Everything Radiologists Need to Know about Radioiodine: The Royal Radiopharmaceutical for Diagnosis and Therapy of Thyrotoxicosis

Objectives: 1. Explain how the properties of the common radioiodines make them the ideal radiopharmaceuticals for thyroid uptake and imaging (¹²³I) and therapy (¹³¹I). 2. Review the role and application of ¹²³INa in the work-up of thyrotoxicosis. 3. Review the role and application of ¹³¹INa in the non-invasive therapy of hyperthyroidism.

Methods: This will be an image-rich, case-based review of the role of the common radioiodines (¹²³INa, ¹³¹INa) used in the diagnosis and therapy of patients with thyrotoxicosis/hyperthyroidism. Disorders include Graves’ disease, toxic multinodular goiter, autonomous toxic nodules, and subacute thyroiditis. The ¹³¹INa therapeutic dosages and radiation safety guidelines will be reviewed.

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Results: NA

Conclusion: Learners will gain an understanding of the characteristics that make the radioiodines perfectly suited for evaluation and therapy of thyrotoxicosis/hyperthyroidism. After reviewing this exhibit, they will be better prepared to integrate functional uptake values with morphologic pinhole images across the spectrum of toxic disorders of the thyroid gland. Learners will understand how to prescribe appropriate therapeutic ¹³¹INa dosages. Research Support: NA