Abstract
<ns3:p>Objective. The goal of the work is to develop methods of calibrating the positron emission tomography system built from plastic scintillators, and to present results of the modular J-PET scanner calibration.Methods. Measurements with radionuclide 22Na and 44Sc (used as a point-like source and enclosed in a collimator) were performed using the modular J-PET scanner, and the data were analysed with a dedicated software framework. The detection modules were synchronised using signals from annihilation photons and prompt gamma.Results. The application of the time calibration methods yields a fully synchronised detector. Time-of-Flight resolution for modular J-PET is determined to be about 490 ps (FWHM). Conclusions. J-PET scanner built from plastic scintillators can be calibrated using β+γ emitters and taking advantage of the fact that the direction of propagation of annihilation and prompt photons are not correlated.</ns3:p>