光栅相衬CT中吸收信号环形伪影的去除方法

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光栅相衬CT中吸收信号环形伪影的去除方法

杜天宇; 高昆; 吴朝

量子电子学报, 2023, Volume: 40, Issue: 1

Journal Article

O434.19; 提出一种光栅X射线相衬断层扫描中吸收信号环形伪影的去除方法.该方法采用正弦图域和重建图域结合的处理算法.对于弱伪影,通过正弦图域的排序和滤波去除.而对于强伪影,首先根据环形伪影在极坐标系的表现,计算残差图像,转换到笛卡尔坐标系得到伪影像素和样品的边界;进而使用基于机器学习的图像分割方法获取每一类样品的分布,同时为了保护边界信息,通过形态学操作获得样本的内部区域;最后再利用残差图像的分布特征定位伪影像素,并使用临近非伪影像素均值替代.实验结果表明该方法可以在不破坏样品边界的前提下有效地去除图像中的环形伪影.

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杜天宇 | 高昆 | 吴朝

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