Iodine I 124 Iododeoxyuridine

**Semantic type:** Pharmacologic Substance

**Definition:** A radiopharmaceutical comprised of the thymidine analog, 5-iodo-2-deoxyuridine (idoxuridine), labeled with the positron emitter iodine I 124. After incorporation into tumor cell DNA, positron emission tomography (PET) is used to image iodine I 124 localized to tumor cells for determining and monitoring tumor burden.

**Synonyms:** - I-124 Iododeoxyuridine