一种基于边缘检测的环状伪影定位算法

目的：提出一种基于边缘检测的环形伪影定位算法，以去除环形伪影。方法：通过含有Sobel算子边缘检测函数提取环形伪影边缘，再采用扫描线法和直线拟合法得到伪影圆的圆心和半径，定位出环形伪影在原始图像中的位置．最后采用线性插值算法对图像进行插值去除伪影。结果：该算法对于实验体模以及临床图像环形伪影去除的效果比较理想。结论：该算法快速有效，减少了运算量，有效地抑制了噪声，提高了环形伪影定位的速度和精度。

Ring Artifact Location Algorithm Based on Edge Detection

Objective To investigate the Ring Artifact Location Algorithm based on edge detection to eliminate the ring artifact, Methods The Sobel operator was used to extract the ring edge, and then an algorithm, which combined scan line searching with line fitting, was applied to determining the ring center and its size. Finally the linear interpolation algorithm was used to gel rid of the ring artifact. Results This method was very effective to eliminate the ring artifact of both phantom and clinical images.Conclusion This algorithm is faster and more effective than the usual one and its speed and accuracy are improved.