Kundel H L, Nodine C F, Toto L
Department of Radiology, University of Pennsylvania, Philadelphia 19104-6086.
Invest Radiol. 1991 Sep;26(9):777-81. doi: 10.1097/00004424-199109000-00001.
Four subjects searched a chest image for lung nodules using an eye position-dependent display that presented the image of a nodule selectively to either the central or peripheral visual field, while preserving the appearance of the chest. The time required to scan the image and fixate the nodule was shortest for nodules that were both reported and accessible to the peripheral vision. A stepwise concentric reduction in the size of the peripheral field that could access the nodules only affected search performance when the field was less than 5 degrees. (A chest image subtends about 25 degrees.) These data support the hypothesis that the optimal scanning strategy for lung nodules consists of spacing fixation clusters 5 degrees apart, and that peripheral vision only acts as an adjunct in guiding the gaze to inconspicuous nodules.
四名受试者使用一种与眼睛位置相关的显示器在胸部图像中搜索肺结节，该显示器会有选择地将结节图像呈现给中央或周边视野，同时保持胸部的外观。对于那些既被报告又能被周边视觉感知到的结节，扫描图像并注视结节所需的时间最短。仅能让周边视野看到结节的周边视野逐步同心缩小，只有当视野小于5度时才会影响搜索性能。（一张胸部图像所对视角约为25度。）这些数据支持了以下假设：肺结节的最佳扫描策略是将注视点群间隔5度分布，并且周边视觉仅在引导目光看向不明显的结节时起辅助作用。
