Edge Response and Defect Detectability in Flat Panel Digital Radiography

IF 0.5 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Materials Evaluation Pub Date : 2024-05-01 DOI:10.32548/2024.me-04372

Srivathasan S, Sanjoy Das, M. Ravindra, D. Mukherjee

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Abstract

Defect detectability studies are used in nondestructive testing to ascertain the reliability of the method of inspection. In digital radiography, with the growing prevalence of automation of quality control processes by image processing and machine learning, a threshold detection criterion based on quantifiable data from the digital radiograph could be explored. The use of the parameter contrast-to-noise ratio (CNR) of defect signal as a probability of detection (POD) threshold criterion is explored in this paper. A stainless steel block containing artificial defects of known dimensions and location is radiographed by a flat panel detector, and an empirical POD curve is constructed. Before the POD study, the edge response of the flat panel system is studied to ensure noninterference of adjacent defect signals, gain insights about the lateral spread of the defect signal, and provide information to choose the region of interest for CNR calculation. The effect of noise on the POD using CNR as the threshold criterion is also included in the present study. The use of CNR-based POD models for digital radiography to aid the comparison and development of automatic defect detection models is also discussed.

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平板数字射线摄影中的边缘响应和缺陷可探测性

缺陷可探测性研究用于无损检测，以确定检测方法的可靠性。在数字射线摄影中，随着通过图像处理和机器学习实现质量控制流程自动化的日益普及，可以探索一种基于数字射线照片可量化数据的阈值检测标准。本文探讨了使用缺陷信号的对比度-噪声比（CNR）参数作为检测概率（POD）阈值标准。使用平板探测器对含有已知尺寸和位置的人造缺陷的不锈钢块进行射线照相，并构建经验 POD 曲线。在研究 POD 之前，先研究平板系统的边缘响应，以确保相邻缺陷信号互不干扰，深入了解缺陷信号的横向扩散情况，并为选择 CNR 计算的相关区域提供信息。本研究还包括噪声对使用 CNR 作为阈值标准的 POD 的影响。本研究还讨论了在数字射线摄影中使用基于 CNR 的 POD 模型来帮助比较和开发自动缺陷检测模型的问题。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Evaluation 工程技术-材料科学：表征与测试

CiteScore

0.90

自引率

16.70%

发文量

审稿时长

6-12 weeks

期刊介绍： Materials Evaluation publishes articles, news and features intended to increase the NDT practitioner’s knowledge of the science and technology involved in the field, bringing informative articles to the NDT public while highlighting the ongoing efforts of ASNT to fulfill its mission. M.E. is a peer-reviewed journal, relying on technicians and researchers to help grow and educate its members by providing relevant, cutting-edge and exclusive content containing technical details and discussions. The only periodical of its kind, M.E. is circulated to members and nonmember paid subscribers. The magazine is truly international in scope, with readers in over 90 nations. The journal’s history and archive reaches back to the earliest formative days of the Society.