="volsource")
project_dir = "/mindhive/gablab/sad/PY_STUDY_DIR/Block"
volsource.inputs.base_directory = project_dir
volsource.inputs.template = "diffusion/preproc/SAD_*/%s_warp.nii.gz"
volsource.base_dir = '.'
volsource.inputs.template_args = dict(dw_imgs=[[["fa", "ra", "adc"]]])
res = volsource.run()