SPECT is based on the conventional

SPECT is based on the conventional nuclear imaging technique and tomographic reconstruction methods.The most important tool in nuclear medicine is the scintillation camera (anger camera) based on a large area (~40 cm in diameter) NaI(Tl) crystal.When a photon hits and interact with the crystal, the scintillation generated and detected by the area of PMTs. An electronic circuit evaluates the relative signals from the PMTs and determines the location of the signal.The conventional nuclear medicine imaging process.Typical radionuclides used are 140 KeV Tc-99m and 70 KeV photons from Tl-201.