What is a NM thyroid scan pertechnetate?
Tc-99m pertechnetate thyroid scan is a functional nuclear medicine study used to assess the thyroid gland. The uptake of the pertechnetate anion – similar in chemical-physical characteristics to the iodide ion – in the thyroid parenchyma is mediated by the NIS (Sodium-Iodide Symporter).
How is TC 99 scan done?
For a bone scan, the patient is injected with a small amount of radioactive material, such as 700–1,100 MBq (19–30 mCi) of 99mTc-medronic acid and then scanned with a gamma camera.
When should a thyroid scan be done?
The thyroid scan is used to determine the size, shape and position of the thyroid gland. The thyroid uptake is performed to evaluate the function of the gland. A whole-body thyroid scan is typically performed on people who have or had thyroid cancer.
What is the difference between technetium-99m and technetium 99?
Technetium-99 is produced during nuclear reactor operation, and is a byproduct of nuclear weapons explosions. Technetium-99m is a short-lived form of Tc-99 that is used as a medical diagnostic tool. It has a short half-life (6 hours) and does not remain in the body or the environment for long.
What is the role of technetium 99?
Technetium-99m (99mTc) is a radionuclide nuclear agent that is FDA approved for diagnostic imaging of the brain, bone, lungs, kidneys, thyroid, heart, gall bladder, liver, spleen, bone marrow, salivary and lachrymal glands, blood pool, and sentinel nodes.
Where does MO 99 come from?
Mo-99 is produced in the uranium-bearing targets by irradiating them with thermal neutrons. Some of the U-235 nuclei absorb these neutrons, which can cause them to fission. The fission of the U-235 nucleus produces two but sometimes three lower-mass nuclei referred to as fission fragments.
Is thyroid scan harmful?
There’s a small but safe amount of radiation contained in the radionuclide used in any thyroid scan. Your exposure to radiation will be minimal and within the acceptable ranges for diagnostic exams. There are no known long-term complications of having a nuclear medicine procedure.
Why is technetium used in medical diagnosis?
Technetium-99m is used to image the skeleton and heart muscle in particular, but also for brain, thyroid, lungs, liver, spleen, kidney, gall bladder, bone marrow, salivary and lachrymal glands, heart blood pool, infection and numerous specialized medical studies.
Comment fonctionne la scintigraphie thyroïdienne?
A l’aide de la scintigraphie thyroïdienne, on peut ainsi visualiser des régions de la thyroïde qui captent moins le traceur (hypofixations appelées nodules froids) ou qui captent plus le traceur (hyperfixations appelées nodules chauds). La prise de données dure quelques minutes.
Quelle est la fonction de la thyroïde?
La thyroïde est une glande située à la base du cou, produisant des hormones indispensables au bon fonctionnement de l’organisme. Des anomalies, structurelles ou fonctionnelles, peuvent entraîner un dysfonctionnement de la thyroïde et conduire à une surproduction ( hyperthyroïdie) ou une sous-production d’hormones ( hypothyroïdie ).
Quel est le produit de la scintigraphie?
Toute scintigraphie nécessite l’ injection d’un produit faiblement radioactif, que l’on appelle également radio-traceur ou radio-pharmaceutique ; ce produit présente la particularité de se fixer préférentiellement sur les cellules hyperactives de l’organe examiné et d’émettre des signaux (rayons gamma).
