The influence of energy weighting on X-ray imaging quality

Recent developments in radiation imaging detectors offer a perspective towards energy sensitive X-ray pixel detectors. Such spectroscopic pixel detectors would provide energy information in addition to the spatial information. One way to use this additional energy information is to weight each photon by an energy dependent factor. Under stringent assumptions we can show how this energy weighting has to be performed to achieve maximum image quality. In order to visualise the impact of the weighting technique on the image quality we have simulated three radiologic cases with the EGS4-based Monte Carlo Roentgen Simulation ROSI (Nucl. Instr. and Meth. A 509 (2003) 151; www.pi4.physik.uni-erlangen.de/Giersch/ROSI).