On the documentary "Raising Hell: Filming The Exorcist" included with the 2010 Extended Director's Cut, author William Peter Blatty reminisces that the supernatural/demonic sequences did not inspire patrons to flee theater, nor were they responsible for nausea in the aisles. The scene in which Regan undergoes carotid angiography, using direct carotid puncture and pneumoencephalography was the moment in "The Exorcist" which upset theatergoers. This procedure entails cerebrospinal fluid being drained to a small amount from around the brain and replaced with air, oxygen, or helium to allow the structure of the brain to show up more clearly on an X-ray picture.

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