To meet the requirements of unique applications, NDI offers three types of optical tracking technologies: passive, active, and active wireless. Passive and active wireless tools are tracked by either the Polaris Vicra® or the passive Polaris Spectra® systems, while passive, active wireless, and active tools are tracked by the hybrid Polaris Spectra®
NDI can help you determine the best technology for your application, while considering the following key points and differences of each tool.
*development grade device
Active 4-Marker Planar Rigid Body
Rigid Body 1 – Polaris Vicra only
Rigid Body 2
Rigid Body 3
The Position Sensor emits IR light for passive tracking and also detects active marker positions and calculates transformations of tools and 3D positions of individual markers. The Position Sensor also has indicator LEDs that provide power, status, and error information. The Polaris Spectra® Position Sensor can also contain an optional positioning laser.
The strober is an optional accessory that allows you to connect up to three additional active tools and one GPIO device. Its portability enables tools to be connected close to the work area. A second strober can be daisy-chained to the first to add additional ports. The strober incorporates indicator LEDs to show power, status, and error information. *For use with hybrid spectra
The Polaris® System Control Unit (SCU) is used with the hybrid Polaris Spectra®. It provides the interface between the Position Sensor, strobers and tools, and the host computer. Three active tools can simultaneously be directly connected to the SCU. The SCU also incorporates a GPIO port for connecting other devices, such as a foot switch as well as an expansion port for connecting strobers through which additional active tools and/or GPIO devices may be connected. The SCU incorporates indicator LEDs to show power, status and error information.
Optical tracking is now being used in environments that require markers to be much more robust to liquid and particulate contamination. They also need to be easily cleaned so tracking can quickly be recovered. The NDI Radix™ Lens has been designed to respond to these demands. Designed for use with the Polaris® and the Polaris® Spectra Systems, the Radix Lens has a smooth plastic surface that naturally sheds liquid and is easy to wipe clean to recover tracking. The Radix Lens also has the unique characteristic of being inherently resistant to partial occlusions, further enhancing its robust performance characteristics. Features of the NDI Radix Lens include:
The Radix Lens has the unique characteristic of being inherently resistant to partial occlusions. For passive spheres, partial occlusions generally cause a tool to stop tracking. A partial occlusion covering one side of a Radix Lens will be reflected on the opposite side. Due to this symmetrical occlusion, there is little effect on the marker centroid and therefore tracking loss is less likely.
The Radix Lens has a maximum marker angle of +/- 70°.
In contrast to the NDI passive sphere, the Radix™ Lens is not used directly in the form that it is supplied. The Radix Lens must first be incorporated into a tool or mounting base so that it may be attached to a passive tool. Please contact NDI for details regarding integration of the Radix Lens with passive tools.
*Radix Lens’ are not a standard medical device.