An AP Atlas and Axis Projection with Poor Positioning Demonstrates

question 33

Multiple Choice

An AP atlas and axis projection with poor positioning demonstrates the dens superimposed over the posterior occiput. The upper incisors are demonstrated about 3 inches (7.5 cm) superior to the posterior occiput's inferior edge. How could the positioning setup be adjusted for an optimal projection to be obtained?
1) Adjust the central ray 15 degrees caudally.
2) Tuck the patient's chin 1.5 inches (3.75 cm) .
3) Align the acanthiomeatal line perpendicular to the imaging table.
4) Move the central ray and IR 3 inches (7.5 cm) inferiorly.

• A) 1 and 2 only
• B) 2 and 3 only
• C) 1, 2, and 3 only
• D) 3 and 4 only

---

Definitions:

PST

Provincial Sales Tax, a tax levied by some provinces in Canada on the sale of goods and services.

GST

A tax on goods and services meant for domestic consumption, the Goods and Services Tax is a value-added tax charged on most products and services.

Grade Point Average

A numerical calculation that represents the average value of the accumulated final grades earned in courses over time, standardized on a scale.

Letter Grades

Letter Grades are symbols used in educational institutions to represent the quality of a student's work or performance, ranging typically from A (excellent) to F (failure).