diff --git a/raidionicsmaps/Computation/heatmap_computation_processor.py b/raidionicsmaps/Computation/heatmap_computation_processor.py
index b7ae079..4802dae 100644
--- a/raidionicsmaps/Computation/heatmap_computation_processor.py
+++ b/raidionicsmaps/Computation/heatmap_computation_processor.py
@@ -165,7 +165,7 @@ def __run(self, dense_parameters=None, cat_parameters=None) -> None:
         :return: Nothing, the appropriate files are saved on disk directly
         """
         atlas_ni = nib.load(SharedResources.getInstance().mni_atlas_filepath_T1)
-        atlas = atlas_ni.get_data()
+        atlas = atlas_ni.fget_data()[:]
         heatmap = np.zeros(atlas.shape)
         heatmap_centroids = np.zeros(atlas.shape)