MEASUREMENT OF THE RATE OF THYROID UPTAKE~( 99m) TcO_4

Objective To study the method of measuring the rate of thyroid uptake 99m TcO 4 and the relationship between thyroid uptake 99m TcO 4 rate and thyroid uptake 131 I rate, “diet”,FT 3 and FT 4 concentrations in serum. Methods 52 subjects received thyroid dynamic image for 30 minutes with SPECT and the rates of thyroid uptake 99m TcO 4 were calculated in different periods of the time. Of 52 subjects, the rates of thyroid uptake 131 I in 25 subjects on a diet for 16-30 days were measured. The concentrations of FT 3 and FT 4 in serum were determined in all 52 subjects and other 32 persons. Results After injecting radionuclide into the veins, the rate of thyroid uptake 99m TcO 4 ascended rapidly within the first 10 minutes and slowed obviously after the 10 minutes. The rate of tyhroid uptake 99m TcO 4 was positively correlated with FT 3 and FT 4. The rates of tyhroid uptake 99m TcO 4 descended in some extent in the subjects who were not on a diet. Conclusion The method of thyroid dynamic image with measuring the rates of thyroid uptake 99m TcO 4 within and after 10 minutes can well represent thyroid function, and it is simple, practical and valuable. [