The dorsoplantar foot will direct the central ray:
perpendicular to the midshaft of the 3rd metatarsal
angled 10 degrees cephalic to enter the base of the 3rd metatarsal
angled 10 degrees caudal to enter the base of the 3rd metatarsal
perpendicular to the base of the 3rd metatarsal
angled 10 degrees cephalic to enter the base of the 3rd metatarsal
Rationale: The central ray is angled 10 degrees cephalic and directed to the base of the 3rd metatarsal. The 10 degree cephalic tube angle is added to match the angle of the metatarsals; the beam should intersect the metatarsals perpendicular.
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