图像质量指示 meaning in English

image quality indicator

Iqi standard practice for design , manufacture , and material grouping classification of hole - type image quality indicators used for radiology
辐射摄影术用孔型图像质量指示仪
Non - destructive testing ; image quality of radiographs ; part 2 : image quality indicators step hole type ; determination of image quality value ; german version en 462 - 2 : 1994
无损检验.射线照相的图像质量.第2部分:图像质量指示