For the clavicle AP projection, what is the corresponding cephalic angle?

For the clavicle AP projection, what is the corresponding cephalic angle?

• A. 15 caudal
• B. 15 cephalic
• C. 30 caudal
• D. 30 cephalic

Answer: (B)

The main idea is that for an AP clavicle view you tilt the beam toward the head to align with the clavicle’s axis, helping to project the clavicle clearly above the thorax. A 15-degree cephalad angle is the standard choice because it lengthens and separates the clavicle from the thoracic structures, reducing superimposition by the ribs and scapula. Using a caudal angle would push the clavicle into the thorax and worsen overlap, while a larger angle (like 30 degrees) can introduce distortion and isn’t the typical protocol for a standard AP clavicle shot. So, the correct cephalad angle is 15 degrees toward the head.

The main idea is that for an AP clavicle view you tilt the beam toward the head to align with the clavicle’s axis, helping to project the clavicle clearly above the thorax. A 15-degree cephalad angle is the standard choice because it lengthens and separates the clavicle from the thoracic structures, reducing superimposition by the ribs and scapula. Using a caudal angle would push the clavicle into the thorax and worsen overlap, while a larger angle (like 30 degrees) can introduce distortion and isn’t the typical protocol for a standard AP clavicle shot. So, the correct cephalad angle is 15 degrees toward the head.