WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY WILL & DENI MCINTYRE / SCIENCE PHOTO LIBRARY
Heart blood flow. Doctor analysing coloured SPECT (single photon emission computed tomography) scans of a patient's heart. SPECT scanning is used to diagnose a type of heart disease called ischaemia, where the heart's muscles receive an inadequate flow of blood. The flow is measured by injecting the patient with a radioactive tracer. This concentrates in the heart's muscle & is scanned using a gamma camera.
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