The radioactive iodine uptake test , or the RAIU test , is the type of scan used in the diagnosis of thyroid problems, especially hyperthyroidism. This is entirely different from radioactive iodine therapy (RAI therapy), which uses a much higher dose to destroy cancer cells. The RAIU test is also used as a follow up to RAI therapy to verify that no surviving thyroid cells, which can still become cancerous.
Patients swallow iodine radioisotope in capsule or liquid form, and the absorption (absorption) of this radiotracer by the thyroid is studied after 4-6 hours and after 24 hours with the help of luster counters. The dose is usually 0.15-0.37 MBq (4-10? Ci) of 131 I sodium iodide, or 3.7-7.4 MBq (100-200? Ci) from 123 I sodium iodide.
Normal taking is between 15 and 25 percent, but this can be forced down if, in the meantime, patients have been eating high iodine foods, such as dairy products and seafood. Low uptake shows thyroiditis, high uptake indicates Graves' disease, and inactivity in the taking indicates the presence of nodules.
123 I have half-life shorter than 131 I (half day vs. 8.1 days), so use 123 I describe the content to reduce radiation , at the expense of less time to evaluate the pending scan image. Next, 123 I emit gamma radiation, while 131 I emit gamma and beta radiation.
Video Radioactive iodine uptake test
Contraindications
This test is not suitable for patients who are pregnant or breastfeeding.
Maps Radioactive iodine uptake test
Additional images
References
Source of the article : Wikipedia
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