Fig. 3.

Top: experimental set-up: the user holds the pointer in one hand and the marker in the other. Depending on the condition he or she looks either at the mobile phone (outfitted with a tracker) for the AR visualisation or on the desktop for either AR or IGNS navigation. The purpose of the task is to draw the contour of the tumour on the surface of the phantom. Bottom left: subjects’ point of view of the experimental set-up when testing the mobile AR condition. Bottom right: screenshot of the desktop AR view