Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2006 Jul;2(3):e38.
doi: 10.2349/biij.2.3.e38. Epub 2006 Jul 1.

Development of a randomised contrast detail digital phantom for observer detectability study

Ms Nizam  1 , Kh Ng, Bjj Abdullah
Affiliations

Development of a randomised contrast detail digital phantom for observer detectability study

Ms Nizam et al. Biomed Imaging Interv J. 2006 Jul.

Abstract

The accuracy and the efficacy of radiological diagnosis depend, to a large extent, on the conditions under which radiographs and images are viewed. This mainly involves the luminance of the display devices and the ambient room illumination. We report a perceptual study to investigate the relationship between detectability and monitor luminance as well as ambient illuminance. A statistical test pattern was used in this study, and the test pattern was developed using Microsoft® Visual Basic 6. The test pattern contained a set of randomised contrast detail objects, that is, disks of different diameters (0.7, 1.0, 1.4, and 2.0 mm) and contrasts against a black background (2.7, 3.9, 5.5, and 7.8%), simulating lesions in digital images. The receiver operating characteristic (ROC) analysis was used in this study. The results indicated that a set of optimal viewing conditions exists and that it has a significant effect on detectability performance.

Keywords: Image quality; contrast detail; perception; receiver operating characteristics.

PubMed Disclaimer

Figures

Figure 1
Figure 1
An image produced by the digital phantom showing the matrices (squares) containing randomly generated disks.
Figure 2
Figure 2
Text document produced by the digital phantom giving information on disk location (column and row, and x- and y- position), size, and contrast.
Figure 3
Figure 3
ROC curve (n=10) for 1.0 mm disks on 120 cdm-2 CRT monitor.
Figure 4
Figure 4
ROC curve (n=10) for 1.0 mm disks on 80 cdm-2 CRT monitor.
See this image and copyright information in PMC

References

    1. Roehrig H, Krupinski E. Image Quality of CRT displays and the effect of brightness of diagnosis of mammograms. J Digit Imaging. 1998;11(3) Suppl 1:187–8. - PMC - PubMed
    1. Flynn MJ, Badano A. Image quality degradation by light scattering in display devices. J Digit Imaging. 1999;12(2):50–9. - PMC - PubMed
    1. Hemminger BM, Dillon AW, Johnston RE, et al. Effect of display luminance on the feature detection rates of masses in mammograms. Med Phys. 1999;26(11):2266–72. - PubMed
    1. Roehrig H, Krupinski EA, Furukawa T. Evaluation of a flat CRT monitor for use in radiology. J Digit Imaging. 2001;14(3):142–8. - PMC - PubMed
    1. Chakrabarti K, Kaczmarek RV, Thomas JA, et al. Effect of room illuminance on monitor black level luminance and monitor calibration. J Digit Imaging. 2003;16(4):350–5. - PMC - PubMed

LinkOut - more resources