SIMON FRASER / MEDICAL PHYSICS, RVI, NEWCASTLE UPON-TYNE / SCIENCE PHOTO LIBRARY SIMON FRASER / MEDICAL PHYSICS, RVI, NEWCASTLE UPON-TYNE / SCIENCE PHOTO LIBRARY
False-colour scintigram (bone scan) of a normal chest in posterior view. The scintigram is a map of radioactivity from a tracer, which is injected into the subject prior to taking the scan & which becomes concentrated in bone. Radioactivity passes through the body to be recorded by an external gamma camera. Technetium-99m linked to MDP is the tracer of choice for bone scans. This technique is used to screen cancer patients for secondary disease (metastases) in the follow-up to treatment of their primary cancer. The increased uptake of radioactivity in cancerous bone is revealed as abnormal, "hot spots" on a bone scan.
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