Scintigraphy is a technique where radioisotope is injected intravenously.
A gamma camera is used to record uptake of the nucleotide in the tissues. It is particularly useful diagnostically to localize an area of inflammation in the musculoskeletal system.

The radioisotope introduced into the body reaches the target organ and emits gamma radiation ready to be captured by the gamma camera. This apparatus contains crystals of sodium iodide, which react to the gamma rays producing scintillation. Scintillation counters placed around the crystals transform the flashes into electronic signals. The signals are transmitted to a computer for analysis and elaboration of the image of the investigated organ.

The most common radioisotope used to image bones is technetium-99m.
The pharmaceutical product we used is PYROSCINT - TM. It is a sterile and apyretic substance in form of dehydrated powder, stored in nitric atmosphere.
After reconstruction with pertechnetate (Tc- 99m) in physiological solution, a diagnostical agent is obtained, to be administered intravenously.
Technetium pyrophosphate (Tc-99m) is used to produce images of skeleton and makes possible the examination of osteogenetic areas. The intravenous injection of tin pyrophosphate followed by the intravenous injection of pertechnetate (Tc-99m) enables us to mark the red blood cells with technetium 99m.

Technetium 99m turns into a stable form - Technetium 99 - through isomeric transition
in half life of 6.02 hours.

The basic characteristics of radioactive emissions of Technetium-99m:
- major radiation: gamma rays
- medium disintegration rate: 89,3%
- medium energy (MeV): 0.140