Physics-based modeling of X-ray CT measurements with energy-integrating detectors

摘要: Computer simulation tools for X-ray CT are important research efforts in developing reconstructionmethods, designing new architectures, and improving source detector technologies. In this paper, we propose a physics-based modeling method measurements with energy-integrating detectors. It accurately accounts the dependence characteristics on energy, depth spatial location of detection process, which is either ignored or over simplified most existing methods. Compared methods based Monte Carlo simulations, it is computationally much more efficient due to use look-up table optical collection efficiency. To model CT measurments, proposed considers five separate effects: energy- location-dependent absorption incident X-rays, conversion absorbed X-rays into photons emitted by scintillator, location-dependent collection photons, quantumefficiency converting fromoptical electrons, electronic noise. We evaluated comparing noise levels reconstructed images from measured data and simulations GE LightSpeed VCT system. Using results 20 cm water phantom 35 polyethylene (PE) disk at various tube voltages (kVp) currents (mA), demonstrated that produces realistic simulations. The difference standard deviation between approximately 2% 10% PE phantom.