Fluorine F 18 EF5

**Semantic type:** Pharmacologic Substance

**Definition:** A radioconjugate consisting of EF5, a fluorinated derivative of etanidazole, conjugated to fluorine F 18, a positron emitting isotope. EF5 binds to hypoxic tissue; conjugation to Fluorine F 18 allows imaging of hypoxic regions within tumors. (NCI05)

**Synonyms:** - 18F-EF5 - F18-EF5 - fluorine F 18 EF5