Accuracy estimates for representation of the Landolt rings in raster graphics are discussed. The test presented here complies well with the criteria of DIN 58220.
An LCD screen with 400 x 640 pixel is used for graphic display. Īn automatic visual acuity test examining visual acuity at 5 m distance is presented. Although there is still a gap in technology between different types of LCDs, commercial color LCDs could replace diagnostic monochrome LCDs as a platform for reviewing abdominal CT images after monitor calibration. The overall results indicate that ROTPs can be implemented as a quality control tool to evaluate the intrinsic characteristics of display devices. The observation time (OT was 145Â☒7.6 min and 127Â☑9.3 min, respectively. The average area under the ROC curve (AUC for reviewing abdominal CT images was 0.717Â☐.0200 and 0.740Â☐.0195 for the color monitor and the diagnostic monitor, respectively. In the high background patterns of ROTPs, the sensitivity performance was comparable between both monitors in terms of contrast and resolution, whereas, in the low background patterns, the performance of the commercial color LCD was significantly poorer than that of the diagnostic monochrome LCD in all aspects. Five radiologists were invited to review the CT images, and receiver operating characteristic (ROC analysis was carried out using a five-point rating scale. The ROTPs were then merged into 120 abdominal CT images. In this study, we designed a set of randomized object test patterns (ROTPs consisting of randomly located spheres with various image characteristics to evaluate the performance of a 2.5 mega-pixel (MP commercial color LCD and a 3 MP diagnostic monochrome LCD in several aspects, including the contrast, resolution, point spread effect, and noise. The performance of display devices has to be verified to ensure that image quality is not degraded.
Comparison of the commercial color LCD and the medical monochrome LCD using randomized object test patterns.ĭirectory of Open Access Journals (Sweden)įull Text Available Workstations and electronic display devices in a picture archiving and communication system (PACS provide a convenient and efficient platform for medical diagnosis.
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