FIX: Conditionally drop isotropic frames

nipy · Feb 23, 2024 · 3f81a96 · 3f81a96
1 parent bc227ec
commit 3f81a96
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/nibabel/nicom/dicomwrappers.py b/nibabel/nicom/dicomwrappers.py
@@ -509,11 +509,14 @@ def image_shape(self):
         if hasattr(first_frame, 'get') and first_frame.get([0x18, 0x9117]):
             # DWI image may include derived isotropic, ADC or trace volume
             try:
-                self.frames = pydicom.Sequence(
+                anisotropic = pydicom.Sequence(
                     frame
                     for frame in self.frames
                     if frame.MRDiffusionSequence[0].DiffusionDirectionality != 'ISOTROPIC'
                 )
+                # Image contains DWI volumes followed by derived images; remove derived images
+                if len(anisotropic) != 0:
+                    self.frames = anisotropic
             except IndexError:
                 # Sequence tag is found but missing items!
                 raise WrapperError('Diffusion file missing information')