diff --git a/diffdrr/drr.py b/diffdrr/drr.py
index f0e631339..24bedeaf8 100644
--- a/diffdrr/drr.py
+++ b/diffdrr/drr.py
@@ -189,6 +189,8 @@ def perspective_projection(
     x = torch.einsum("ij, bnj -> bni", self.detector.intrinsic, x)
     z = x[..., -1].unsqueeze(-1).clone()
     x = x / z
+    if self.detector.reverse_x_axis:
+        x[..., 1] = self.detector.width - x[..., 1]
     return x[..., :2]
 
 # %% ../notebooks/api/00_drr.ipynb 13
diff --git a/notebooks/api/00_drr.ipynb b/notebooks/api/00_drr.ipynb
index 62889ea49..b8a3e0b8d 100644
--- a/notebooks/api/00_drr.ipynb
+++ b/notebooks/api/00_drr.ipynb
@@ -322,6 +322,8 @@
     "    x = torch.einsum(\"ij, bnj -> bni\", self.detector.intrinsic, x)\n",
     "    z = x[..., -1].unsqueeze(-1).clone()\n",
     "    x = x / z\n",
+    "    if self.detector.reverse_x_axis:\n",
+    "        x[..., 1] = self.detector.width - x[..., 1]\n",
     "    return x[..., :2]"
    ]
   },
diff --git a/notebooks/tutorials/introduction.ipynb b/notebooks/tutorials/introduction.ipynb
index f94edcf9f..523c0d9fb 100644
--- a/notebooks/tutorials/introduction.ipynb
+++ b/notebooks/tutorials/introduction.ipynb
@@ -424,8 +424,7 @@
     "\n",
     "- `bone_attenuation_multiplier = 0` completely removes bones\n",
     "- `bone_attenuation_multiplier > 1` increases the contrast of bones relative to soft tissue\n",
-    "\n",
-    "This roughly simulates increasing the kVp of the X-ray imaging system."
+    "  "
    ]
   },
   {