Extraosseous activity How is a three-phase bone scan different from a standard bone scan? How is the standard bone scan performed? List six causes of single or multiple focal areas of decreased osseous uptake (cold lesions). List six causes of single or multiple focal areas of increased osseous uptake (hot lesions). Tracer uptake is normally seen in what locations? What are the causes of a superscan? What are the primary uses of bone scans? What factors affect the uptake of the MDP tracer? What is a superscan? What is the underlying principle of bone scanning? What term is used to describe this appearance above on a bone scan? Why are some tumors cold on bone scan (no detectable radiotracer uptake)? Book traversal links for Bone Scans ‹ Nuclear Medicine Up Extraosseous activity ›