Contrast sensitivity in mammographic softcopy reading
Contrast sensitivity in mammographic softcopy reading
复制标题
乳房X线照相软拷贝阅读中的对比敏感度
DOI：
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发表时间：
2009
期刊：
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通讯作者：
H. Peitgen
中科院分区：
文献类型：
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作者：
D. Apelt;H. Strasburger;R. Rascher;J. Klein;B. Preim;H. Peitgen
在乳房X线摄影软拷贝阅读中，对比度分辨率的评估主要通过体模来执行，包括具有均匀图像背景的检测任务。对于视觉感知的任务，假设处理层次结构，其中检测任务代表基本水平。基于检测任务的调查结果可能无法预测在具有复杂图像的情况下识别低对比度图案的灵敏度。我们介绍了MCS方法（乳腺摄影对比敏感度），用于确定对比敏感度函数（CSF）在乳腺摄影。Gabor模式和数字被用作视觉目标。观察者必须科普的Gabor模式的方向辨别任务和数字的识别任务。对比度阈值的测量由心理物理阶梯程序在六个空间频率高达16个周期每度。进行了一项有8名观察员的研究，以显示MCS方法的适用性。观察者研究的结果与几个乳房X线摄影的情况下，该方法是适用的选择的图像无关。Gabor模式的目标的结果是不同的数字，无论是在整体灵敏度和形状的对比敏感度函数。因此，对模式识别的敏感性不能从Gabor CSF可靠地预测，并且应该优选更复杂的目标，如数字或字符。对比敏感度函数的测量不超过4分钟。该结果可用于评估观察条件的影响，目的是得出结论，乳房X线软拷贝阅读。
In mammographic softcopy reading, assessment of contrast resolution is mainly performed with phantoms, including detection tasks with a homogeneous image background. For tasks in visual perception a processing hierarchy is assumed, where detection tasks represent the base level. The results of investigations based on detection tasks might not allow predictions on the sensitivity for recognizing low-contrast patterns in a situation with complex images. We introduce the MCS method (Mammographic Contrast Sensitivity) for determining the contrast sensitivity function (CSF) in mammograms. Gabor patterns and digits are used as visual targets. The observers have to cope with an orientation discrimination task for the Gabor patterns and an identification task for the digits. The contrast thresholds are measured by a psychophysical staircase procedure at six spatial frequencies up to 16 cycles per degree. A study with eight observers was performed to show the applicability of the MCS method. The results of the observer study with several mammographic cases show that the approach is applicable independent of the chosen images. The results for Gabor pattern targets were different from those with digits, both in overall sensitivity and in the shape of the contrast sensitivity function. Sensitivity to pattern recognition is thus not reliably predicted from the Gabor CSF, and a more complex target like a digit or a character should be preferred. The measurement of a contrast sensitivity function does not take more than 4 minutes. The results can be used to appraise the effects of viewing conditions with an aim of drawing conclusions for mammographic softcopy reading.