Objective: Expert radiologists exhibit high levels of visual diagnostic accuracy from review of radiological images, doing so after accumulating years of training and experience. To train new radiologists, learning interventions must focus on the development of these skills. By developing a web-based measure of image assessment, a key part of visual diagnosis, we aimed to capture differences in the performance of expert, trainee and non-radiologists. Methods: Twelve consultant paediatric radiologists, twelve radiology registrars, and thirty-nine medical students were recruited to the study. All participants completed a two-part, online task requiring them to visually assess 30 images (25 containing an Title Page

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