This examination mainly uses 99mTcO4 as imaging agent, intravenous shot or injection of 4 ~ 5mci, and gamma camera continuously takes pictures every 2 seconds, and * * * collects 6 frames as blood flow phase, and then makes thyroid static imaging 2 minutes later. Through the dynamic imaging of thyroid radionuclide, the local blood perfusion of thyroid or nodule can be observed, and combined with the static imaging of thyroid, the function of thyroid or the nature of nodule can be understood
Thyroid radionuclide blood flow imaging is mainly used for the diagnosis of hyperthyroidism and the differentiation of thyroid nodules. Hyperthyroidism patients, due to hypermetabolism, lead to an obvious increase in thyroid blood flow. Therefore, when hyperthyroidism patients inject imaging agent for 8 ~ 1 seconds, the thyroid develops, and its radioactivity is higher than that of carotid artery shadow, and thyroid imaging is rapid and clear. The rapid growth of thyroid malignant tumors increases the local blood flow of nodules. Those who are statically developed as "hot nodules" are mostly toxic thyroid adenomas, while those who are statically developed as "cold nodules" are more likely to have malignant tumors.