The Cause of a Panoramic Image That Comes Out with a Radiopaque

Multiple Choice

The cause of a panoramic image that comes out with a radiopaque cone-shaped artifact that interferes with the diagnostic information is the:

A) patient's chin was too high during the procedure.
B) patient's lead apron was incorrectly placed or a lead apron with a thyroid collar was used.
C) patient's head was posterior to the focal trough.
D) patient moved during the procedure.