A Model for Consistency Analysis of Radiological CRT Monitors

This study examines the performance of a selection (n = 33) of cathode ray tube monitors used in radiology. Previously published quality assurance tests and standards are used and evaluated and the data provided were used to determine the utility of each test. Recommendations for a program of consistency analysis suitable for imaging departments using cathode ray tube devices are made. The tests included in this study are: examination of the ambient viewing environment; calibration of the monitor to the Digital Imaging and Communications in Medicine Grayscale Standard Display Function; and assessment of image quality using a selection of American Association of Physicists in Medicine Task Group 18 (TG18) test patterns. Cathode ray tube monitor performance was seen to vary across departments and nonadherence to international standards for specific parameters was noted. On the basis of the results, a program for consistency analysis was recommended. Ambient light levels should be assessed using a photometer. Calibration of workstation monitors should be completed on a quarterly basis. Comprehensive image quality analysis using the TG18-Quality Control test pattern that facilitates the investigation of a number of quality parameters must be assessed at parameter-specific intervals. This should be supplemented with the TG18-Glare Visual test pattern for an assessment of veiling glare. Implementation of the recommendations above should enhance diagnostic efficacy and subsequent patient management.