Positron Emission Tomography (PET) Scan
A Positron Emission Tomography (PET) scan is an imaging test using a radioactive tracer to visualize metabolic activity in tissues, commonly detecting cancer, heart disease, and brain disorders by revealing function rather than just anatomy.
What is a Positron Emission Tomography (PET) Scan?
A Positron Emission Tomography (PET) Scan is an imaging test that uses a small amount of radioactive tracer to reveal metabolic activity within tissues. As the tracer accumulates in areas of high cellular activity, a scanner detects the emitted signals and builds images showing how tissues are functioning.
Unlike imaging that primarily depicts anatomy, a PET scan shows physiological processes, often combined with CT for precise anatomical localization. This functional view can highlight disease before structural changes are visible.
Why is a PET Scan clinically important?
PET scans are widely used to detect and stage cancer, evaluate certain heart conditions, and assess brain disorders, because they reveal abnormal metabolic activity that other imaging may miss. This makes them valuable for diagnosis, treatment planning, and monitoring response to therapy.
By distinguishing active disease from inactive or scar tissue, PET imaging can guide major clinical decisions. Its ability to show function rather than form alone gives clinicians information that meaningfully changes management.
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