Slot scintillation detector modeling for digital radiography

A scanning slot X-ray digital detector operating at relatively high photon energies, mainly 70 kVp for dental radiography, has been designed and modeled. In this energy range, further improvements are required in order to attain optimal image quality for the lowest achievable mean absorbed dose to the patient. This paper concerns the investigation of the physics of imaging using a structured screen composed of a scintillating fiber optic (LKH-6/CCD system) and its performance by Monte Carlo (MC) simulation. The A_s factor, X-ray cross-talk, quantum noise effect on resultant values of Detective Quantum Efficiency (DQE) and Modulation Transfer Function (MTF) are discussed. The results of this paper should serve as a useful guide in the engineering design of future structured screen/CCD based systems.