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Related to technetium-99m: metastable


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 oxime

Abbreviation: 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.
References in periodicals archive ?
Technetium-99m was obtained as pertechnetate by elution of Ultra-TechneKow generator (Mallinckrodt) with sterile 0.9% sodium chloride (Mallinckrodt, The Netherlands).
Technetium-99m is the most commonly used medical radioisotope for imaging and scanning of various internal organs such as the brain, lungs, kidneys, liver and thyroid as well as bone for diagnostic purposes.
However, the effect of the level of exercise on the accuracy of technetium-99m methoxy-isobutyl-isonitrile ([sup.99m]Tc-MIBI) imaging has not been widely studied and controversial results exist (3,8-21).
The two most common imaging modalities for preoperative planning are ultrasonography and dual-phase technetium-99m ([sup.99m]Tc) sestamibi multiplex ion-beam imaging (MIBI) parathyroid scintigraphy.
Sequential technetium-99m HMDP-gallium-67 citrate imaging for the evaluation of infection in the painful prosthesis.
A technetium-99m (Tc-99m) MPI planar projection image of the chest reveals a large circular area of increased uptake in the left axilla (Figure 1).
The total radiation dose used is less than for a 1-day stress-rest scan using technetium-99m sestamibi.
Called technetium-99m sestamibi, the imaging "dye" consists of a radioactive tracer (technetium-99m) bound to a heart-seeking chemical (sestamibi).
The diagnosis was based on three criteria: (1) a severe, painful inflammation of the external auditory canal accompanied by exudate, edema, and granulation tissue; (2) a protracted course of at least 3 weeks during which time the patient did not respond to topical and/or systemic antibiotic therapy; and (3) evidence of bony erosion on computed tomography (CT) of the temporal bone or a positive finding on technetium-99m ([sup.99m]Tc) methylene diphosphonate scintigraphy of the temporal bone.
Technetium-99m (Tc-99m) sestamibi and Tc-99m tetrofosmin are commonly utilized tracers for dual-phase parathyroid scintigraphy.

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