[X-ray study of the canal of the vidian nerve]

Examination of macerated skulls has shown that optimal tomographic images of the Vidian nerve are obtained when the physiological horizontal plane is normal to the table plane and the X-ray beam is as narrow as possible. The section depth varies from 6.0 to 6.5 cm in brachycephalic and from 7.0 to 7.5 cm in dolichocephalic individuals. This positioning has been verified in 25 patients.