Title :
Effects on spatial resolution of CT image caused by nonstationary axis
Author :
Wang, Yun-xiao ; Wang, Xin ; Guo, Xiao-Xin ; Pang, Yun-Jie ; Wang, Zheng-Xuan ; Chai, Sheng
Author_Institution :
Coll. of Comput. Sci. & Technol., Jilin Univ., Changchun, China
Abstract :
This paper discusses the negative effect on spatial resolution of computerized tomography (CT) image caused by the stochastic iso-center misalignment. Through the theoretic analysis based on "parallel projection" and "filtered back projection", point spreading function of the CT system with nonstationary axis 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 nonstationary axis is valuable. The result also is providing theoretic reference for confining the radial deviation of the rotating axis in large CT system.
Keywords :
computerised tomography; image resolution; medical image processing; optical transfer function; stochastic processes; Mathematica 5.0; computerized tomography image; filtered back projection; nonstationary axis; parallel projection; point spreading function; radial deviation; rotating axis; spatial resolution; stochastic isocenter misalignment; Computed tomography; Computer science; Detectors; Educational institutions; Image analysis; Image reconstruction; Image sampling; Mechanical variables measurement; Rotation measurement; Spatial resolution; Computerized tomography (CT); point spreading function (PSF); spatial resolution;
Conference_Titel :
Machine Learning and Cybernetics, 2005. Proceedings of 2005 International Conference on
Conference_Location :
Guangzhou, China
Print_ISBN :
0-7803-9091-1
DOI :
10.1109/ICMLC.2005.1527911
