The upper incisors are superimposed over the dens and the posterior occiput's inferior edge is demonstrated about 1 inch (2.5 cm) superior to the dens on an AP atlas and axis projection. How could the positioning setup be adjusted for an optimal projection to be obtained?
1)Align the acanthiomeatal line perpendicular to the IR.
2)Elevate the patient's chin 0.5 inch (2 cm).
3)Adjust the central ray 5 degrees caudally.
4)Move the central ray and IR 1 inch (2.5 cm) superiorly.

Question

Quizplus · Accepted Answer

To obtain an optimal projection for the given scenario, the acanthiomeatal line should be aligned perpendicular to the IR to ensure that the head is properly positioned. Elevating the patient's chin 0.5 inch (2 cm) will help to bring the dens and occiput into alignment, and moving the central ray 5 degrees caudally will help to project the dens more clearly. Moving the central ray and IR superiorly is not necessary for this particular scenario.

The Upper Incisors Are Superimposed Over the Dens and the Posterior