thallium 201

thallium 201
a radioactive isotope of thallium, atomic mass 201, having a half-life of 3.05 days; it decays by electron capture with emission of gamma rays (0.135, 0.167 MeV) and is used as a diagnostic aid in the form of thallous chloride (q.v.).

Medical dictionary. 2011.

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  • thallium-201 myocardial perfusion scintigraphy — the most common type of myocardial perfusion scintigraphy; the radionuclide used is thallium 201 in the form of thallous chloride. It is most frequently performed in conjunction with exercise stress tests in the diagnosis of coronary artery… …   Medical dictionary

  • Thallium — (pronEng|ˈθæliəm) is a chemical element with the symbol Tl and atomic number 81. [ [ thallium ] , Los Alamos National Laboratory. Retrieved November 21, 2006.] This soft gray malleable poor metal resembles …   Wikipedia

  • Thallium — Mercure ← Thallium → Plomb Indium …   Wikipédia en Français

  • THALLIUM — Du grec thallos , verdure. Symbole chimique: Tl Numéro atomique: 81 Masse atomique: 204,37 g Point de fusion: 303,5 0C Point d’ébullition: 1 457 0C Densité (à 20 0C): 11,85 Métal mou, facilement fusible, facilement oxydable dans l’air, découvert …   Encyclopédie Universelle

  • Thallium scan — A method of examining the heart to obtain information about the blood supply to the heart muscle. In the scan, special cameras take a series of pictures of the heart. Radioactive thallium is injected into the bloodstream and serves as a tracer.… …   Medical dictionary

  • thallium stress test — (for coronary artery disease) stress is placed on the cardiovascular system by exercising the patient on a treadmill or bicycle ergometer. Thallous chloride Tl 201 is injected intravenously when stress is maximal, just prior to exercise cessation …   Medical dictionary

  • thallium imaging — see thallium 201 myocardial perfusion scintigraphy, under scintigraphy and thallium stress test, under tests …   Medical dictionary

  • thallium scanning — see thallium 201 myocardial perfusion scintigraphy, under scintigraphy, and thallium stress test, under test …   Medical dictionary

  • thallium scan — a method of studying blood flow to the heart muscle (myocardium) and diagnosing myocardial ischaemia using an injection of the radioisotope thallium 201. Defects of perfusion, such as a recent infarct, emit little or no radioactivity and are seen …   The new mediacal dictionary

  • exercise thallium scintigraphy — thallium 201 scintigraphy performed in conjunction with an exercise stress test; see thallium stress test, under test …   Medical dictionary

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