technetium-99m(redirected from Tc-99m)
the radionuclide most commonly used to image the body in nuclear medicine scans. It is preferred because of its short half-life and because the emitted photon has an appropriate energy for normal imaging techniques. The "m" indicates that this radionuclide is metastable. It is generated on site from a molybdenum source.
A radioactive isotope of technetium having a half-life of 6 hr, in which the “m” refers to the fact that it is a metastable isotope.. 99mTc is used in nuclear medicine for a wide variety of diagnostic tests and imaging studies, e.g., myocardial perfusion scans, bone scans, and V/Q scans..
technetium Tc 99m albumin aggregated injection
An injection of technetium-99m that has been aggregated with albumin. It is used intravenously to scan the lungs.
technetium Tc 99m hexamethylpropyleneamine oximeAbbreviation: HMPAO
A radioactive tracer consisting of technetium-99m linked to hexamethylpropyleneamine oxime. It is used to make nuclear imaging scans of the brain, e.g., in the determination of brain death. Absence of uptake of the molecule by the brain is diagnostic of brain death.
technetium 99m (methoxyisonitrile) MIBI
A radioactive tracer consisting of technetium-99m linked to MIBI. It is used in nuclear medical imaging (e.g., in scintimammography) to identify cancerous breast masses. Other uses of technetium 99m MIBI include cardiac, parathyroid, and thyroid imaging.
technetium Tc 99m methylene diphosphonate
A radioactive tracer consisting of technetium-99m linked to methylene diphosphonate. It is used in nuclear medicine to obtain images of bone and bone diseases, e.g., fractures not seen on plain x-rays, malignancies, and osteomyelitis.
technetium Tc 99m RBC
A radioactive tracer consisting of technetium-99m linked to red blood cells. It is used in clinical medicine to evaluate occult bleeding, e.g., from the gastrointestinal tract, or the motion of the heart in gated blood pool imaging.Synonym: red blood cell scan
technetium Tc 99m sestamibi
A radioactive tracer consisting of technetium-99m linked to sestamibi. It is used to image blood flow to the heart muscle, esp. when combined with exercise or pharmacological “stress” tests. In a heart with normal blood flow, the isotope should be taken up uniformly throughout the heart muscle. Decreased uptake by regions of the heart occurs when coronary artery blood flow to those regions is blocked, e.g., by atherosclerotic plaque. Synonym: sestamibi
technetium Tc 99m sulfur colloid
A radioactive tracer consisting of technetium-99m linked to sulfur colloid. It is used in nuclear medicine scans to make images of gastric emptying or of the lymph nodes, liver, and spleen.
a chemical element, atomic number 43, atomic weight 99, symbol Tc. See Table 6.
the most frequently used radioisotope in nuclear medicine, a gamma emitter having a half-life of 6.04 hours and a primary photon energy of 140 keV; symbol 99mTc.
Tc sulfur coated scintiscan see scintiscan.