基于动态时间弯曲的X射线变电流投影融合方法

发布时间：2018-05-13 17:01

本文选题：计算机断层成像 + 几何尺寸测量　；参考：《光子学报》2017年01期

【摘要】：针对变电流投影融合中的阈值选择问题,提出了一种基于动态时间弯曲的变电流投影融合方法.该方法首先计算不同电流下投影的灰度值-有效边缘梯度序列,然后利用动态时间弯曲距离对预处理后的序列进行相似匹配,自动判断最佳融合阈值,最后根据阈值确定不同电流投影的子区域并对其进行融合,实现了探测器动态范围的扩展.本文方法计算的各角度下融合阈值的平均误差仅为2.26%,能够避免人工选择融合阈值的主观性,基于融合后重建图像的信噪比与几何尺寸测量准确度均优于固定融合阈值的方法.
[Abstract]:To solve the problem of threshold selection in variable current projection fusion, a method of variable current projection fusion based on dynamic time bending is proposed. The method first calculates the gray value of the projection under different currents-the effective edge gradient sequence, then uses the dynamic time bending distance to match the pretreated sequence, and automatically judges the best fusion threshold. Finally, the sub-regions of different current projection are determined and fused according to the threshold value, and the dynamic range of the detector is extended. The average error of fusion threshold calculated by this method is only 2.26, which can avoid the subjectivity of artificial selection of fusion threshold. The SNR and geometric dimension measurement accuracy of reconstructed image based on fusion is better than that of fixed fusion threshold.
【作者单位】：国家数字交换系统工程技术研究中心;中国人民解放军95807部队;
【基金】：国家自然科学基金(Nos.61372172,61601518)资助~~
【分类号】：O434.1

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