Bone Scan

• A tracer, or bone–seeking nuclide, is injected into a vein.
• The tracer emits gamma radiation, which is detected by the scanner.
• When the tracer has collected in the bones (about 2 to 4 hours) after the injection, the scan is performed.
• The distribution of gamma rays is recorded by the scanner, and the information is recorded in a computer.
• The image then appears on the computer screen.
• Normal or even distribution areas appear gray.
• “Hot spots” are areas where there is an increased absorption of the tracer; these appear dark. “Cold spots” are areas where there is less absorption of the tracer.
• These appear light. The scanning part of the test will last about 1 hour and may require changing to various positions.
• You must remove dentures, jewelry or other metal objects.
• You will have to wear a hospital gown.
• There is a bit of pain when the needle is inserted.
• Later the injection site may be tender to the touch.
• You must remain still during the scan, and you will be instructed when to change positions.

• Detecting areas of abnormal bone metabolism.
• Lesions.
• Fractures.
• Degenerative disorders.
• Cancer.
• Infection.

• If the patient is pregnant or nursing a baby, the test may be postponed to decrease the chance of affecting the baby.
• A person with a hypersensitive reaction may develop a rash, swelling, or other allergic side effects.

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