Inclusion Criteria:  Men or women between the ages of 18 and 75 Clinical diagnosis of autoimmune thyroiditis, serum TPOAb and TGAB positive Thyroid function is normal, and no drugs affecting thyroid function such as Umetole and Serge have been used  Exclusion Criteria:  The contraindications indicated in the Chinese instructions of the drug Hypothyroidism, hyperthyroidism Liver function impairment Renal function impairment Claustrophobia Mental disorders