Artifact reduction in non-destructive testing by means of complementary data fusion of x-ray computed tomography and ultrasonic pulse-echo testing
Artifact reduction in non-destructive testing by means of complementary data fusion of x-ray computed tomography and ultrasonic pulse-echo testing
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DOI：
10.1088/0957-0233/24/12/125403
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发表时间：
2013-12
影响因子：
2.4
通讯作者：
M. Schrapp;T. Scharrer;M. Goldammer;S. Rupitsch;A. Sutor;H. Ermert;R. Lerch
中科院分区：
文献类型：
--
作者：
M. Schrapp;T. Scharrer;M. Goldammer;S. Rupitsch;A. Sutor;H. Ermert;R. Lerch
在工业无损检测中，X射线计算机层析成像(CT)和超声脉冲回波检测在大尺度样品的研究中发挥着重要的作用。一种主要的伪影出现在CT中，当特定方向的X射线吸收太强时，导致材料不能完全穿透。由于不同的物理相互作用原理，超声成像能够显示CT图像中看不到的特征。在这一贡献中，我们提出了一种新的融合由X射线CT和超声检测提供的互补数据的方法。超声数据通过自适应合成孔径聚焦技术(SAFT)获得，并补充了CT图像中缺失的边缘信息。随后，将完整的边缘图作为先验信息合并到改进的同时迭代重建方法(SIRT)中，并允许显著减少CT图像中的伪影。
In industrial non-destructive testing, x-ray computed tomography (CT) and ultrasonic pulse-echo testing play an important role in the investigation of large-scale samples. One major artifact arises in CT, when the x-ray absorption in specific directions is too intense, so that the material cannot be fully penetrated. Due to different physical interaction principles, ultrasonic imaging is able to show features which are not visible in the CT image. In this contribution, we present a novel fusion method for the complementary data provided by x-ray CT and ultrasonic testing. The ultrasonic data are obtained by an adapted synthetic aperture focusing technique (SAFT) and complement the missing edge information in the CT image. Subsequently, the full edge map is incorporated as a priori information in a modified simultaneous iterative reconstruction method (SIRT) and allows a significant reduction of artifacts in the CT image.