复合扫描计算机分层成像研究
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TP391 TH74

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2022 年国家自然科学基金(62171067)、2022 年国家重点研发计划项目(2022YFF0706400)资助


Research on the hybrid scanning computed laminography
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    摘要:

    针对薄板类工件成像,计算机分层成像(CL)技术因无损、直观而应用广泛。 CL 成像方法主要分为直线扫描和圆周扫 描, 直线扫描效率高, 圆周扫描数据均匀性好。 然而, 由于两者的投影数据均不完备, 均存在分层图像混叠及图像边缘不清 晰的问题。 基于此,提出了一种复合扫描 CL(HyCL)成像方法, 由直线扫描和圆周扫描组成。 建立了几何模型, 采用同时迭代 重建图像(SIRT)算法进行了仿真及成像实验, 分析了成像效果及层间混叠表现。 实验结果表明, 相比于相对平行直线移动扫 描 CL(PTCL)、正交直线移动扫描 CL(OTCL)及圆周扫描 CL(RCL), HyCL 的重建结果能够有效减少混叠伪影, 图像特征轮廓 信息能够保留得较为清晰且均匀, 对比度更好。

    Abstract:

    For the imaging of plate-like objects, the computed laminography ( CL) technology has been widely used because of its nondestructive and intuitive characteristics. CL imaging methods are mainly divided into linear scanning and circular scanning. Linear scanning has high efficiency, and circular scanning has good data uniformity. However, due to the incomplete projection data of both methods, there are problems of sliced image aliasing and unclear image edge. In this article, a hybrid scanning CL (HyCL) imaging method is proposed, which consists of linear scanning and circular scanning. The geometric model is formulated, the simulation and imaging experiments are implemented by using SIRT image reconstruction algorithm, the imaging effect and in-slice aliasing is analyzed. Compared with parallel translation computed laminography ( PTCL), orthogonal translation computed laminography ( OTCL) and rotational computed laminography (RCL), results show that HyCL can effectively reduce aliasing artifacts and protect details. The image contour can be retained clearly and evenly, and the contrast is better.

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周鹏伍,席雅睿,朱国荣,袁 伟,刘丰林.复合扫描计算机分层成像研究[J].仪器仪表学报,2022,43(12):178-187

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  • 在线发布日期: 2023-07-04
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