Skip to main content
Fig. 4 | EJNMMI Physics

Fig. 4

From: Physics of pure and non-pure positron emitters for PET: a review and a discussion

Fig. 4

Additional mechanisms associated with spurious coincidences: a high-energy positrons, escaping the patient skin, can travel in air and reach the PET scanner internal tunnel, where they annihilate and produce two 511-keV gammas in coincidence; b in LSO- or LYSO-based PET scanners, a small background of 176Lu radiation can generate coincidences between β in a detector and two photons (307 keV + 202 keV) in another; and c high-energy Bremsstrahlung X-rays can be emitted by slowing down of high-energy β or β+ and create e +/e pairs in the detectors

Back to article page