technetium-99m

technetium-99m
A radioisotope of technetium that decays by isomeric transition, emitting an essentially monoenergetic gamma ray of 142 keV with a half-life of 6.01 hr. It is usually obtained from a radionuclide generator of molybdenum-99 and is used to prepare radiopharmaceuticals for scanning the brain, parotid, thyroid, lungs, blood pool, liver, heart, spleen, kidney, lacrimal drainage apparatus, bone, and bone marrow.
- 99mTc diphosphonate a radionuclide complex used for bone scans.
- 99mTc-DTPA a radionuclide chelate complex used for renal imaging and function testing; also known as 99mTc pentatate. [diethylene triamine pentaacetic acid]
- 99mTc sestamibi a lipophilic cationic complex of a 99mTc-labeled isonitrite, used as a radionuclide in several organs (e.g., brain, bone, thyroid, breast) for the detection of cancer, or in the heart for identifying coronary artery occlusion. It has superseded Tl-201 in cardiac imaging and in experimental breast imaging.

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n.
an isotope of the artificial radioactive element technetium. It emits gamma radiation only, with no beta particles, at a convenient energy for detection by a gamma camera and has a short half-life. For these reasons it is widely used in nuclear medicine as a tracer for the examination of many organs (see scintigram). Symbol: Tc-99m.

Medical dictionary. 2011.

Look at other dictionaries:

  • Technetium-99m — is a metastable nuclear isomer of technetium 99, symbolized as 99mTc. The m indicates that this is a metastable nuclear isomer, i.e. it does not change into another element (transmutate) upon its decay . It is a gamma ray emitting isotope used in …   Wikipedia

  • Technétium 99m — Hotte permettant l extraction et la mise en seringue du 99mTc Le technétium 99m, noté 99mTc, est un isomère nucléaire de l isotope du technétium dont le nombre de masse est égal à 99 : son noyau atomique compte 43 protons et 56 neutrons avec …   Wikipédia en Français

  • technetium-99m — n. an isotope of the artificial radioactive element technetium. It emits gamma radiation only, with no beta particles, at a convenient energy for detection by a gamma camera and has a short half life. For these reasons it is widely used in… …   The new mediacal dictionary

  • technetium 99m — a metastable isotope of technetium, atomic mass 99, having a half life of 6.01 hours; it decays by isomeric transition emitting gamma rays (0.141 MeV), and is the most commonly used radionuclide in nuclear medicine …   Medical dictionary

  • Technetium-99m-Generator — Fünf Technetium 99m Generatoren …   Deutsch Wikipedia

  • Technetium-99m Generator — Schematische Darstellung eines Nuklidgenerators Ausbeute eines Technetium 99m Generators gegen die Zeit Ein …   Deutsch Wikipedia

  • Technetium-99m generator — Five Technetium 99m Generators A technetium 99m generator, or colloquially a technetium cow or moly cow, is a device used to extract the metastable isotope 99mTc of technetium from a source of decaying molybdenum 99. 99Mo has a half life of 66… …   Wikipedia

  • technetium 99m pertechnetate — the ionic form of technetium 99m, TcO4−, having a variety of uses as an imaging agent (see table) and in the preparation of other 99mTc radiopharmaceuticals …   Medical dictionary

  • Technetium — Technétium Technétium Molyb …   Wikipédia en Français

  • Technétium — Molybdène ← Technétium → Ruthénium Mn …   Wikipédia en Français

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