Precision Manufacture And Decoding Test Of A Novel Medical Whole-body Pet Detector

High-performance ? photon detector is the core of medical whole-body PET system, detector for ? photons' effective detection is the premise of high-quality functional imaging. We design a novel block detector with grid frame crystal array and grease optical layer. Trial-manufactured detector modules get a g reat decoding result that peak-valley index of floodmap profile comes to 5.23 and energy resolution is 34% better than the PQS detector.Commonly used detectors are designed by “Discrete crystal array + Grid optical glass + PMT array” with indirect coupling of crystal and PMT array. Therefore the light output efficiency of detector is not good and manufacture process is more complex. Aiming at the shortcomings of conventional detector,we present an improved design that grease optical layer is used and crystal array is clamped by grid frame with high reflective rate surface. Precision manufacturing of grid frame crystal array is the key to achieve improved design, we assemble the grid frame in the way of SOGS(Staggered Orthogonal Grid Splicing)with metal slices that ESR pasted on the surface, and slices have dozes of seams for assembling. With optimization design of seams and the assembly dimensions between them,we get a regular grid frame with high-reflective rate surface. Then we manufactured a number of different crystal arrays with different sizes,and performed a lot effective contrast decoding experiment with grease optical layer used. Results show that the performance of novel design PET detector has improved significantly, compared to the similar detector it has higher light output efficiency,energy resolution and uniform decoding. The feasibility and superiority of novel block detector with grid frame crystal array and liquid optical layer has been proved.