Which of the following describes the correct head positioning for a panoramic radiograph?
A) Midsagittal plane parallel to the floor and ala-tragus line perpendicular to the floor
B) Frankfort plane and midsagittal plane perpendicular to the floor
C) Ala-tragus line parallel to the floor and Frankfort plane 5 degrees toward the floor
D) Frankfort plane parallel to the floor and midsagittal plane perpendicular to the floor
D
Explanation: A) Correctly positioning the patient's Frankfort plane parallel to the floor and midsaggital plane perpendicular to the floor will place the arches within the focal trough.
B) Correctly positioning the patient's Frankfort plane parallel to the floor and midsaggital plane perpendicular to the floor will place the arches within the focal trough.
C) Correctly positioning the patient's Frankfort plane parallel to the floor and midsaggital plane perpendicular to the floor will place the arches within the focal trough.
D) Correctly positioning the patient's Frankfort plane parallel to the floor and midsaggital plane perpendicular to the floor will place the arches within the focal trough.
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