Study on interpolation technology in image reconstruction based on analytic method

To provide choice basis for interpolation methods of image reconstruction,the quality influence of linear interpolation and spline interpolation to image reconstruction is studied.Usual interpolation technology is analyzed.Then the performances of linear interpolation and spline interpolation is analyzed from the angle of one dimensional interpolation and from two sides of theory and experiment.Finally the two methods is applied to image reconstruction based on filtered back projection algorithm and the two methods'influence on the reconstructed image's quality is analyzed in the circumstances of different sample interval of projections.The result demonstrates that spline interpolation's accuracy is relative high for one dimensional interpolation,but comparatively accurate spline interpolation can decrease the reconstructed image's quality for image reconstruction.It is pointed finally that linear interpolation method should be adopted in image reconstruction for it can reduced surge noise.