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Human Factors in Matching Images to Standards: Assimilation and Time Order Error

Elfering A.

International Journal of Occupational Safety and Ergonomics

2005

Vol. 11, No. 4

399--407

Objectives: This study examines recognition performance to depend on image context and time order error. Recognition of standard images is a basic process in medical image analysis. Methods: After the presentation of a standard square, 20 subjects identified the standard within a variety of 7 squares. The choice was between the standard and either 3 smaller and 3 larger squares, 5 smaller and 1 larger square, or 5 larger and 1 smaller square (context conditions). Results: Multilevel regression analysis showed large individual differences in judgments (P < .001). Context induced assimilation of judgments to the medium-sized square within response options (P < .001). Negative time order error in rapid judgments caused an underestimation of the standard (P < .001). Conclusions: Assimilation of judgments and time order error might be a threat to the reliability of medical image analysis. Some procedural recommendations are derived to reduce bias and increase patient safety in radiology.