Intraoral x-ray units have a round or rectangular x-ray collimator with the projected beam being slightly larger than the intraoral receptor. In comparison, panoramic x-ray units have a narrow vertical slit aperture. With intraoral units, the vertical and horizontal angle of the PID (position indicating device) is adjusted for each projection and centered over the film. The panoramic x-ray tubehead is fixed at a negative angle (approximately -10°) and rotates behind the patient’s head during the exposure cycle.
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