Especially in the edge extraction, the speckle noise makes none of the conventional extraction algorithms get good result. 特别是对于边缘提取，斑点噪声使得传统的提取算法几乎都无法取得理想的效果。
Combined with pattern matching, this new method could increase the precision of transferring the result of edge extraction from one slice to another. 结合匹配技术，提高边缘提取结果层间传递的精度。
