Radiologic Technologist Practice Exam

On a PA axial projection of the mandibular rami, in which direction is the central ray angled?

1. Caudal

2. Cephalic

3. Medial

4. Lateral

The correct answer is: Cephalic

On a PA axial projection of the mandibular rami, the central ray is angled cephalically. This projection is designed to demonstrate the mandibular rami clearly, allowing the radiologist to visualize the anatomy and any potential pathologies effectively. The cephalic angle helps to project the rami away from the maxilla and frontal bone, minimizing superimposition and providing a clearer image. The cephalic angling is particularly important in ensuring that the image captures the ramus structure without distortion, which would occur if the central ray were directed caudally, leading to incorrect positioning of the anatomy. Proper angling facilitates better visualization of the coronoid and condylar processes, essential for accurate diagnosis.