Multipoint rank-order study methodology: observer issues.
Multipoint rank-order study methodology: observer issues.
复制标题
多点排序研究方法：观察者问题。
DOI：
10.1097/00004424-200002000-00006
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发表时间：
2000
影响因子：
6.7
通讯作者：
Gur,D
中科院分区：
文献类型：
--
作者：
Towers,JD;Holbert,JM;Britton,CA;Costello,P;Sciulli,R;Gur,D
Towers JD，Holbert JM，布里顿CA，Costello P，Sciulli R，Gur D.多点排序研究方法：观察员问题。2000年投资无线电第三十五章：125- 130.合理性和可行性。我们进行了一个多点排序实验来评估观察者对图像呈现中微小差异的敏感性的变化，并评估观察者作为任务类型和数量的函数的表现。方法：向五名有经验的观察者提供四组胸部图像，这些图像被压缩到五个不同的水平。每组包含6个图像，范围从非压缩到约60：1压缩图像。观察者被要求回顾每一个病例的所有图像，并对每个图像的“质量”进行排序，以确定是否存在间质性疾病和/或气胸。那些表现良好的人这样做，无论他们是否在多疾病或单一疾病setting.CONCLUSIONS排名一个特定的异常选择的观察者可以可靠地检测相似的图像之间的非常小的差异。这些读数器可用于确认或排除客观的双功能型研究的必要性。
Towers JD, Holbert JM, Britton CA, Costello P, Sciulli R, Gur D. Multipoint rank-order study methodology: Observer issues. Invest Radiol 2000; 35: 125–130.RATIONALE AND OBJECTIVES.We performed a multipoint rank-order experiment to evaluate variability in observers’ sensitivity to small differences in image presentation and to assess observers’ performance as a function of the type and number of tasks included.METHODS.Five experienced observers were presented with four sets of chest images that had been compressed at five different levels. Each set contained six images ranging from noncompressed to approximately 60: 1-compressed images. Observers were asked to review all images of each case side by side and rank-order the “quality” of each to enable determination of the presence or absence of interstitial disease and/or pneumothoraces.RESULTS.Observers varied significantly in their ability to detect very small differences among the images (P< 0.001). Those who performed well did so regardless of whether they ranked a specific abnormality in a multidisease or a single-disease setting.CONCLUSIONS.Selected observers can reliably detect very small differences among similar images. These readers could be used to confirm or rule out the need for objective observer-performance–type studies.