Figure 11: Example case for bad AR visualization due to positioning problems. Blue arrows indicate the position of the injection spot, green arrows mark the SLN. (a) Scintigraphy image of the patient showing one SLN in the frontal view. (b) Confusing AR image during surgery. The patient target (circle) is placed on the sternum. The SLN is actually deep in the axilla, but seems to be on top of the breast in the AR view. (c) Illustration for a better camera position for proper AR visualization. (d) Visualization of the SLN using VR and depth measurement.