LYCOS RETRIEVER 
Radionuclide
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Radionuclide imaging is a technique that uses the introduction of tiny amounts of radioactive materials into a patient's body in order to obtain images. The technique allows physicians to obtain very detailed images of different organs in the body, including the heart. Radionuclide imaging ... provides information about tissues, blood flow and chemical changes in the body.
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Radionuclide cystography (RNC) is a method to evaluate for vesicoureteral reflux, which results in significantly less gonadal radiation when compared with conventional radiographic technique (voiding cystourethrogram [VCUG]). In addition, radionuclide cystography has a sensitivity for detection of vesicoureteral reflux equal to that of VCUG. Radionuclide cystography does not provide the same anatomic detail as a VCUG.
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Radionuclide bone imaging is often used to differentiate tibial stress fractures from shin splints (Fig 15). Hyperperfusion and hyperemia are typically present in acute stress fracture. Delayed images demonstrate focal fusiform uptake in the lesion; this uptake often occurs at the junction of the middle and distal thirds of the tibia (25). Shin splints are due to excessive exertion of the tibialis and soleus muscles of the legs, which gives rise to periostitis at the tibial insertions of these muscles. Unlike in stress fractures, angiograms and blood pool images are usually normal in shin splints. Delayed bone images reveal longitudinally oriented linear areas of increased uptake of varying intensity that involve one-third or more of the posterior tibial cortex (26).
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Radionuclide generators contain a parent isotope that decays to produce a radioisotope. The parent is usually produced in a nuclear reactor. A typical example is the technetium-99m generator used in nuclear medicine. The parent produced in the reactor is molybdenum-99.
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Radionuclide angiography can ... be used as a nuclear brain scan. In it radioactive compounds are injected into a vein in the arm, and a machine similar to a Geiger counter creates a map showing their uptake into different parts of the head. The pictures show how the brain functions rather than its structure. This test can detect blocked blood vessels and areas where the brain is damaged.
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Radionuclide imaging is a nuclear medicine technique that allows physicians to obtain clear images of various parts of the body. Tiny amounts of radioactive materials (called “tracersâ€) are injected into the patient’s body. The tracers emit a type of energy called gamma rays, which are detected by special devices.
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