1.1 Scope This part of IEC1223 applies to those components of X-ray equipmentwhich influence the image quality ofequipmentfor digital subtraction angiography (DSA) with an imaging system consisting of an X-raygeneration subsystem, a detection device comprising an X-ray image intensifiertelevision chain, means of digitization and digital image processing, image storage and image manipulation including subtraction, and facilities for image display. This standard does not apply to general equipment of digital imaging. If such an equipment includes a DSA function, it is restricted to the DSA function. 1.2 Object This part of IEC1223 defines: the essential parameters which describe the performance of the above-mentioned components of X-ray equipmentwith regard to imaging properties; methods of testing whether measured quantities related to those parameters comply with specified tolerances. These methods mainly rely on non-invasive measurements using appropriate test equipment performed during the installation or after the installation is completed. Signed statements covering steps in the installation procedure can be used as part of acceptance testing. The aim is to verify compliance of the installation with specifications affecting the image quality, and to detect malfunctions affecting the image quality that are not in agreement with those specifications. This standard does not in itself specify tolerances for the parameters under investigation. Neither is it intended to consider: aspects of mechanical and electrical safety; aspects of mechanical, electrical and software performance unless they are essential to the performance of the tests directly affecting the image quality.