Impact of adaptation time on contrast sensitivity

Impact of adaptation time on contrast sensitivity
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适应时间对对比敏感度的影响

DOI:
10.1117/12.845241
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发表时间:
2010
期刊:
影响因子:
--
通讯作者:
Preim B.
Preim B.
中科院分区:
--
文献类型:
--
作者:
Apelt D;Strasburger H;Klein J;Preim B.

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对于乳房X线照片的软拷贝读取,标准程序中建议室内照度为10 lx。室内照度影响显示器的最大对比度和视觉系统的整体亮度适应。当进入阅读室时,放射科医生观察者必须适应低亮度水平。由于观察者对低对比度模式的敏感度取决于适应状态和过程,因此可以预期在阅读会话开始时对比度敏感度较低。我们研究了暗适应的初始时间对对比敏感度的影响。在乳房X线摄影软拷贝阅读的背景下进行了一项有8名观察员的研究。使用不同的空间频率,方向,和对比度水平的刺激在方向辨别任务的Gabor模式,内观察者的对比敏感度确定为中心凹视觉。在执行辨别任务之前,观察者适应450 lx的平均照度两分钟。此后,在10 lx室内照度下重复测量对比度阈值15分钟。结果显示在15分钟期间对比敏感度没有显著变化。因此,可以得出结论,采取初始适应时间不会影响在典型的软拷贝阅读环境中呈现的乳房X线摄影图像中的低对比度对象的感知。因此,当观察者立即开始阅读乳房X线照片时,阅读性能不会受到负面影响。结果可用于优化放射学阅读室的工作流程。
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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DOI: --
发表时间: 2005
期刊: Radiographics
影响因子: 5.5
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期刊: Radiographics : a review publication of the Radiological Society of North America, Inc
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DOI: --
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影响因子: --
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DOI: --
发表时间: 2003
期刊:
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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
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