2.Abnormal Static images
(1)abnormal of morphology :irregular or incomplete ,could be seen in multinodular goiter and congenital absence of one lobe(Fig6).
The second part
Imaging agents and their futrers, imaging methods
Imaging agents and their characteristics
Iodine-131(131I):
❖ Long physical half-life(8.04d) ❖ β-rays occupy 90%,r-rays only occupy 10% of its emission ❖ The energy of principal r-ray is high(364 Kev) ❖ A relatively high irradiation dose to the thyroid and whole-body ❖ Easily obtained and with lower cost ❖ Mainly be used for detecting ectopic thyroid tissue and
➢ To a nodule in thyroid, if its radioactivity is higher or its image is shown earlier than the normal part, it indicates that the nodule may be autonomous hyperfunction adenoma or malignant disease. And on conversely, may be benign disease.(Fig16,17,18)
