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FRINATEK-Fri prosj.st. mat.,naturv.,tek

A Novel PET Detector with 3D Event Reconstruction and MRI Compatibility

Tildelt: kr 7,5 mill.

In PET imaging today there is a constant demand for improved resolution, efficiency, timing and image contrast. Real progress calls for new approaches and developments within PET instrumentation. In this proposal we describe the concept of a novel 3D axia l geometry with excellent 3-dimensional spatial, timing and energy resolution. This allows for a new way of measuring the interaction point in the detector with very high precision in three dimensions. It is based on a matrix of long LYSO crystals oriente d in the axial direction, each coupled to one G-APD array. To derive the axial coordinate, WLS strips are mounted orthogonally and are interleaved between the crystals. The light from the WLS strips is also read by G-APDs. The weighted mean of the WLS str ips has proven to give very precise axial resolution. Achievable resolution along the three axis is driven by the dimension of the LYSO and WLS. This concept is inherently free of parallax error. Furthermore, it will allow identification of all Compton in teractions and reconstruction of a fraction of Compton cascades in the detector, which is expected to enhance image quality and sensitivity. The combination of LYSO, WLS, G-APD and electronics with continuous sampling ADCs have been demonstrated in a lab setup to show very promising characteristics for a lager scale PET system. To integrate this as a larger scale prototype it is proposed to build a system consisting of two detector blocks were each block will consist of a matrix of 6×6 LYSO crystals. Eac h block will be assembled using 100mm×3mm×3mm LYSO, 0.9mm×3mm×40mm WLS and 3mm×3mm and 1mm×3mm G-APDs for LYSO and WLS readout respectively. This will demonstrate full 3D readout of the interaction point and give a voxel resolution close to 10mm3 and an e nergy resolution for 511keV of 14% FWHM. This will all be assembled in to MRI compatible mechanics.

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FRINATEK-Fri prosj.st. mat.,naturv.,tek