diff --git a/exporters/spline_segmentation_exporter.py b/exporters/spline_segmentation_exporter.py
index 30f76d8..9f60afd 100644
--- a/exporters/spline_segmentation_exporter.py
+++ b/exporters/spline_segmentation_exporter.py
@@ -247,6 +247,16 @@ def draw_segmentation(image_size, control_points, label: int = 1, canvas: np.nda
 
     @staticmethod
     def compute_scaling(image_size, spacing):
+        if len(spacing) > len(image_size):
+            warnings.warn(f'Image is {len(image_size)}D and spacing is {len(spacing)}D.'
+                          f'Dropping the extra axes in the spacing vector.')
+            for n in range(len(spacing) - len(image_size)):
+                spacing.pop(-1)
+        elif len(spacing) < len(image_size):
+            raise ValueError(f'Something wrong with the data:'
+                             f'image is {len(image_size)}D and spacing is {len(spacing)}D.')
+
+        assert len(image_size) == len(spacing), 'Image size and spacing are expected to have the same dimensions.'
         if len(spacing) == 2:
             aspect_ratio = image_size[0] / image_size[1]
             new_aspect_ratio = image_size[0] * spacing[0] / (image_size[1] * spacing[1])