Abstract: ［Abstract］Objective〖HTSS〗〓To investigate the changes of the shear wave velocities（SWV） of thyroid tissues among patients with Graves disease(GD)and Hashimoto's thyroiditis(HT) by using Shear Wave velocity.
〖HTH〗〖WTHZ〗Methods〖HTSS〗〓 Fortyfive cases who were diagnosed with initial GD and 37 cases who were diagnosed HT and 50 healthy volunteers as control group were included in the study. The fasting blood samples were taken from every case in the morning，the thyroid function and related antibody were detected. SWV of thyroid tissues was measured by the same doctor. SWV was compared between GD group，HT group and control group. The correlation between thyrotropin，thyroid stimulating hormone(TSH)， free triiodothyronine(FT3)， free thyroxine(FT4) levels and SWV was analyzed.
〖HTH〗〖WTHZ〗Results〖HTSS〗〓Thyroid artery flow velocity in GD group is higher than the HT group, the difference was statistically significant（P＜005）. But there was no statistical difference in color flow grade(P＞005). Thyroid volumes of cases in GD group were significantly higher than those of cases in HT and control group（P＜005）. SWV values in GD and HT group are higher than the control group(P＜005). No correlation was detected between thyroid function and SWV value in GD and HT group(P＞005).
〖HTH〗〖WTHZ〗Conclusion〖HTSS〗〓SWE imaging can be objective and quantitative assessment thyroid tissue, but it is difficult to distinguish patients with GD and HT. Marked increased volume and the flow in upper thyroid artery both play a certain value in differential GD and HT.

Key words: goiter； thyroiditis, thyrotropin； ultrasonography