The Impact of target prevalence in Medical Image Visual Searching of Novice and Expert Radiologists： Evidence from Eye Movement
- 厦门大学－已发表论文 
探讨低事件率对医学图像视觉搜索漏报的影响,用SMI250眼动仪记录放射科专家与新手检测胸部X光片的过程。结果发现：（1）专家和新手在低事件率（10%）下的漏报率多于高事件率（50%）,但专家在高低事件率的漏报率的差值小于新手。（2）专家和新手在低事件率下的注视次数少于高事件率,眼跳幅度、扫描错误比例大于高事件率。结论认为：专家与新手进行医学图像视觉搜索时出现低事件率效应,低事件率效应主要是由于扫描错误引起的。To measure the effect of abnormality-prevalence on novices and experienced radiologists＇ performance during pulmonary nodular lesion detection on a chest radiograph, SMI250 eye tracker was used to record participants＇ eye movements. We asked experts and novices to detect chest X-ray in different target prevalence （50% or 10%） . The results showed that： 1） the miss （false-negative） rate of experts and novices in low prevalence （10%） was significantly higher than that of high prevalence （50%） , but the miss rate difference of experts in high and low prevalence was less than that of novices. 2） Experts and novices spent less fixation counts but more fixation duration average in low prevalence. In addition, the average saccade amplitude and the scanning error in low prevalence were greater than that in high prevalence. These findings suggested that scanning errors were the main reason for the more miss errors in low prevalence than those in high prevalence.