Abstract: Perfusion CT is a functional imaging technique that can provide physiological and metabolic information.Since then,CT perfusion imaging in early diagnosis of brain ischemic lesions,brain and body neoplastic lesions and differential diagnosis of clinical research were used more often,and have achieved good results.Diagnosis and Differential Diagnosis of thyroid nodules in CT perfusion imaging is still at the primary stage.The related literature are little.Thyroid nodules on CT perfusion studies are reviewed as follows.