Bone scans
Definition
Technetium 99m labelled MDP (Mono - diphosphonate)
Advantages
1. Pure gamma emitter
2. Half life only 6 hours
- limits radiation exposure
3. Localises in bone
- chemical interaction on the surface of the hydroxyapatite crystal of bone
- phosphorous component interacts with the endogenous calcium
- produces insoluble technetium calcium phosphate complexes.