Where is the central ray located for a plantodorsal axial calcaneus radiograph?

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Prepare for the Clover Learning Lower Extremities Test. Access multiple choice questions with hints and explanations to enhance understanding. Ace your exam confidently!

Multiple Choice

Where is the central ray located for a plantodorsal axial calcaneus radiograph?

Explanation:
For a plantodorsal axial calcaneus view, the beam must travel along the calcaneus’ long axis to produce a true axial projection of the heel. The central ray is directed cephalad and enters the plantar aspect at the base of the third metatarsal. This entry point aligns the beam with the calcaneus so the calcaneal body, subtalar joint, and tuberosity are clearly seen without distortion. Entering at the base of the fifth metatarsal, at the ankle joint, or through the midfoot would not align with the calcaneus’ long axis and would compromise the image.

For a plantodorsal axial calcaneus view, the beam must travel along the calcaneus’ long axis to produce a true axial projection of the heel. The central ray is directed cephalad and enters the plantar aspect at the base of the third metatarsal. This entry point aligns the beam with the calcaneus so the calcaneal body, subtalar joint, and tuberosity are clearly seen without distortion. Entering at the base of the fifth metatarsal, at the ankle joint, or through the midfoot would not align with the calcaneus’ long axis and would compromise the image.

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