The SonoWand Invite™ consists of a high-performance ultrasound scanner combined with a powerful navigation computer and optical tracking system. The system supports a number of trackable instruments and accessories such as navigators, ultrasound probes and General Purpose Localizers. Patient image display techniques for planning and navigation include the conventional ACS (axial, coronal, sagittal) views. Additionally, other more intuitive and powerful display techniques are included. SonoWand Invite™ has a compact design compared to conventional two-rack system solutions and saves vital space in the operating room. SonoWand Invite™ may also be used as a conventional neuronavigation system using DICOM MRI or CT images, or as a stand-alone 3D ultrasound intraoperative imaging system without pre-operative images (3D Direct). Key features include a Multi-Modal 3D Image Visualization, 3D Direct Ultrasound (No pre-operative Mr or CT images needed), 3D Power Doppler Angiography, Real Time Neuronavigation, and a High quality integrated ultrasound scanner.