Which projection uses elongation to improve visualization of the calcaneus?

Which projection uses elongation to improve visualization of the calcaneus?

• A. AP axial (Towne) skull.
• B. AP lordotic chest.
• C. Axial projection of the calcaneus with a 40-degree angle.
• D. Lateral calcaneus.

Answer: (C)

Imaging the calcaneus benefits from projecting along its length to reduce overlap with surrounding bones and to reveal its anatomy more clearly. An axial projection of the calcaneus does exactly that by angling the beam so it travels along the long axis of the bone. When the foot is positioned with the plantar surface near vertical and the CR angled toward the heel (about 40 degrees cephalad), the calcaneus is shown elongated on the image. This elongation helps separate the calcaneus from adjacent structures, making features like the calcaneal tuberosity and subtalar joint easier to evaluate. The other views listed don’t use this angulation to lengthen the calcaneus; they’re designed for different anatomy (skull, chest) or show the calcaneus from the side, which doesn’t provide the same elongated view.

Imaging the calcaneus benefits from projecting along its length to reduce overlap with surrounding bones and to reveal its anatomy more clearly. An axial projection of the calcaneus does exactly that by angling the beam so it travels along the long axis of the bone. When the foot is positioned with the plantar surface near vertical and the CR angled toward the heel (about 40 degrees cephalad), the calcaneus is shown elongated on the image. This elongation helps separate the calcaneus from adjacent structures, making features like the calcaneal tuberosity and subtalar joint easier to evaluate. The other views listed don’t use this angulation to lengthen the calcaneus; they’re designed for different anatomy (skull, chest) or show the calcaneus from the side, which doesn’t provide the same elongated view.