Final answer:
When the Central Ray (CR) is angled 40° cephalic, the projection taken is the dorsoplantar axial projection of the calcaneus.
Step-by-step explanation:
If the Central Ray (CR) is angled 40° cephalic, it indicates that you are taking a dorsoplantar axial projection of the calcaneus, also known as the calcis.
In this projection, the central ray is directed from the distal to the proximal end of the foot, angled toward the head of the patient (cephalic), usually while the foot is dorsiflexed. This angle allows for a clear view of the calcaneus without superimposition of other foot structures.