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In nuclear medicine, medical professionals inject a tiny amount of a radioisotope-a chemical element that produces radiation-into a patient's body. A specific organ picks up the radioisotope, enabling a special camera to take a detailed picture of how that organ is functioning. For example:

  • Myocardial perfusion imaging maps the blood flow to the heart, allowing doctors to see whether a patient has Heart disease and determine the most effective course of treatment.
  • Bone scans can detect the spread of cancer six to 18 months earlier than X-rays.
  • Kidney scans are much more sensitive than X-rays or ultrasounds in fully evaluating kidney function.
  • Imaging with radioactive technetium-99 can help diagnose bone infections at the earliest possible stage.

These kinds of diagnostic procedures involve very small amounts of radioisotopes. In higher doses, radioisotopes also help treat disease. For example, radioactive iodine's widespread use in therapy for thyroid cancer results in a lower recurrence rate than drug therapy. It also avoids potentially fatal side effects, such as the destruction of bone marrow.

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