Practical Guide of Digital Radiography Technology (Ⅲ): Image Quality Evaluation for Digital Radiography Technology
摘 要
在现今的射线检测技术中,作为新生代的数字成像技术与传统的胶片照相相比,由于各自组成的核心部件——数字探测器和胶片具有不同的特点,使得数字成像与胶片照相存在很大的区别,特别是在影响像质因素和像质表征参数方面的区别更加突出。文章旨在通过分析两者的区别,引出数字成像像质的评价指标:对比度和分辨率。通过分析评价指标,强调分辨率的重要性,以引起检测人员的关注,避免单方面要求提高对比度,而减小分辨率,出现细微缺陷的漏检,产生质量隐患。
Abstract
As a new X-ray inspecting technology, the digital radiography is seriously different from film radiography due to the difference between the digital detector and film. As a result, the image qualities of these technologies have more differences, especially in the influence factors and representation parameters. This paper analyzes the difference between digital radiography and film radiography, advances image quality evaluation parameters for digital radiography technology, i.e. contrast and resolution, and especially emphasizes importance of resolution for inspector to avoid undetected small defect by excessively heightening contrast and reducing resolution.
中图分类号 TG115.28
所属栏目 数字射线检测实用指导
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收稿日期 2011/4/28
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备注梁丽红(1966-),女,高工,主要从事无损检测新技术、新方法、新工艺的研究和系统研制。
引用该论文: LIANG Li-Hong. Practical Guide of Digital Radiography Technology (Ⅲ): Image Quality Evaluation for Digital Radiography Technology[J]. Nondestructive Testing, 2012, 34(6): 44~46
梁丽红. 数字射线检测实用指导(三)——射线数字成像的像质评价[J]. 无损检测, 2012, 34(6): 44~46
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参考文献
【1】NB/T 4730.11承压设备无损检测第11部分X射线数字成像检测[S].
【2】梁丽红.非晶硅平板探测器工业射线成像特性研究[D].北京:北京航空航天大学,2005.
【3】Partridge M, Hesse B M, Muller L. A performance comparison of direct-and indirect-detection flat-panel imagers[J]. Nuclear Instruments and Methods in Physics Research A,2002(484):351-363.
【4】Que W, Rowland J A. X-ray imaging using amorphous selenium: Inherent spatial resolution[J]. Med Phys,1995,22(4):365-374.
【5】EN 462- 5: 1996Non-Destructive Testing-Image Quality of Radiographs Part 5. Image Quality Indicators (Duplex Wire Type), Determination of Image Unsharpness Values[S].
【2】梁丽红.非晶硅平板探测器工业射线成像特性研究[D].北京:北京航空航天大学,2005.
【3】Partridge M, Hesse B M, Muller L. A performance comparison of direct-and indirect-detection flat-panel imagers[J]. Nuclear Instruments and Methods in Physics Research A,2002(484):351-363.
【4】Que W, Rowland J A. X-ray imaging using amorphous selenium: Inherent spatial resolution[J]. Med Phys,1995,22(4):365-374.
【5】EN 462- 5: 1996Non-Destructive Testing-Image Quality of Radiographs Part 5. Image Quality Indicators (Duplex Wire Type), Determination of Image Unsharpness Values[S].
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