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PET technology: current trends and future developments

¹ INSERM U650, Laboratoire de Traitement de l'Information Medicale (LATIM), CHU Morvan, 5 avenue Foch, 29609 Brest, France, ² Department of Nuclear Medicine, University Hospital Brest, Brest, France and ³ Northern Ireland Regional Medical Physics Agency, Royal Victoria Hospital, Belfast, UK

View larger version (5K): [in a new window]   Figure 1. (a) A true coincidence through the detection (1) of two 511 keV photons (3) resulting from an annihilation (2) between an atomic electron and a positron emitted by the injected radiopharmaceutical; (b) a scattered coincidence with at least one of the two annihilation photons undergoing Compton scatter interaction(s) prior to their detection; (c) a random coincidence registered through the detection of two annihilation photons that have originated from two different sites of annihilation.

View larger version (14K): [in a new window]   Figure 2. (a) 2D operation (septa in the field of view) allows coincidences between crystals of the same or adjacent rings, while in (b) 3D mode the septa are removed increasing the axial acceptance angle by allowing the detection of coincidences between nearly all detector rings.