1.1 本规程涵盖用于工业射线照相的数字检测器阵列（DDA）系统的基线和定期性能评估。其目的是确保图像质量的评估（只要受到DDA系统的影响）满足用户及其客户的需求，并使过程控制能够监测DDA系统长期稳定性。 1.2 本规程规定了要测量的数字检测器阵列系统的基本参数，以确定基线性能，并跟踪数字检测器阵列的长期稳定性。 1.3 本规程中规定的DDA系统测试应在制造商验收系统后完成，以确定DDA性能的基线。然后，应使用定期性能测试来监测系统的长期稳定性，以确定由于系统退化超过特定定义水平而需要采取的行动。 1.4 两种类型的模型，双面板和五槽楔，用于本文规定的测试。使用这两种类型的体模并不排除使用其他体模配置。如果本文规定的测试或模型不充分或不合适，用户可以与公认的工程组织（CEO）协调，开发额外或修改的测试、测试对象、模型或图像质量指标，以评估DDA系统性能。这些备选测试方法的验收水平应由用户和首席执行官协商确定。 1.5 本规程的用户应考虑高于450的能量 keV可能需要不同的测试方法或对此处描述的测试方法进行修改。这种做法不适用于同位素。 1.6 本标准并非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制定适当的安全、健康和环境实践，并确定监管限制的适用性。 1.7 本国际标准是根据世界贸易组织技术性贸易壁垒委员会发布的《关于制定国际标准、指南和建议的原则的决定》中确立的国际公认的标准化原则制定的。 ===意义和用途====== 4.1 本规程旨在供数字检测器阵列用户用于测量和记录采集的数字检测器阵列的基线性能，以便在其作为成像系统的整个服务过程中监测其性能。 本规程不打算用作DDA的“验收测试”。 4.2 本规程规定了要进行的测试及其所需的间隔时间。还定义了数字检测器阵列用户将在数字检测器阵列系统初始基线化后完成的结果制表方法。这些测试也将按照规定的时间间隔定期进行，以评估DDA系统，以确定该系统是否保持在本实践中确定的、用户和CEO之间定义的可接受的操作限制内。 4.3 影响数字检测器阵列图像质量的因素有几个，包括基本空间分辨率、几何不清晰度、散射、信噪比、对比度灵敏度、对比度/噪声比、图像滞后，以及某些类型的数字检测器阵列的老化。有几个额外的因素和设置会影响这些结果（例如，积分时间、探测器参数、成像软件，甚至X- 射线辐射质量）。此外，检测器校正技术可能对图像的质量产生影响。本规程规定了此处列出的每种特性的测试，并制定了确保DDA整个生命周期测试可重复性的标准技术。

1.1 This practice covers the baseline and periodic performance evaluation of Digital Detector Array (DDA) systems used for industrial radiography. It is intended to ensure that the evaluation of image quality, as far as this is influenced by the DDA system, meets the needs of users, and their customers, and enables process control to monitor long-term stability of the DDA system. 1.2 This practice specifies the fundamental parameters of DDA systems to be measured to determine baseline performance, and to track the long-term stability of the DDA system. 1.3 The DDA system tests specified in this practice shall be completed upon acceptance of the system from the manufacturer to baseline the performance of the DDA. Periodic performance testing shall then be used to monitor long-term stability of the system in order to identify when an action needs to be taken due to system degradation beyond a certain defined level. 1.4 Two types of phantoms, the duplex plate and the five-groove wedge, are used for testing as specified herein. The use of these two types of phantoms is not intended to exclude the use of other phantom configurations. In the event the tests or phantoms specified herein are not sufficient or appropriate, the user, in coordination with the cognizant engineering organization (CEO) may develop additional or modified tests, test objects, phantoms, or image quality indicators to evaluate the DDA system performance. Acceptance levels for these ALTERNATE test methods shall be determined by agreement between the user and CEO. 1.5 The user of this practice shall consider that higher energies than 450 keV may require different test methods or modifications to the test methods described here. This practice is not intended for usage with isotopes. 1.6 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. 1.7 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 ====== 4.1 This practice is intended to be used by the DDA user to measure and record the baseline performance of an acquired DDA in order to monitor its performance throughout its service as an imaging system. This practice is not intended to be used as an “acceptance test” of a DDA. 4.2 This practice defines the tests to be performed and their required intervals. Also defined are the methods of tabulating results that DDA users will complete following initial baselining of the DDA system. These tests will also be performed periodically at the stated required intervals to evaluate the DDA system to determine if the system remains within acceptable operational limits as established in this practice and defined between the user and CEO. 4.3 There are several factors that affect the quality of a DDA image including the basic spatial resolution, geometric unsharpness, scatter, signal to noise ratio, contrast sensitivity, contrast/noise ratio, image lag, and for some types of DDAs, burn-in. There are several additional factors and settings which can affect these results (for example, integration time, detector parameters, imaging software, and even X-ray radiation quality). Additionally, detector correction techniques may have an impact on the quality of the image. This practice delineates tests for each of the properties listed herein and establishes standard techniques for assuring repeatability throughout the lifecycle testing of the DDA.