Thyroid radionuclide imaging

Thyroid radionuclide imaging tests are most commonly used to identify the nature, quantity and size of thyroid nodules. A dense nodule called a "hot nodule" often indicates that the nodule is a benign, high-functioning adenoma. Most thyroid cancers are "cold nodules." Thyroid imaging can determine the size, shape, and location of the thyroid gland (ectopic thyroid gland, sternal thyroid gland); identify the nature of the neck mass, look for metastases of thyroid cancer (cancer with 131I function); some sporadic Thyroid deficiency in cretinism; depending on the area and weight of the patient's thyroid, the number of surgical resections and the estimated dose of radioactive 131I can be determined; and the 131I can be used to treat the pre-thyroid thyroid gland, and the morphology of residual thyroid tissue can be observed. . Basic Information Specialist Category: Otolaryngology Classification: Radionuclide Applicable gender: whether men and women apply fasting: not fasting Analysis results: Below normal: Normal value: no Above normal: negative: normal Positive: 1. When the hyperthyroidism patient injects the imaging agent for 8-10 seconds, the thyroid is developed, its radioactivity is higher than that of the carotid artery, and the thyroid imaging is rapid and clear. 2, thyroid malignant tumors grow rapidly, so that the local blood flow of the nodules increased, in the static development of "hot nodules", mostly toxic thyroid adenoma, and the possibility of static development of "cold nodules" malignant tumors Big. Tips: Pay attention to rest before eating, reasonable diet and follow the doctor's advice. Normal value No hot and cold nodules appeared, and the blood flow of the thyroid or nodules was normal. Clinical significance Abnormal result In patients with hyperthyroidism, thyroid blood flow is significantly increased due to hypermetabolism. Therefore, when the hyperthyroidism patient is injected with the imaging agent for 8 to 10 seconds, the thyroid is developed, the radioactivity is higher than that of the carotid artery, and the thyroid imaging is rapid and clear. Thyroid malignant tumors grow rapidly, which increases the local blood flow of the nodules. In the static development of "hot nodules", most of them are toxic thyroid adenomas, and the static development is more likely to be a "cold nodule" malignant tumor. 1. The early clinical manifestations of thyroid cancer are not obvious. Patients or family members and doctors accidentally found a hard and uneven mass in the neck thyroid gland. There are no symptoms. The neck mass is often an asymmetric lumps. The thyroid nodule mass can gradually Increase, with swallowing up and down activities, and can be invaded by the trachea and fixed, the mass is easy to produce compression symptoms earlier, such as accompanied by hoarseness, poor breathing, difficulty swallowing, or local tenderness and other compression symptoms, when the jugular vein is compressed, Signs of venous engorgement and facial edema appear as one of the characteristics of thyroid cancer, such as lung metastasis and bone metastasis, and even pathological fractures, while the neck should be carefully examined for thyroid, and in the late stage, more hypothyroidism. 2. (1) benign thyroid tumors except for functional autonomic thyroid tumors, most of them see isolated nodules of the thyroid gland, and a few are multiple nodules. Most of them are single-shot, round or oval, with smooth surface, clear boundary, solid texture, no adhesion to surrounding tissues, no tenderness, and can move up and down with swallowing. Tumors are usually in the order of a few centimeters, which is rare. Large tumors can cause compression of adjacent organs, but do not invade these organs, such as compressing the trachea, causing the organs to shift. A small number of tumors due to intratumoral hemorrhage suddenly increased with local pain. (2) functional autonomic thyroid adenoma is more common in women, patients often have a long history of thyroid nodules, early asymptomatic or only mild palpitation, weight loss, fatigue, with the development of the disease, patients have varying degrees of performance Symptoms of thyroid poisoning, most patients with symptoms of hyperthyroidism, individual hyperthyroidism can occur. The people who need to be examined are as follows (1) ectopic thyroid diagnosis. (b) suspected bone, lung, or other soft tissue thyroid cancer metastases. (3) Judgment of thyroid function. (4) Differential diagnosis of intrathyroid and outsourcing blocks. (5) Determine the size of the thyroid and estimate the weight of the thyroid. (6) Understand the residual thyroid tissue regeneration after surgery. (7) Differential diagnosis of diffuse and nodular goiter. Precautions Contraindications before examination: The preparation of the patient before the scan is the same as the 131I functional test of the thyroid gland. Because the dose of radionuclide used for thyroid scanning is larger than that of the 131I functional test, the scan should be performed after all tests. If a scan has been performed, the 131I functional test should be performed 2 to 3 months after the scan. Requirements for inspection: Actively cooperate with the doctor's request. Inspection process If the thyroid is ingested with a certain developer (such as radioactive iodine or 99M sputum) and then the gamma-scanner camera is used to capture the distribution of the developer in the gland, the nodules of different properties have different ability to capture the developer. Therefore, the physician can identify the nature of the nodule development and guide the treatment. Not suitable for the crowd Inappropriate people: those who have been pregnant for more than 12 weeks and who are breast-feeding. Adverse reactions and risks Nothing.