Clover Learning Lower Extremities Practice Test

The distance used for calcaneus radiographs is about keeping the geometry consistent and the image sharp while controlling magnification. For both lateral and plantar (axial) views of the calcaneus, 40 inches is standard because it provides a good balance: enough distance to minimize distortion and magnification of the heel bone, yet close enough to maintain good image resolution of fine details like fractures or bone edges. Using this same distance for both views helps ensure comparable image size and geometry, making it easier to assess alignment and pathology between the two projections.

Distances like 36 inches would increase magnification and alter sharpness, while 44 or 48 inches are typically used for other body parts or different projection needs, not the calcaneus. So 40 inches is the best fit for both lateral and plantar calcaneus radiographs.