Wing artifact correction of CT images based on sinogram
AIM: To correct the ring artifact in CT images using sinogram data. METHODS: Three steps were taken in the correction: First, median filtering was used to preprocess projection sonogram data. Second, the vertical line artifacts in the sinogram were removed using edge function of Sobel operator to mark the edge of sonogram. Third, Hough transform function was used to find the position of ring artifact. The third step also used linear interpolation to interpolate the ring artifact data. Computer simulation procedures were used to verify the methods. RESULTS: The correction algorithm for ring artifact was effective. CONCLUSION : Hough transform can be used to detect a ring artifact in sinogram , but a number of parameters need to be further adjusted to optimize the results for particular data sets.
NETL
NSTL
万方数据
维普
