For a lateral foot radiograph, the central ray should be centered at the base of which metatarsal?

• A. First metatarsal
• B. Third metatarsal
• C. Second metatarsal
• D. Fifth metatarsal

Answer: (B)

For a lateral foot radiograph, the central ray is directed to the base of the third metatarsal. This placement lines the beam up with the foot’s midline, giving a true lateral view where the metatarsals are superimposed and the hindfoot and ankle joints are clearly demonstrated. It helps minimize distortion and ensures the calcaneus, talus, and distal tibiofibular area are captured in profile. Centering further medially at the base of the first metatarsal would skew the projection toward the medial side, while centering at the second or fifth metatarsal would shift the beam away from the midfoot, reducing the quality of the shown anatomy.