A patient is unable to elevate the chin enough for a parietoacanthial facial bone projection (Wa-ters method). How could the positioning setup be adjusted for an optimal projection to be ob-tained?
a. Angle the central ray cephalically.
b. The projection cannot be obtained.
c. Align the central ray parallel with the MML.
d. Elevate the patient's chin as far as possible and use a perpendicular central ray.
Question 2
A poorly positioned parietoacanthial facial bone projection (Waters method) demonstrates the petrous ridges within the maxillary sinuses. How was the positioning setup mispositioned for such a projection to be obtained?
1. The MML was not aligned perpendicular to the IR.
2. The patient's head was rotated toward the left side.
3. The patient's chin was tucked more than needed.
4. The central ray was angled too cephalically.
a. 1 and 3 only
b. 2 only
c. 3 and 4 only
d. 1, 3, and 4 only
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