Thyroid static imaging

Static thyroid imaging uses the ability of the thyroid tissue to take up and concentrate 131I or 99mTc-perrhenate. After the thyroid has taken radioactive iodine or thorium from the blood circulation, the distribution of imaging agents in the thyroid is displayed in vitro by imaging equipment, which is used to observe the position, shape, size, and functional status of the thyroid. Radon and iodine belong to the same family and can be taken up and concentrated by thyroid tissues, but radon cannot be organicated. Therefore, 99mTcO4-thyroid imaging can only reflect the thyroid uptake function and cannot reflect the status of iodine metabolism or organic conditions. 99mTc has better physical properties than 131I and its image quality is better than 131I. It is currently the most commonly used thyroid imaging agent. However, when looking for metastatic foci of ectopic thyroid and thyroid cancer, 131I is still better.