technetium 99m

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a chemical element, atomic number 43, atomic weight 99, symbol Tc. (See Appendix 6.)
technetium 99m the most frequently used radioisotope in nuclear medicine, a gamma emitter having a half-life of 6.01 hours.

tech·ne·ti·um 99m (99mTc),

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 hours. 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.
References in periodicals archive ?
The facility is responsible for supplying more than half of the molybdenum 99 for technetium 99m generation in North America.
The study was presented in a poster at the meeting, and included 302 patients referred for clinically indicated rest-stress myocardial perfusion imaging (MPI) with technetium 99m sestamibi.
(25) Radionuclide examination with technetium 99m detected bone involvement in six of these patients.
Food and Drug Administration today approved a new use for Lymphoseek (technetium 99m tilmanocept) Injection, a radioactive diagnostic imaging agent used to help doctors determine the extent a type of cancer called squamous cell carcinoma has spread in the body s head and neck region.
Technetium 99m based myocardial perfusion imaging predicts clinical outcome in the community outpatient setting: The nuclear utility in the community ('NUC') study.