1.1 本标准提供了一种实践，其中当暴露于光子能量为4MeV至25MeV的X辐射源时，可以使用相对图像质量响应（RIQR）的概念来比较评估工业射线照相成像系统或影响图像质量的特定因素（即硬件、技术等）。本规程中提出的RIQR方法基于规程中描述的等效透度计灵敏度（EPS）的使用 E1025 和Section 5. 这种做法。对于特殊应用，用户可以设计非标准的RIQI吸收器配置；但是，RIQI配置应通过类似于 图1 .非标准RIQI吸收器配置的使用应在用户的书面技术中进行描述，并经RT III级批准。 1.2 本规程不旨在评定特定射线照相技术的性能，也不旨在保证射线照相技术能够检测到接受射线照相检查的试样中的特定不连续性。 1.3 本规程不用于对射线照相成像系统的性能分类进行分类或推导性能分类类别。例如，射线照相胶片系统的性能分类可在试验方法中找到 E1815 ，计算机射线照相（CR）系统的制造商特征可在实践中找到 E2446 ，数字检测器阵列（DDA）系统的制造商特性可在实践中找到 E2597 . 1.4 本标准不适用于钴60源或4 MeV以下的X射线源。低能量X射线应用（4 MeV以下）的试验方法 E746 提供了类似的RIQR标准实践。 1.5 以国际单位制或英寸磅单位表示的数值应视为标准。括号中给出的值仅供参考。 1.6 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 本标准提供了一种实践，用于确定射线照相探测器（胶片、CR成像板或DDA）在暴露于4MeV至25MeV X射线时的相对图像质量响应，因为整个X射线系统的任何单个组件（例如屏幕）都是变化的。 4.2 该实践不旨在用于比较两种不同的系统或成像类型。 4.3 当通过吸收材料曝光时，该方法使用对胶片和非胶片成像系统的RIQR评估。第节提供了三种替代数据评估方法 8. 确定RIQR需要比较至少两张射线照片或射线照相过程，由此可以使用的EPS斑块布置来确定图像质量差异的相对程度 图1 作为相对图像质量指示符（RIQI）。与RIQI一起，必须为每个射线照相过程建立并仔细控制特定的射线照相技术或方法。本规程旨在确定工艺改进/变更、技术变更或设备属性变更可能导致的射线照相成像系统性能水平的EPS细微变化。本规程不涉及《规程》中规定的射线照相成像系统的相对不清晰度 E2002 任何相对比较的共同因素是对评估中的两个过程使用相同的RIQI安排。 4.4 除了第节中描述的标准评估方法之外 8. ，可能还有其他技术/方法，其中的基本RIQR排列 图1 可以用于执行相对图像质量性能的专门评估。例如，可以更改其他射线照相变量，以便于评估，前提是这些差异是已知的，并记录了这两种过程。在评估多个射线照相过程变量的情况下，本实践的用户有责任将这些正常过程属性控制到适合应用的程度。RIQR也可用于评估具有替代材料（RIQI和基板）的成像系统。当使用任何这些专业应用时，所使用的具体方法或技术应符合RT III级的规定和批准。

1.1 This standard provides a practice whereby industrial radiographic imaging systems or specific factors that affect image quality (that is, hardware, techniques, etc.) may be comparatively assessed using the concept of relative image quality response (RIQR) when exposed to X-radiation sources having photon energies from 4 MeV to 25 MeV. The RIQR method presented within this practice is based upon the use of equivalent penetrameter sensitivity (EPS) described within Practice E1025 and Section 5 of this practice. For special applications, the user may design a non-standard RIQI-absorber configuration; however, the RIQI configuration shall be controlled by a drawing similar to Fig. 1 . Use of a non-standard RIQI-absorber configuration shall be described in the user’s written technique and approved by the RT Level III. 1.2 This practice is not intended to qualify the performance of a specific radiographic technique nor for assurance that a radiographic technique will detect specific discontinuities in a specimen undergoing radiographic examination. 1.3 This practice is not intended to be used to classify or derive performance classification categories for radiographic imaging systems. For example, performance classifications of radiographic film systems may be found within Test Method E1815 , manufacturer characterization of computed radiography (CR) systems may be found in Practice E2446 , and manufacturer characterization of digital Detector Array (DDA) systems may be found in Practice E2597 . 1.4 This standard is not intended to be used with Cobalt 60 sources or X-ray sources below 4 MeV. For low energy X-ray applications (below 4 MeV), Test Method E746 provides a similar RIQR standard practice. 1.5 The values stated in either SI or inch-pound units are to be regarded as the standard. The values given in parentheses are for information only. 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 standard provides a practice for determining the relative image quality response of a radiographic detector (film, CR imaging plate, or DDA) when exposed to 4 MeV to 25 MeV X-rays as any single component of the total X-ray system (for example, screens) is varied. 4.2 The practice is not intended to be used to compare two different systems or imaging types. 4.3 The approach uses RIQR evaluations of film and non-film imaging systems when exposed through an absorber material. Three alternate data evaluation methods are provided in Section 8 . Determining RIQR requires the comparison of at least two radiographs or radiographic processes whereby the relative degree of image quality difference may be determined using the EPS plaque arrangement of Fig. 1 as a relative image quality indicator (RIQI). In conjunction with the RIQI, a specified radiographic technique or method must be established and carefully controlled for each radiographic process. This practice is designed to allow the determination of subtle changes in EPS that may arise to radiographic imaging system performance levels resultant from process improvements/changes, technique changes, or change of equipment attributes. This practice does not address relative unsharpness of a radiographic imaging system as provided in Practice E2002 . The common element with any relative comparison is the use of the same RIQI arrangement for both processes under evaluation. 4.4 In addition to the standard evaluation method described in Section 8 , there may be other techniques/methods in which the basic RIQR arrangement of Fig. 1 might be utilized to perform specialized assessments of relative image quality performance. For example, other radiographic variables can be altered to facilitate evaluations provided these differences are known and documented for both processes. Where multiple radiographic process variables are evaluated, it is incumbent upon the user of this practice to control those normal process attributes to the degree suitable for the application. RIQR may also be useful in evaluating imaging systems with alternate materials (RIQI and base plate). When using any of these specialized applications, the specific method or techniques used shall be as specified and approved by the RT Level III.