© Copyright 2026 American Medical Association. All rights reserved.
Absolute quantitation of myocardial blood flow using positron emission tomography (PET) is a diagnostic imaging procedure that provides critical insights into the heart's blood flow dynamics. This technique is particularly valuable in the assessment of coronary artery disease (CAD), including complex cases such as multi-vessel CAD. It also plays a significant role in evaluating the severity of microvascular disease, which affects the small blood vessels in the heart, as well as assessing endothelial dysfunction, a condition where the inner lining of blood vessels does not function normally. The procedure begins with the establishment of intravenous access, allowing for the administration of a radioactive tracer. The patient is then positioned within the PET scanner, where images of the heart muscle, or myocardium, are captured at rest. To further evaluate cardiac function, stress is induced either through physical exercise or the administration of a pharmacological agent that causes coronary vasodilation. Following this, a second injection of the tracer is administered, and additional images are obtained during the induced stress state. The resulting images are processed using specialized computer software, which generates a polar map that visually represents the perfusion levels of the coronary arteries and myocardial tissue. It is important to note that CPT® Code 0482T is reported separately in addition to the code for the primary procedure, reflecting the comprehensive nature of this diagnostic evaluation.
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