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Bone scan

A bone scan is a nuclear medicine (scintigraphic) study that makes use of Technetium 99m (commonly Tc99m-methylene diphosphonate (MDP)) as the active agent. 

The study has three stages which follow intravenous injection of the tracer.

Clinical indications

  • malignancy : detection and follow-up of skeletal metastases
  • detection of radiographically occult fractures
  • osteomyelitis
  • reflex sympathetic dystrophy
  • hip joint prosthesis : evaluation for infection or loosening

Patient preparation

  • hydration
  • remove metal objects
  • void immediately before study

Tracer dose and route of administration

Tc99m diphosphonate is administered intravenously, at a dose of 20 mCi. 

The phases

Flow phase
  • 2 to 5-sec images are obtained for 60 seconds after injection
  • demonstrates perfusion and characterises the blood flow to a particular area
Blood pool phase
  • the blood-pool image is obtained 5 min after injection
  • demonstrated the blood pool, not the blood flow
  • inflammation causes capillary dilatation and increased blood flow

If the study is going to be a triphasic bone scan, a third phase is added.

Delayed phase
  • the bone image is obtained 2 - 4 hours later
  • urinary excretion has decreased the amount of the radionuclide in soft tissue

See also

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