This Report replaces IPEM Report 77 and provides essential guidance for anyone responsible for diagnostic X-Ray equipment. This document gives clear advice on which routine performance tests are essential and which are desirable, where to get information on how to do them, who should be doing them and how often they should be done. For many tests it also gives guidance as to when the results indicate further action should be taken. This second edition takes into account the introduction of new technologies in medical imaging including CR, DDR and image display devices.