Nuclear imaging studies use extremely low doses of a radioactive “tracer” drug, injected beforehand, to follow the flow of blood through the heart. A special camera detects the tracers, allowing diagnosticians to pinpoint blockages in the coronary arteries, locate problems with the heart wall (myocardial perfusion studies), or see if heart chambers are functioning efficiently (cardiac function tests). This type of imaging may be done as part of an exercise or stress test to see how the flow changes when the heart is working harder. We perform MUGA (multiple gated acquisition) and PET (positron emission tomography) scans, as well as stress tests using different tracers such as thallium and Tc-99m sestamibi.
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