Effect of display luminance on the feature detection rates of masses in mammograms

被引:12
|
作者
Hemminger, BM
Dillon, AW
Johnston, RE
Muller, KE
Deluca, MC
Coffey, CS
Pisano, ED
机构
[1] Univ N Carolina, Dept Radiol, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Dept Biomed Engn, Chapel Hill, NC 27599 USA
[3] Univ N Carolina, Dept Biostat, Chapel Hill, NC 27599 USA
关键词
image display; display systems; digital imaging; mammography; image perception;
D O I
10.1118/1.598740
中图分类号
R8 [特种医学]; R445 [影像诊断学];
学科分类号
1002 ; 100207 ; 1009 ;
摘要
Our purpose in this study was to determine the importance of the luminance range of the display system for the detection of simulated masses in mammograms. Simulated masses were embedded in selected portions (512 x 512 pixels) of mammograms digitized at 50 mu pixels, 12 bits deep. The masses were embedded in one of four quadrants in the image. An observer experiment was conducted in which the observer's task was to determine in which quadrant the mass is located. The key variables involved in each trial included the position of the mass, the contrast level of the mass, and the luminance of the display. The contrast of the mass with respect to the background was fixed to one of four selected contrast levels. The digital images were printed to film, and displayed on a mammography lightbox. The display luminance was controlled by placing neutral density films between the laser printed films of mammographic backgrounds and the lightbox. The resulting maximum luminances examined in this study ranged from 34 cd/m(2) to 2056 cd/m2. Twenty observers viewed 80 different images (20 observations at each of 4 different mass contrast levels) under each of the 5 luminance conditions for a total of 800 independent observations per observer. An analysis of variance yielded no statistically significant correlation between the luminance range of the display and the feature detection rate of the simulated masses in mammograms. However, the performance of the lower luminance display systems (less than 300 cd/m(2)), may be reduced due to the high levels of ambient light found in many reading environments. (C) 1999 American Association of Physicists in Medicine. [S0094-2405(99)01811-8].
引用
收藏
页码:2266 / 2272
页数:7
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