Image monitors and viewing boxes have a crucial role in the diagnostic process. Modern radiology uses different modalities to produce digital images which are to be viewed in different parts of the radiology department and throughout the hospital, sometimes simultaneously, via the Picture Archiving and Communications System (PACS). Therefore, the quality of the image monitors is of great importance. IPEM notes that inadequacies in the imaging viewing area may serve to negate the benefits of other efforts made to maintain quality and consistency. Suspension criteria for diagnostic image monitors and viewing boxes are presented in RP162. These criteria are mainly based on two documents, IPEM report 91, 'Recommended standards for the routine performance testing of diagnostic x-ray imaging systems' (2005) and AAPM on-line report no. 03, 'Assessment of display performance for medical imaging systems' (2005). The development of common European suspension levels for image monitors and viewing boxes will be a valuable tool in quality assurance.