Effects on spatial resolution of CT image caused by inaccurate angle localization

This paper discusses the negative effect on spatial resolution of computerized tomography (CT) image caused by the angle localization misalignment. Through the theoretic analysis based on "parallel projection" and "filtered back projection", point spreading function of the CT system with inaccurate angle localization is given, also, the estimate of spatial resolution under such condition is provided. The simulative image which is generated by Mathematica 5.0 agrees well with the estimate data, which has verified that such estimate of spatial resolution with inaccurate angle localization is valuable. The result also is providing theoretic reference for confining the precision of the angle coder in large CT system.