The study of reconstruction image quality resulting from geometric error in micro-CT system

The reconstruction images often suffer from artifacts caused by misaligned geometry of flat detector in micro-CT. This paper mainly simulates the causality between the reconstruction image quality and the flat detector geometry by the eight-spheres phantom. The simulation results show that the most influential parameter is beta (the rotation angle of the detector plane along the center point O) among the five detector parameters, next is a, b, theta and a degressively. We should control a under 7 degrees and a, b offset lower than 8 pixels, when adjusting micro-CT systems. We also show that the relevant correction is efficient to improve the reconstruction image quality affected by the tiny geometric error.