Adaptation aftereffects in the perception of radiological images.
Adaptation aftereffects in the perception of radiological images.
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DOI：
10.1371/journal.pone.0076175
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Webster MA
中科院分区：
文献类型：
--
作者：
Kompaniez E;Abbey CK;Boone JM;Webster MA
放射科医生必须根据视觉检查对医学图像进行分类和解释。我们研究了如何感知放射扫描可能会受到视觉系统中常见的适应过程的影响。适应选择性地调节对当前视图中刺激的属性的敏感性，在随后观看的刺激的外观中引起后效。这些感知变化已经被发现会影响许多视觉属性，但它们是否与医学图像感知相关还不清楚。为了检验这一点，我们测试了放射学扫描的特征空间结构是否会产生后遗症，以及这是否会使它们的外观沿常规用于分类它们的沿着维度发生偏差。测量的重点是适应正常乳房X线照片的图像的影响，并在非放射科医生的观察者中进行测试。乳房X线照片中的组织密度是通过目测来评估的，范围从“致密”到“脂肪”。“这些类别之间的中间水平不同的图像阵列是通过混合具有不同权重的密集和脂肪图像创建的。观察者首先通过观察致密或脂肪组织的图像样本来适应，然后通过使用纹理匹配任务来判断中间图像的外观。这揭示了明显的感知后效应-先前暴露于密集图像导致中间图像看起来更脂肪，反之亦然。此外，适应图像本身的外观随着长时间观看而改变，因此它们变得不那么独特。这些后效不能通过图像的对比度差异或功率谱来解释，而是倾向于从相位谱来解释。我们的研究结果表明，观察者可以选择性地适应放射图像的属性，这种选择性可能会强烈影响图像的感知纹理特征。
Radiologists must classify and interpret medical images on the basis of visual inspection. We examined how the perception of radiological scans might be affected by common processes of adaptation in the visual system. Adaptation selectively adjusts sensitivity to the properties of the stimulus in current view, inducing an aftereffect in the appearance of stimuli viewed subsequently. These perceptual changes have been found to affect many visual attributes, but whether they are relevant to medical image perception is not well understood. To examine this we tested whether aftereffects could be generated by the characteristic spatial structure of radiological scans, and whether this could bias their appearance along dimensions that are routinely used to classify them. Measurements were focused on the effects of adaptation to images of normal mammograms, and were tested in observers who were not radiologists. Tissue density in mammograms is evaluated visually and ranges from "dense" to "fatty." Arrays of images varying in intermediate levels between these categories were created by blending dense and fatty images with different weights. Observers first adapted by viewing image samples of dense or fatty tissue, and then judged the appearance of the intermediate images by using a texture matching task. This revealed pronounced perceptual aftereffects – prior exposure to dense images caused an intermediate image to appear more fatty and vice versa. Moreover, the appearance of the adapting images themselves changed with prolonged viewing, so that they became less distinctive as textures. These aftereffects could not be accounted for by the contrast differences or power spectra of the images, and instead tended to follow from the phase spectrum. Our results suggest that observers can selectively adapt to the properties of radiological images, and that this selectivity could strongly impact the perceived textural characteristics of the images.
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