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Reduced cardiac blood flow. Coloured single photon emission computed tomography (SPECT) scan of myocardial ischaemia (reduced blood flow to the myocardium, the heart muscle). The scan shows areas well-supplied with blood in red, with the surrounding colours (yellow, green, blue) showing decreasing amounts of blood supply. This is a axial (horizontal) section, where the wall of the heart would normally form a red ring. The gap at lower centre is where the reduced blood supply (ischaemia) has occurred. Ischaemia can be caused by blockages of the coronary arteries, and can lead to a heart attack. SPECT scanning uses the radioactive tracer technetium-99m (Tc-99m), which emits gamma ray photons, to examine the blood supply to organs like the brain and the heart.
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