Measured and simulated specifications of Lausanne ClearPET scanner demonstrator

This paper presents the measurements obtained with the partial ring Lausanne ClearPET scanner demonstrator and compares them against GATE Monte Carlo simulations. Radial and tangential spatial resolutions were measured up to 4 cm from the scanner axis. FWHM spatial resolutions range from 1.3 mm on axis to 2.6 mm at 4 cm from the axis. Excellent agreement is observed between the measured and simulated spatial resolutions. Coincidence time resolution of the LSO/LuYAP detector modules amounts to 4.8 ns FWHM. Absolute sensitivity measured for two detector modules facing each other amounts to 0.068%, compared to 0.070% simulated for 7.1 g/cc LuYAP with 70% lutetium atomic fraction. Simulation of a 4-ring ClearPET scanner with 20 LSO/LuYAP detector modules per ring gives an absolute sensitivity of 4.42%. DOI effect is shown on a reconstructed image of a Mini-Derenzo phantom. Images of a [/sup 18/F]FDG rat brain scan are presented.