1.1 该参考射线照片涵盖了一系列测试目标，适用于评估、量化和记录射线数字化过程或电子图像重建过程或两者的性能参数。该参考射线照片可用于数字化系统的视觉和电子分析。这是三个相关标准中的第一个。后续标准将为测试目标的使用和推荐的系统性能水平提供指导 1.2 该参考射线照片提供了一系列测试目标，为评估空间分辨率、密度对比灵敏度、动态范围和空间线性以及数字化系统的其他方面提供了一种载体。 测试目标适用于评估空间分辨率低至的数字化系统 ∼ 1/1000英寸。（25微米（μ））密度对比灵敏度降至0.02光密度（OD），密度范围为0.5至4.5 OD，薄膜尺寸容量为14英寸。（355毫米）宽x 17英寸。（431 mm）长。 1.3 以英寸-磅单位表示的值应视为标准值，但空间分辨率目标除外( 6.2 和 6.7 )以国际单位制表示。 1.4 本标准无意解决与其使用相关的安全问题（如有）。 本标准的用户有责任在使用前制定适当的安全和健康实践，并确定监管限制的适用性。

1.1 This reference radiograph covers a series of test targets suitable for evaluating, quantifying, and documenting performance parameters of the radiographic digitization process or the electronic image reconstruction process, or both. This reference radiograph can be used for visual and electronic analysis of digitization systems. This is the first of three related standards. Subsequent standards will provide guidance on the use of the test targets and recommended system performance levels 1.2 This reference radiograph provides a series of test targets to provide a vehicle for the evaluation of spatial resolution, density contrast sensitivity, dynamic range, and spatial linearity as well as other aspects of a digitization system. The test targets are suitable for evaluating a digitization system with a spatial resolution down to ∼ 1/1000 in. (25 micrometres (μ)) a density contrast sensitivity down to 0.02 optical density (OD), a density range of 0.5 to 4.5 OD, and a film size capacity of 14 in. (355 mm) wide by 17 in. (431 mm) long. 1.3 The values stated in inch-pound units are to be regarded as the standard, with the exception of the spatial resolution targets ( 6.2 and 6.7 ) which are stated in SI units. 1.4 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.