Operating principle Preoperative image acquisition Load and select the images to displaySelect an exam for the 3D reconstruction of the patient’s head Select an exam to display as first exam Select another image to display as second exam(optional) Select and merge an atlas (optional) Select the two X-Ray images to display (optional) Exams can be imported by different means: through the PACS (network), from a peripheral device (Imaging system),and portable media (CD, DVD and USB flash drive).