Strategies for Film Replacement in Radiography - a comparative study -

Strategies for Film Replacement in Radiography - a comparative study -
复制标题

放射线照相胶片更换策略 - 比较研究 -

DOI：
--
复制
发表时间：
2007
期刊：
影响因子：
--
通讯作者：
K. Bavendiek
K. Bavendiek
中科院分区：
--
文献类型：
--
作者：
U. Ewert;U. Zscherpel;K. Bavendiek

文献摘要

被引文献

相似文献

近10年来，NDT界一直在讨论计算机射线照相（CR）和数字探测器阵列（DDA）（也称为平板探测器）如何有效地替代胶片。2005年，CEN、ASTM和ASME发布了多项标准，以支持荧光成像板代替X射线胶片的应用。欧洲共同体资助了FilmFree项目，该项目支持从传统胶片放射学到数字放射学的节约变革。33家公司和研究所测试新技术的能力，并制定指导方针和标准。其中一个关键概念是使用信噪比（SNR）测量，相当于电影的光密度。将演示该程序。DDAs的应用尚未得到任何标准的支持，但正在讨论建议，以指导用户正确的资格和做法。一项比较研究介绍了用CR和DDA代替焊缝的薄膜的结果。正确的DDA校准的新策略产生了额外的普通增加的图像质量。对比敏感度提高了10倍，与胶片摄影。这是任何其他技术都无法实现的。数字射线照相技术目前受到材料颗粒结构的限制，而不是探测器的对比度噪声分布。甚至由探测器的单个像素尺寸引起的空间不清晰度的限制也可以通过增加的对比灵敏度来补偿。
The NDT community discusses about effective film replacement by Computed Radiography (CR) and Digital Detector Arrays (DDA), also known as flat panel detectors, since more than 10 years. Several standards were published by CEN, ASTM and ASME to support the application of phosphor imaging plates in lieu of X-ray film in the year 2005. The European Community funds the project FilmFree, which supports the save change from classical film radiography to digital radiology. Thirty three companies and institutes test the ability of the new technologies and develop guidelines and standards. One of the key concepts is the usage of signal-to-noise (SNR) measurements as equivalent to the optical density of film. The procedure will be demonstrated. The application of DDAs is not yet supported by any standard, but proposals are under discussion to guide the user for correct qualification and practice. A comparative study presents the results of film replacement by CR and DDAs for welds. New strategies for correct DDA calibration yield an extra ordinary increase of image quality. The contrast sensitivity was enhanced up to 10 times in relation to film radiography. This could not yet be achieved by any other technology. The digital radiographic technique is nowadays limited by the materials grain structure and not the detector contrast-to-noise distribution. Even restrictions in the spatial unsharpness provoked by the individual picture element size of the detector are compensated by the increased contrast sensitivity.