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This article is to discuss the radiologist’ fixation characteristics and processing strategies in medical image searching, and to find out the expert advantages and characteristics, in order to provide theoretical basis for improving the ability of novice and proficient radiologist. SMI250 eye tracker was used to record participants’ eye movements on the X-ray film of chest. Fifty subjects were divided into three groups: 17 experts,17 proficient and 16 novices. Eye movement was observed and analyzed, The 2 or t test were used for statistical analysis. The results showed that false negative rate (FNR) of experts was lower than that of proficient or novices. There are more types of simple –mode scan pattern in the expert group than in the proficient or novice (P<0.05). Besides, experts exhibited a number of characteristics associated with efficient scan paths, including fewer fixation counts, less total fixation duration, longer saccadic amplitude, faster in arriving at the nodule. For conclusion, compared with novices and proficient, expert radiologist can find out the target quickly and accurately, showing superior perceptual advantage. Experts tended to make decision-making error, while the novice tended to scanning-error and proficient to recognition-error. Introduction Lung cancer has become the most common malignant tumor and has a high death rate. Its five-year survival rate is 12%~15%, then that of early stage of lung cancer is 70% ~ 80%, so early screening will improve the survival rate of patients with lung cancer[1-2]. It is the first choice of screening for lung cancer with chest X-ray film, that is the low price and weak radiation dose, but there are a rather high rate of missed diagnosis [3-6], which not only affects the patient's treatment, but also affects the personal reputation of doctor, and results in the medical disputes. How to cause the high rate of missed diagnosis? Recent research [7,8] demonstrates that the "human error" is the main factor, including the bias of the doctor's attention and the wrong search strategy. Kundel et al [7] have pioneered the study field of using the eye movement technology to discuss the causes of missing reports in medical imaging. In this study, chest X-ray as the observation object, eye movement differences of experts, proficient and novices were compared on detecting pulmonary nodule, as well as the cause of missed diagnosis was discussed. Method Participants. 50 radiologists were divided into 3 groups: 17 experts, 17 proficient and 16 novices. Experts were associate-chief physicians with clinical experience of more than 10 years from a hospital (Grade A of three-class) of Fujian Province. Proficient were physicians with clinical experience of 2-5 years in the same hospital. Novices were medical imaging students having practiced in the department of radiology for over 6 months. There are 14 males and 3 females in 13 Advances in Social Science, Education and Humanities Research (ASSEHR), volume 117 2017 International Conference on Social Science (ICoSS 2017)

A Comparative Research in Medical Image Visual Searching of Novice, Proficient and Expert Radiologists: Evidence from Eye Movement