OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY OUELLETTE & THEROUX, PUBLIPHOTO DIFFUSION / SCIENCE PHOTO LIBRARY
Healthy heart muscle. Coloured SPECT (single photon emission computed tomography) scans of the heart showing blood flow from the ventricles. Transverse "slices" show systole (top left) and diastole (upper & lower right) heart contractions; where blood is pumped out of the ventricle and drawn into the atrium respectively. A white line is drawn over the left ventricle & blood flow rate is indicated by the coloured bar beside each scan (red=high, blue=low). A frontal section is seen at lower left. Blood flow is measured by injecting the patient with a radioactive tracer (technetium- 99m) and scanning using a gamma camera.
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