Polaris Vega® and Polaris Vicra®Comparison

The Polaris Vega and Polaris Vicra share the same trusted optical measurement performance; where they differ is their size and accuracy. The larger Polaris Vega provides tracking of larger OEM surgical instruments within a larger measurement volume. It has a measurement rate that is—at a minimum— triple that of the Polaris Vicra (depending on the Polaris Vega model). The volumetric accuracy of the Polaris Vega is also two times more accurate than the Polaris Vicra.

The Polaris Vicra’s small size and measurement volume make it a powerful optical measurement solution for tracking smaller tools within confined areas. The compact form factor of the Polaris Vicra® also allows it to be mounted almost anywhere on the OEM medical system, or within the operative suite.


Polaris Vega XT

Pyramid Volume (RMS)

Polaris Vicra

Vicra Volume (RMS)

Volumetric Accuracy1,20.12 mm0.25 mm
95% Confidence Interval1,20.20 mm0.50 mm
Maximum Frame Rate400 Hz20 Hz
Measurement VolumePyramid
Extended Pyramid (optional)


Polaris Vega XT

Polaris Vicra

Dimensions (LxWxH)591 x 103 x 106 mm273 x 69 x 69 mm
Weight1.7 kg0.8 kg
MountingFour M4 x 0.7 mm pitch x 10 mm deep threaded holes, rear mount¼” thread tripod mount or secured via three M3 x 0.5 mm pitch x 9.0 mm deep threaded holes, rear mount

Tool Tracking

Polaris Vega XT

Polaris Vicra

Tool Types Passive, Active WirelessPassive, Active Wireless
Maximum Number of Tools Load up to 25 tools (maximum of 6 active wireless)Load up to 15 tools; simultaneously track up to 6 passive and 1 active wireless
Maximum Number of Markers per Tool 6 single-face/20 multi-face6 single-face/20 multi-face

Data Communication

Polaris Vega XT

Polaris Vicra

Data Communication Gigabit EthernetUSB
Network Synchronization Precision Time Protocol (PTP)N/A
Data/Power Interface Ethernet, RJ45Host USB Convertor

*Example of an original equipment manufacturer’s use of Polaris in its medical device system.
1Based on a single marker stepped through more than 900 positions throughout the measurement volume using the mean of 30 samples at each position at 20°C.
2Accuracy stated based on overall volume.

Polaris Vega® and Polaris Vicra®

Polaris Vega

NDI’s advanced optical measurement solution with three models of optical trackers that deliver unrivalled measurement performance and versatility for emerging OEM surgical navigation applications.

Polaris Vicra

Bring exceptional measurement accuracy and reliability to confined tracking areas with our compact optical tracker: Polaris Vicra.

Navigate New Possibilities

NDI stays the course with its partners, ensuring that they get to market faster. We understand that system design is only one piece of your complex path to market. Through our dedicated account management, integration, and technical support teams, we invest in all stages of the product development life cycle- from initial concept creation, through subsystem design, cost, performance optimizations, and the critically important high-volume factory calibration process.

Technology Overview

NDI’s optical measurement solutions, Polaris Vega and Polaris Vicra, use near-infrared (IR) light to wirelessly detect and track navigation markers attached to OEM surgical instruments.


NDI’s optical measurement and electromagnetic tracking solutions can be tailored to your unique tracking application through diverse customization and integration options.


Learn more about NDI’s optical measurement and electromagnetic tracking solutions through our collection of videos, articles and datasheets. Navigate the possibilities for your unique OEM surgical instrument.

Legal Disclaimer
NDI tracking and measurement products are general metrology components that can be integrated into customer products, research experiments, and/or as components of medical devices that require precision measurement and tracking. While NDI components and technology can be integrated into original equipment manufacturer (OEM) medical devices, they are not specifically intended for a given application and, as such, have not been developed or manufactured in accordance with medical device standards. It remains the responsibility of the OEM customer or end-user to determine and test the suitability of NDI components and technology for their intended use, including performing any required ethics approval, verification, and validation required to demonstrate suitability and compliance. System-level testing, certification, and validation are the responsibility of the original equipment manufacturer or the applicable end-user and should be completed prior to the use of NDI products or technologies in any application.