Update niworkflows/interfaces/cifti.py

Co-authored-by: Chris Markiewicz <[email protected]>

Author: mgxd

niworkflows/interfaces/cifti.py

@@ -364,7 +364,7 @@ def _create_cifti_image(
                 annot = nb.load(annotation_files[hemi == "RIGHT"])
                 medial = np.nonzero(annot.darrays[0].data)[0]
             # extract values across volumes
-            ts = np.array([tsarr.data[medial] for tsarr in surf_ts.darrays])
+            ts = surf_ts.agg_data("time series")[medial, :]
 
             vert_idx = ci.Cifti2VertexIndices(medial)
             bm = ci.Cifti2BrainModel(