Impact of adaptation time on contrast sensitivity
Impact of adaptation time on contrast sensitivity
复制标题
适应时间对对比敏感度的影响
DOI:
10.1117/12.845241
复制
发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Preim B.
中科院分区:
文献类型:
--
作者:
Apelt D;Strasburger H;Klein J;Preim B.
For softcopy-reading of mammograms, a room illuminance of 10 lx is recommended in standard procedures. Room illuminance affects both the maximal monitor contrast and the global luminance adaptation of the visual system. A radiologist observer has to adapt to low luminance levels, when entering the reading room. Since the observer's sensitivity to low-contrast patterns depends on adaptation state and processes, it would be expected that the contrast sensitivity is lower at the beginning of a reading session. We investigated the effect of an initial time of dark adaptation on the contrast sensitivity. A study with eight observers was conducted in the context of mammographic softcopy-reading. Using Gabor patterns with varying spatial frequency, orientation, and contrast level as stimuli in an orientation discrimination task, the intra-observer contrast sensitivity was determined for foveal vision. Before performing the discrimination task, the observers adapted for two minutes to an average illuminance of 450 lx. Thereafter, contrast thresholds were repeatedly measured at 10 lx room illuminance over a course of 15 minutes. The results show no significant variations in contrast sensitivity during the 15 minutes period. Thus, it can be concluded that taking an initial adaptation time does not affect the perception of lowcontrast objects in mammographic images presented in the typical softcopy-reading environment. Therefore, the reading performance would not be negatively influenced when the observer started immediately with reading of mammograms. The results can be used to optimize the workflow in the radiology reading room.
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影响因子:
5.5
作者:
E. Samei
通讯作者:
E. Samei
DOI:
10.1148/radiographics.19.5.g99se191313
发表时间:
1999
期刊:
Radiographics : a review publication of the Radiological Society of North America, Inc
影响因子:
--
作者:
H. Kundel;S. Weinstein;E. Conant;L. Toto;C. Nodine
通讯作者:
C. Nodine
DOI:
--
发表时间:
2009
期刊:
Medical Imaging
影响因子:
--
作者:
D. Apelt;R. Rascher;J. Klein;H. Strasburger;B. Preim;H. Peitgen
通讯作者:
H. Peitgen
DOI:
--
发表时间:
2003
期刊:
影响因子:
--
作者:
M. Flynn
通讯作者:
M. Flynn
DOI:
--
发表时间:
2009
期刊:
Medical Imaging
影响因子:
--
作者:
D. Apelt;H. Strasburger;R. Rascher;J. Klein;B. Preim;H. Peitgen
通讯作者:
H. Peitgen