BS EN 62220-1:2004

Medical electrical equipment. Characteristics of digital X-ray imaging devices. Determination of the detective quantum efficiency | Status: Superseded, Withdrawn

1 Scope This part of IEC 62220 specifies the method for the determination of the detective quantum efficiency (DQE) of digital X-ray imaging devices as a function of exposure and of spatial frequency for the working conditions in the range of the medical application as specified by the manufacturer. This part of IEC 62220 is applicable to projection digital X-ray imaging devices producing images in digital format that are used for medical diagnosis. It is restricted to digital X-ray imaging devices that are used for radiographic imaging, such as CR systems, selenium-based systems, flat panel detectors, optically coupled CCD detectors, and digital X-ray image intensifiers used for single exposures. This part of IEC 62220 is not applicable to

• — digital X-ray imaging devices intended to be used in mammography or in dental radiography;
• — computed tomography:
• — systems in which the X-ray field is scanned across the patient; and
• — devices for dynamic imaging (where series of images are acquired, as in fluoroscopic or cardiac imaging).

NOTE The devices noted above are excluded because they contain many parameters (for instance, beam qualities, geometry, time dependence, etc.) which differ from those important for general radiography. It is intended to treat some of these techniques in separate standards as has been done for other topics, for instance for speed and contrast, in IEC and ISO standards.