The plane parallel to the film in lateral cephalography is

The plane parallel to the film of the lateral cephalogram is the sagittal plane of the skull. Placing the film parallel to the sagittal plane of the skull can make the captured image clearer and more accurate, and at the same time reduce the error caused by image distortion. Cranial lateral photography is a common photographic method in medical imaging, which is used to examine the lateral structure of skull.