Molecular Imaging 2017

Detection of 511 keV photons

Scintillation detectors • Inorganic crystal that emits visible light photons after interaction of photons with detector. • Number of scintillation photons is proportional to the energy deposited in the crystal. – NaI(Tl): sodium iodide doped with thallium – BGO: bismuth germanate (Bi4Ge3O12) – LSO: lutetium oxyorthosilicate doped with cerium(Lu2SiO5:Ce)

Photomultiplyer tubes (PMTs) • Incoming photons from scintillation blocks are converted into electrical signal