In general CT imaging systems

due to no light isolation among the pixels of flat-panel detectors

more dispersion

less dynamic range and lower imaging parameters consist in imaging process compared with linear detectors.Big-size detectors is adopted to recombine the pixels

and recompose and compensate data by sub-pixel high-resolution approach.The method makes up the deficiency of dynamic range of flat panel detectors

and better CT reconstructed results can be obtained due to high space resolution of the flat panel.