Design of intergrated radiation detectors with a-Si photodiodes on ceramic scintillators for use in x-ray computed tomography

An integrated radiation detector with a-Si photodiodes on ceramic scintillators is designed for use in x-ray computed tomography. The output signal is estimated using Monte Carlo simulation. Results show that this detector has higher sensitivity than a c-Si photodiode/scintillator detector when a transparent layer between the scintillator and the thin film semiconductor is optimized. The noise characteristic is also considered when an integrated detector is coupled with an operational amplifier. Good agreement is shown between predicted and measured parameters