Radiotracer + gamma
For a nuclear thyroid scan
, you are administered a radiotracer either by mouth (typical for radioiodine) or IV (for tc99m pertechnetate).
Some time is allowed to pass in order to let the thyroid take up the radiotracer. Your thyroid is then imaged using a gamma camera. For a pertechnetate study, it takes about an hour. For a radioiodine study, it may take a couple of days to allow adequate uptake.