目的 探讨核素显像对无痛性甲状腺炎的诊断价值。方法 对 20例正常者、45例Graves病和30例无痛性甲状腺炎患者进行放射性核素显像，同时测定血清甲状腺激素水平及摄131I率。结果 Graves病与无痛性甲状腺炎组FT3、FT4值均升高，TSH均降低，与正常对照组比较差异均有统计学意义；无痛性甲状腺炎组FT3、FT4水平较Graves病组低。无痛性甲状腺炎组甲状腺不显影，摄锝比值及摄碘率极低，与Graves病组比较有显著差异。而Graves病组甲状腺显影，甲状腺轮廓清晰。结论：甲状腺摄碘功能测定及甲状腺显像能较准确的反映甲状腺疾病的功能、受损的范围及程度，是诊断无痛性甲状腺炎有效的检查方法。

Objective To investigate the diagnostic value of radionuclide imaging in painless thyroiditis．Methods Radionuclide imaging were performed on 20 normal cases, 45 cases with Graves and 30 cases with painless thyroiditis, whose thyroid hormone and 131I-uptake rate test were determined. Results The serum FT3 and FT4 levels in two groups with thyroid disease were al1 significantly increased, whereas the serum TSH level was significantly decreased than those in the control group. The serum FT3 and FT4 level in painless thyroiditis group were lower than those in Graves disease group. Non-visulization of thyroid scintigraphy was observed in painless thyroiditis group. Absorption ratio of 99mTc and 131I in painless thyroiditis group were very low compared with Graves disease group. Thyroid could be well visualized by thyroid scintigraphy in Graves disease group. Conclusion Radioiodine uptake ratio and thyroid scintigraphy may reflect the function and damage scale of the thyroid. It may be an effective method to diagnose painless thyroiditis.