Polaris Technology

The goal of optical measurement is to calculate the location and orientation of an object or tool within a defined coordinate system. Optical tracking uses a position sensor to detect infrared-emitting or retro-reflective markers affixed to a tool or object. The position sensor calculates the position and orientation of the tool based on the information the position sensor receives from those markers. There are two types of markers that can be used in optical tracking, including:

  • Active Markers: Infrared-emitting markers that are activated by an electrical signal.
  • Passive Markers: Spherical, retro-reflective markers that reflect infrared light, emitted by illuminators on the position sensor.

NDI’s Polaris Spectra and Polaris Vicra use optical measurement and are integrated into medical solutions that have been widely adopted for use in computer-assisted therapy applications ranging from implant placement to radiation therapy to ergonomic studies to neurosurgery.

Advantages offered by NDI’s Polaris Family of optical tracking products, include:

  • Large working volume
  • Very small, portable solutions
  • Ability to track either or both active and passive markers
  • High degree of measurement accuracy (up to 0.3mm RMS)
  • Measures accurately within a large operating temperature range
  • Ability to perform quick in-field accuracy assessment