Technetium-99m
Technetium-99m - Related Videos
10:54
Preparation and Evaluation of 99mTc-labeled Tridentate Chelates for Pre-targeting Using Bioorthogonal Chemistry
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Cited by 7 •
2017
Here, we describe a protocol for radiolabeling and in vivo testing of tridentate 99mTc(I) chelate-tetrazine derivatives for pre-targeting and bioorthogonal chemistry.
07:52
In Vivo Imaging and Tracking of Technetium-99m Labeled Bone Marrow Mesenchymal Stem Cells in Equine Tendinopathy
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Cited by 17 •
2015
This protocol describes the radiolabeling of equine mesenchymal stem cells and their implantation into tendon injuries in the horse in order to determine cell survival and tissue distribution using gamma scintigraphy.
09:08
Combined SPECT and CT Imaging to Visualize Cardiac Functionality
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2023
Source: Alycia G. Berman, James A. Schaber, and Craig J. Goergen, Weldon School of Biomedical Engineering, Purdue University, West Lafayette, Indiana Here we will demonstrate the fundamentals of single-photon emission computed tomography/computed tomography (SPECT/CT) imaging using mice. The technique involves injecting a radionuclide into a mouse, imaging the animal after it is distributed throughout the body, and then reconstructing the produced images to create a volumetric dataset. This can...
03:18
Radioactivity and Nuclear Equations
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2020
Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element. A nuclide of an element has a specific number of protons and...
09:52
Isolated Hepatic Perfusion as a Treatment for Liver Metastases of Uveal Melanoma
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Cited by 23 •
2015
Here, we present a protocol how to perform an isolated liver perfusion (IHP) with melphalan and we also discuss IHP as a treatment option for liver metastases of uveal melanoma.
FAQs
The approximately six-hour half-life provides enough time to prepare a radiopharmaceutical, administer it, and acquire images while limiting how long the radioactive source remains in the patient. This balance supports practical clinical workflows and helps produce detectable signals without relying on a long-lived imaging source. Its decay timing is therefore central to both scheduling and radiation management.
Molybdenum-99 generators provide a practical source of Technetium-99m for nuclear medicine services. This generator-based supply makes the radionuclide available when needed rather than requiring every imaging facility to obtain it as a continuously prepared standalone material. Generator availability, combined with the isotope’s short half-life, contributes to its widespread role in routine diagnostic imaging.
Technetium-99m can be chemically attached to radiopharmaceuticals designed to concentrate in particular tissues or organs. The attached compound influences where the radioactive signal accumulates, while the technetium provides the detectable gamma emissions. This separation of targeting and detection allows different preparations to support evaluations of bone turnover, blood flow, cardiac function, or organ structure.
Gamma cameras detect the photons emitted as Technetium-99m decays and use their distribution to form images. Planar imaging produces views of radiotracer distribution, whereas single-photon emission computed tomography acquires information for tomographic images. These approaches allow clinicians to examine where a radiopharmaceutical has concentrated and assess functional or structural patterns in the relevant anatomy.
A typical study requires obtaining Technetium-99m from a molybdenum-99 generator, attaching it to an appropriate radiopharmaceutical, and administering the resulting preparation so it can concentrate in the intended tissue or organ. A gamma camera then records the emitted photons using planar imaging or single-photon emission computed tomography, producing the study used for clinical assessment.
The method supports several types of diagnostic assessment rather than a single organ-specific examination. Depending on the radiopharmaceutical and imaging approach, clinicians can evaluate blood flow, bone turnover, cardiac function, and organ structure. This breadth explains why Technetium-99m remains central to nuclear medicine and why its chemistry is important for matching imaging studies to clinical needs.