YY/T 0590.1-2005

This part of YY/T 0590 specifies the measurement method for the quantum detection efficiency (DQE) of digital X-ray imaging devices. Under the working conditions specified by the manufacturer for medical applications, the quantum detection efficiency (DQE) is a function of irradiation dose and spatial frequency. This part applies to digital X-ray imaging devices that produce images in digital format for medical diagnosis. The scope of application of this part is limited to digital X-ray photographic devices used for single-exposure imaging, such as CR systems, selenium-based imaging systems, flat-panel detectors, optically coupled CCD imaging systems, and digital X-ray image intensifiers. This part does not apply to: — Digital X-ray imaging devices for breast photography and dental photography; — Computed tomography equipment; — X-ray systems for scanning the human body; — Dynamic imaging devices (in which a series of images are collected, such as fluoroscopy and cardiac imaging). The above-mentioned devices are not included in this part because many of their parameters (such as radiation quality, geometric relationships, time dependence, etc.) differ greatly from those of conventional X-ray photography, and these parameters are regulated by separate standards for other topics, such as the separate specifications for sensitivity and contrast in IEC and ISO.