Interventional radiology procedures require\nextensive cognitive processing from the physician. A set of\nthese cognitive functions are aimed to be replaced by\ntechnology in order to reduce the cognitive load. However,\nlimited knowledge is available regarding mental processes\nin interventional radiology. This research focuses on\nidentifying mental modelââ?¬â??related processes, in particular\nduring percutaneous procedures, useful to improve image\nguidance during interventions. Ethnographic studies and a\nprototype-based study were conducted in order to perform\na task analysis and to identify working strategies and\ncognitive processes. Data were compared to theories from\nvisual imagery. The results indicate a high level of complexity\nof mental model construction and manipulation,\nin particular when mentally comparing mental model\nknowledge with radiology images on screen (e.g., to steer a\nneedle correctly). Regarding current interface support,\nmost difficult is the interpretation and selection of oblique\nviews. New interface principles are needed to bring cognitive\ndemands within reasonable human range, and\nalso accompanying cognitive work strategies should be\ndeveloped.
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