Objective To investigate the radionuclide 99m TcO 4 imaging parameters of thyroid in hyperthyroid patients. Methods 200 patients with hyperthyroidism including 153 women and 47 men received radionuclide 99m TcO 4 plane scintigraphy for thyroid. Then the size and anatomic configuration of thyroid, tracer distribution, and the pyramid lobe appearance were analyzed.Results 400 images of thyroid lobes were obtained from 200 patients. The length of single thyroid lobe in 169 patients were between 5cm and 7cm, in 33 patients exceeded 7cm, and in 38 patients was less than 5cm. The width of single thyroid lobe in 144 patients were between 2.5cm and 3.5cm, in 6 patients exceeded 3.5cm, and in 85 patients ware less than 3.5cm. 61% of patients had the widened narrow part of thyroid. The tracer evenly distributed in most patients, and small multinodular thyroid and single nodular thyroid were found only in 9.0% and 3.2% patients respectively. Pyramid lobe appeared in 12 patients.Conclusion SPECT imaging paremeters of the thyroids in hyperthyroid patients mainly were a diffuse goiter with the widened narrow part of thyroid and without nodule and pyramid lobe.

0 05).Conclusions Double phase 99 Tc m-MIBI imaging is a promising technique for localization of parathyroid adenomas. We consider that the patients should undergo the noninvasive imaging procedures before their initial neck exploration.