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OV4 is a comprehensive and high performance surgical navigation system for Neurosurgery and ENT, Spine and Maxillofacial surgeries. Using advanced technology and high precision IR camera it offers surgeons more accurate and reliable navigation during surgery.

OV4 has fast, user friendly and robust software which provides simple and minimal hand interaction by more automatic visualization procedures. This comprehensive software, offers advanced facilities from pre-operative planning to post-operative documentation.

System supports wide range of data inputs such as CT scan, MRI and fMRI images and fuses them precisely. It has full integration with operation room devices such as endoscope, microscope and different imaging devices.

General Features

  • Perfect design with small footprint and high maneuverability
  • Easy positioning of the large display dedicated to surgeon
  • Virtual key and foot switch to activate predefined system tasks
  • UPS support to continue working in the case of power failure


OV3 has a widespread medical application that has covered different kind of surgeries from a simple biopsy to complicated surgery. Surgical navigation system improves the quality and accuracy of the operations, and makes it possible to reach success in complicated and dangerous surgeries, which have had a lot of mortality before. In the field of neurosurgery surgical navigation system has different applications such as deep brain stimulations (DBS) or tumor dissections. The usage of this technology makes it possible for the surgeon to make sure that the tumor dissected completely without damaging the other healthy tissues. Also in other types of neurosurgery procedures , the desired points are identified easily and the exact position of them is specified during the surgery. Furthermore, in the field of ENT, the application of the navigation technology makes invasive surgeries to occur with less invasiveness and the act of difficult and delicate surgeries take place with much more accuracy and quality than the traditional surgery.

Brain applications

Brain structure is highly complex and it is necessary to approach brain surgery with extreme planning and cautiously to minimize the patient’s risk. The navigation system can be used for:

  • Tumor biopsies
  • Visualization of critical brain structures
  • Tumor resection
  • Skull base tumor resection such as adenoma, chordoma, craniopharyngioma, etc.
  • CSF leak surgery
  • Revision surgeries

Spinal applications

The complex construction of the spine — interconnecting bones and nerve bundles — requires extreme surgical finesse. Spine surgeons often have to calculate within millimeters to ensure the success of the procedure and optimal results for the patient. The navigation system can be used for:

  • Repairing traumatic spinal injury
  • Decompressing nerve roots

Ear/Nose/Throat applications

As with cranial surgery, extreme finesse is required to navigate the many small passages and cavities involved in ENT surgery. The navigation system can be used for:

  • Sinus surgery
  • Cyst and polyp removal
  • Optic nerve decompression
  • Frontal mucocele
  • Skull base surgeries

Import & Manage Image Dataset

  • Support different type of DICOM datasets, e.g. CT, MR and PET
  • Import images from different media, e.g., DVD, CD and memory stick
  • Automatic detection of image dataset’s problems
  • Compatibility check of image datasets to comply with navigation requirements
  • Orientation correction of image dataset
  • Add new image dataset to the existing data intraoperatively



  • Easy to use Visualization tools such as magnifier, rotation and transfer
  • Adjustable images resolution using the Windows level setting, transparency setting, color codes setting and so on
  • Feature to display images in full-size
  • Graphical representation of the patient’s three standard anatomical planes
  • Dynamic toolbars for maximum screen availability
  • Feature to Measure distance

Image Fusion

  • Automatic fusion of images from different image modalities, e.g., CT and MR
  • Accurate and fast fusion, using advanced algorithms
  • Fusion refinement using manually selected landmarks
  • Fusion of image datasets with different voxel size

Segmentation & 3D Reconstruction

  • Automatic and fast segmentation of bone and skin from CT images
  • Easy semi-automatic segmentation of the selected regions
  • Capability to specify the VOI (Volume Of Interest) for segmentation
  • Display sections of 3D models in standard 2D views
  • Capability to define critical anatomical regions to caution during the surgery 
  • Automatic volume calculation of segmented objects

Composite Modeling

  • Fast and easy overlay of fused data and 3D models from different modalities
  • Automatic validity check of the composite model
  • Automatic correction of the composite model based on updated fusion results

Surgical Planning

  • Preoperative simulation of surgical procedure in virtual environment
  • Capability to set and modify target and entry points on 2D images or 3D model
  • Capability to adjust visualization parameters of surgical path, e.g., color and opacity
  • Trajectory animation of surgery approach

Tracking Device & Tool Support

  • Support active and passive surgical instruments
  • Automatic detection and validation & easy calibration of surgical instruments
  • Handy and multiface instruments to facilitate surgical maneuver 
  • Optimal adjustment of tracker’s field of view using laser pointer


  • Display landmark registration error in 2D and 3D model for registration refinement
  • Automatic landmark capturing
  • Automatic evaluation of the new captured landmarks
  • Surface registration to achieve higher registration accuracy
  • Inform final registration error


  • Capability to define check points for intraoperative verification of registration accuracy
  • Dynamic cutting 3D of the model at current position of the tooltip
  • Detect and compensate camera and patient displacement
  • Import and display video images during navigation ,e.g., endoscopic and microscopic images
  • Capability to freeze images in order to review, measure and other operations
  • Audio-visual alarm when the tracker misses the reference or tools
  • Audio-visual alarm when the tooltip approaches to predefine to critical area
  • Intraoperative surgical simulation using virtual tip
  • Real time display of distance between predefined target points and tooltip
  • Auto-measurement of distance from tooltip to arbitrary points
  • 3D distance measurement
  • Auto-snapshot from surgeon’s view of interest

Selected Features

  • Stand alone planning station with all demanded features
  • Unique design to achieve maximum view of display
  • Tracking device with extensive field of view
  • Accurate and fast registration
  • Extensive operation area coverage with two long articulated arms
  • Review of surgery procedures by autosaved information