1.1 本规程涵盖了特殊材料或工艺的放射检查，或两者兼而有之的放射检查 E747型 和 2025年 可能不足以控制放射线图像的质量和可重复性。 1.2 在适当的情况下，代表性图像质量指标（RQI）也可以代表接受或拒绝不连续图像的标准水平。 1.3 本规程适用于大多数放射检查方法。 1.4 本标准并不旨在解决与其使用相关的所有安全问题（如有）。本标准的使用者有责任在使用前建立适当的安全、健康和环境实践，并确定监管限制的适用性。 1.5 本国际标准是根据世界贸易组织技术性贸易壁垒（TBT）委员会发布的《国际标准、指南和建议制定原则决定》中确立的国际公认标准化原则制定的。 =====意义和用途====== 5.1 RQI的使用与工业放射学中的常规做法有很大不同，因为它不是标准设计，取决于应用、材料和工艺，因此不能是简单的斑块或金属丝。RQI的使用提供了有文件证明的证据，即放射学图像具有必要的质量水平，通过确保感兴趣区域的足够空间分辨率和对比度灵敏度来揭示正在检查的零件的不符合项。 5.2 如果常规IQI符合规程 E747型 或 2025年 可以有效使用，应遵循这些做法。

1.1 This practice covers the radiological examination of unique materials or processes, or both, for which conventionally designed image quality indicators (IQIs), such as those described in Practices E747 and E1025 , may be inadequate in controlling the quality and repeatability of the radiological image. 1.2 Where appropriate, representative image quality indicators (RQIs) may also represent criteria levels of the acceptance or rejection of images of discontinuities. 1.3 This practice is applicable to most radiological methods of examination. 1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. ====== Significance And Use ====== 5.1 The use of RQIs is a significant departure from normal practice in industrial radiology because it is not a standard design and is dependent on the application, material, and process and therefore cannot be a simple plaque or wire. The use of an RQI provides documented evidence that radiologic images have the level of quality necessary to reveal those nonconformances for which the parts are being examined by ensuring adequate spatial resolution and contrast sensitivity in the areas of interest. 5.2 Where conventional IQIs conforming to Practice E747 or E1025 can be used effectively, those practices should be followed.