diff --git a/.gitignore b/.gitignore
index 01ff62ca1..92dfba872 100644
--- a/.gitignore
+++ b/.gitignore
@@ -96,3 +96,6 @@ target/
 
 # Mypy cache
 .mypy_cache/
+
+# Jupyter notebooks
+**/.last_checked
diff --git a/diffdrr/renderers.py b/diffdrr/renderers.py
index d26ade481..4d1b691fc 100644
--- a/diffdrr/renderers.py
+++ b/diffdrr/renderers.py
@@ -73,7 +73,9 @@ def forward(
             # https://stackoverflow.com/questions/78323859/broadcast-pytorch-array-across-channels-based-on-another-array/78324614#78324614
             B, D, _ = img.shape
             C = int(mask.max().item() + 1)
-            channels = _get_voxel(mask, xyzs, align_corners=align_corners).long()
+            channels = _get_voxel(
+                mask, xyzs, self.mode, align_corners=align_corners
+            ).long()
             img = (
                 torch.zeros(B, C, D)
                 .to(img)
@@ -203,7 +205,9 @@ def forward(
         else:
             B, D, _ = img.shape
             C = int(mask.max().item() + 1)
-            channels = _get_voxel(mask, xyzs, align_corners=align_corners).long()
+            channels = _get_voxel(
+                mask, xyzs, self.mode, align_corners=align_corners
+            ).long()
             img = (
                 torch.zeros(B, C, D)
                 .to(img)
diff --git a/notebooks/api/01_renderers.ipynb b/notebooks/api/01_renderers.ipynb
index af20b3e47..1947303f9 100644
--- a/notebooks/api/01_renderers.ipynb
+++ b/notebooks/api/01_renderers.ipynb
@@ -175,7 +175,7 @@
     "            # https://stackoverflow.com/questions/78323859/broadcast-pytorch-array-across-channels-based-on-another-array/78324614#78324614\n",
     "            B, D, _ = img.shape\n",
     "            C = int(mask.max().item() + 1)\n",
-    "            channels = _get_voxel(mask, xyzs, align_corners=align_corners).long()\n",
+    "            channels = _get_voxel(mask, xyzs, self.mode, align_corners=align_corners).long()\n",
     "            img = (\n",
     "                torch.zeros(B, C, D)\n",
     "                .to(img)\n",
@@ -334,7 +334,7 @@
     "        else:\n",
     "            B, D, _ = img.shape\n",
     "            C = int(mask.max().item() + 1)\n",
-    "            channels = _get_voxel(mask, xyzs, align_corners=align_corners).long()\n",
+    "            channels = _get_voxel(mask, xyzs, self.mode, align_corners=align_corners).long()\n",
     "            img = (\n",
     "                torch.zeros(B, C, D)\n",
     "                .to(img)\n",