ISM / SCIENCE PHOTO LIBRARY ISM / SCIENCE PHOTO LIBRARY
Heart attack. Coloured single photon emission computed tomography (SPECT) scan of axial (horizontal) slices at various levels in the heart during a heart attack (myocardial infarction). The scan shows areas well-supplied with blood in green, with the surrounding colours (yellow, red) showing decreasing amounts of blood supply. The row of scans across centre would normally show the wall of the heart forming a green ring. The gap is where part of the heart muscle is dying due to lack of blood. This is usually caused by fatty deposits or a blood clot blocking the coronary arteries. 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.
Model release not required. Property release not required.