Figure 7From: Study on the clinical application of pulsed DC magnetic technology for tracking of intraoperative head motion during frameless stereotaxyType B1 fixation of the head. (A) Patient positioned on the right side for resection of a left frontal metastasis. (B) After repositioning in the prone position for resection of a left parieto-occipital metastasis. (C) Screenshot of the navigation system showing the location of the two tumours. 3p = Three point; r.a. = retroauricular.Back to article page