Laminography in the lab: imaging planar objects using a conventional x-ray CT scanner
Laminography in the lab: imaging planar objects using a conventional x-ray CT scanner
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DOI：
10.1088/1361-6501/aafcae
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发表时间：
2019-03-01
影响因子：
2.4
通讯作者：
Withers, P. J.
中科院分区：
文献类型：
--
作者：
Fisher, S. L.;Holmes, D. J.;Withers, P. J.
虽然X射线微计算机断层扫描（CT）机器已经发展成为用于材料的非破坏性3D成像的流行实验室工具，但是它们并不非常适合于扫描需求不断增加的平面物体。计算机分层成像（CL）技术已被开发用于成像平面样品，如化石，绘画，印刷电路板和复合板。本文是第一个工作演示如何CL可以实现在传统的工业实验室微型CT扫描仪，而不需要专业设备。成功地实施了旋转CL扫描配置（也称为倾斜或倾斜CT），并使用共轭梯度最小二乘法（CGLS）重建投影图像。计算机模拟被用来分析锥束CL重建中所见的图像伪影的原因，并为它们设计校正。由此产生的实验室CL方法产生重建较少的文物和更各向同性的分辨率相比，有限角度的扫描配置，否则用于平面样本。这表明CL可以在实验室中进行，而无需标准CT5所需的专业设备。
Whilst x-ray micro-computed tomography (CT) machines have developed into a popular laboratory tool for non-destructive 3D imaging of materials, they are not well-suited for scanning flat objects, for which there is an increasing demand. Computed laminography (CL) techniques have been developed for imaging planar samples such as fossils, paintings, printed circuit boards and composite panels. This paper is the first work demonstrating how CL may be implemented on a conventional industrial laboratory micro-CT scanner, without the need for specialist equipment. A rotary CL scan configuration (also known as tilted or oblique CT) was successfully implemented, and the projection images reconstructed using the conjugate gradient least squares (CGLS) method. Computer simulations were used to analyse the causes of image artefacts seen in the cone-beam CL reconstructions, and to devise corrections for them. The resulting laboratory CL method produces reconstructions with fewer artefacts and a more isotropic resolution compared to limited-angle scan configurations otherwise used for planar samples. This demonstrates that CL can be performed in the laboratory without specialist equipment beyond that required for standard CT5.