Effects Of The CT Display Window On Detectability Of Large And Small Lesions
Effects Of The CT Display Window On Detectability Of Large And Small Lesions
复制标题
CT显示窗口对大、小病灶可检性的影响
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
R. Swensson
中科院分区：
文献类型：
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作者：
D. A. Twible;P. Judy;R. Swensson
通过测量对比细节“阈值”和病变可检测性（使用 ROC 分析），研究了 CT 显示窗口宽度和病变大小对观察者性能的影响。两种测量观察者感知性能的方法都表明，随着显示窗口宽度的增加，病灶变得不那么明显，并且对于较大（较低对比度）病灶，这种效应的程度大于较小（较高对比度）病灶。 CT 显示窗口的操作不会影响物理图像的信息内容，这是通过“病灶匹配”滤波器的信噪比的实际计算来测量的。因此，显示窗口对观察者表现的影响归因于人类视觉系统的心理物理特性。
The effects of CT display window width and lesion size on observer performance were studied by measurements of contrast-detail "thresholds" and lesion detectability (using ROC analysis). Both methods of measuring observers' perceptual performance showed that lesions became less visible as the width of the display window increased, and that the magnitude of this effect was greater for larger (lower contrast) lesions than for smaller ( higher contrast) lesions. Manipulations of the CT display window did not affect the information content of the physical image, as measured by actual calculations of signal-to-noise ratio for a "lesion-matched" filter. Therefore, the effects of display window on observer performance were attributed to psychophysical properties of the human visual system.