How should the image receptor be positioned for a calcaneal axial radiograph?

• A. Image receptor centered to ankle with plantar foot perpendicular to it
• B. Image receptor placed under knee
• C. Image receptor oriented medially
• D. Image receptor at 90 degrees to plantar surface

Answer: (A)

For an axial calcaneus view, the image receptor should be placed under the ankle so the calcaneus sits on the film, and the plantar surface of the foot is aligned in relation to the receptor with the plantar aspect oriented toward the receptor. This setup brings the calcaneus into proper overlap with the IR, minimizes distortion, and allows the axial beam to projection through the calcaneal body and subtalar joint with the requested angular projection. Positioning the receptor elsewhere, such as under the knee, or orienting the foot differently, would not provide the correct geometry to visualize the calcaneus in an axial technique.