1/7 Positron Emission Particle Tracking (PEPT) To Study Flow and Mixing in Twin Screw Extrusion 2/7 Positron Emission Particle Tracking Tracer particle labelled with Positron Emitting Isotope generates thousands of pairs of collinear gamma photons per second Detection of successive pairs gives tracer location (after removal of scattered photons) 3/7 Siemens ECAT PET Scanners (951 and 931) ADAC Forte PET Scanner The Positron Imaging Centre University of Birmingham 4/7 The Modular Camera Dismantled ECAT camera 5/7 Modular camera installed on Modified Leistritz 27mm TSE Screw Elements in FOV 6/7 Single particle trajectories shown simultaneously 7/7 For More Information Visit: Contact: Dr Roy Huzzard Smithers Rapra Technology Ltd Shawbury Shropshire SY4 4NR Tel: +44 (0)