Proper tangential imaging of the sesamoid bones in the foot is indicated when:
the sesamoids are projected free of the head of the first metatarsal
the sesamoids are projected into the base of the first metatarsal
the sesamoids are projected free of the base of the first metatarsal
the sesamoids are projected into the head of the first metatarsal
the sesamoids are projected free of the head of the first metatarsal
Rationale: If performed correctly, a tangential, or skimming, beam will cast sesamoids free of superimposition of the head of the first metatarsal.
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