CNRI / SCIENCE PHOTO LIBRARY CNRI / SCIENCE PHOTO LIBRARY
False-colour scintigram (gamma camera scan) of the human heart obtained during diastole, the period between two successive contractions when the heart's chambers (atria & ventricles) fill with blood. The heart appears in centre - the red, pink & white region at bottom right represents the left ventricle filled with blood. Colour-coding represents the amount of radiation recorded by the gamma camera from blood cells labelled with the radio-isotope, technetium-99m, injected intra- venously into the subject prior to taking the scan.
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