Polaris Features

The following is an overview of the benefits offered by the Polaris Spectra and Polaris Vicra optical measurement systems. Unless noted, all features apply to both systems.

Exceptional Accuracy

  • Advanced tracking algorithms provide exceptional accuracy
  • Optional Accuracy Assessment Kit (AAK) available to perform quick, in-field accuracy assessments

Multiple Measurement Volumes

The measurement volume is the area in which the tool is tracked (within NDI accuracy specifications).

Polaris Spectra Polaris Vicra

Polaris Spectra comes equipped with the Pyramid Volume or an optional Extended Pyramid Volume

Polaris Spectra comes equipped with the Pyramid Volume or an optional Extended Pyramid Volume

Polaris Vicra comes equipped with the Vicra Volume

Polaris Vicra comes equipped with the Vicra Volume

Short Warm-Up Time

  • Maximum warm-up time of only ten minutes required to begin reliable, accurate tracking

Shock Alert

  • Bump detector warns if the system has experienced a significant shock
  • System warning recommends performing an AAK to check system accuracy

Wide Temperature Operating Range

  • Measure accurately within an ambient temperature range of +10°C to +40°C for Polaris Spectra and +10°C to +30°C for Polaris Vicra
  • No adjustments required to achieve this range

Positioning Laser (Polaris Spectra)

  • Polaris Spectra can be equipped with an optional integrated positioning laser
  • Laser assists in aligning the position sensor with the area of interest

Compact and Lightweight

  • Polaris Vicra Position Sensor dimensions are 273 mm x 69 mm x 69 mm (LxWxH) and weighs only 0.80 kg
  • Small size allows position sensor to be fixed directly to the patient table or integrated into a hardware system

Small Tool Geometries (Polaris Vicra)

  • New generation of tools are also small and lightweight
  • Polaris Vicra can track smaller tools, compared to the current Polaris System
  • Allows surgical instruments tracked by Polaris Vicra to be ergonomically smaller and lighter than those in current use

Robust

  • Mechanically durable and able to withstand the elements of medical application environments
  • Absorbs impact sustained from relocating the system

Maintenance and Diagnostics

  • Quick and easy-to-use troubleshooting utilities
  • Simple interface for basic data collection
  • Effortless background interference detection

Easy Integration

  • The Application Program Interface (API) allows for easy application-specific software development
  • The Application Program Interface is a built-in set of approximately 60 commands used to control the Polaris
  • The Polaris uses parameters to set values and alerts including bump status, temperature and hardware faults

Active and Passive Tracking

All Polaris systems can track active and passive tools. Polaris Vicra and passive Polaris Spectra track passive and active wireless tools only. The hybrid Polaris Spectra tracks active, passive, and active wireless tools.NDI research has shown that active and passive marker tracking is equivalent in terms of accuracy. For further information about these studies, read Accuracy Assessment and Interpretation for Optical Tracking Systems PDF (published in SPIE Medical Imaging).

Support

Access to NDI’s exceptional service and support is included with every Polaris Spectra and Polaris Vicra system. Part of NDI’s ongoing support also includes 24-hour access to NDI’s Support Site – a secure online resource, providing up-to-date information about NDI products and services.For support, email support@ndigital.com.

Top

Polaris Systems

Choosing a Polaris System

The Polaris Spectra and Polaris Vicra are based on the same core technology. Consider these factors when choosing a Polaris system for your application:

  • Size of measurement volume needed
  • Update rate required for tracking
  • Number and type of tools to be tracked
  • Space restrictions and mounting location of system
  • Integration/compatibility with current Polaris system

For further differences and similarities between the Polaris Spectra and the Polaris Vicra, see the table below.

Product Features Polaris Spectra Polaris Vicra
exceptional accuracy Yes Yes
bump detection capabilities Yes Yes
robust Yes Yes
short warm-up time Yes Yes
maintenance and diagnostic utilities Yes Yes
accurate within wide temperature range Yes Yes
large measurement volume Yes
integrated positioning laser Yes
small and lightweight Yes
mount almost anywhere Yes
track passive tools Yes Yes
track active wireless tools Yes Yes
track active tools Yes

Configurations

There are three Polaris System configurations available: passive hybrid  Polaris Spectra System, Passive Polaris Spectra System, and Polaris Vicra System. See Choosing a Polaris for help choosing the correct system for your applications.

Hybrid Polaris Spectra System Passive Polaris Spectra System Polaris Vicra System

Hybrid Polaris Spectra System

The hybrid Polaris Spectra System can measure active, active wireless, or passive tools. It consists of a Position Sensor, a System Control Unit (SCU), optional strobers, and cables.

Passive Polaris Spectra System

The passive Polaris Spectra System can measure active wireless or passive tools. It consists of a Position Sensor, a Host USB Converter, a power adapter, and cables.

Polaris Vicra System

The Polaris Vicra System has a smaller measurement volume than the Polaris Spectra and can measure active wireless or passive tools. The Polaris Vicra System consists of a Position Sensor, a Host USB Converter, a power adapter, and cables.

Software

The following are the software utilities available for the Polaris Spectra and Polaris Vicra optical tracking systems. The NDI Polaris Spectra and Polaris Vicra Systems come complete with NDI ToolBox software and an application program interface (API).

NDI ToolBox
NDI ToolBox is a suite of utilities for diagnostics, maintenance, testing, and development support for the Polaris Spectra and Polaris Vicra Systems. (View PDF) Some of the utilities offered through NDI Toolbox include:
Configure Utility
  • View system configuration
  • Change/update system settings
  • Quickly identify issues
ToolTracker Utility
  • See where a tool is located within the measurement volume
  • Perform data collection
  • View the size, shape, and boundaries of the measurement volume
Image Capture Utility
  • Easily view marker location
  • Examine background for potential interference
NDI 6D Architect
  • NDI 6D Architect is a software tool that simplifies the tool characterization process and the creation of tool definition files.
  • The program makes it easy to transform and manipulate information, including the view, orientation, and renaming of the markers within the 6D Architect main window. (View PDF)
Application Program Interface (API)
  • The API follows the proven and well accepted Polaris API and is fully compatible with Polaris Firmware Rev 2X.
  • The API enables easy system integration into your specific applications. (View PDF)
Top

Polaris Specifications

Hybrid Polaris Spectra® Passive Polaris Spectra® Polaris Vicra®
Performance
Accuracy:
Volumetric1,2 Pyramid: 0.25 mm RMS Extended Pyramid: 0.30 mm RMS2 0.25 mm RMS
AAK 0.35 mm RMS 0.35 mm RMS
95% Confidence Interval Pyramid: 0.5 mm Extended Pyramid: 0.6 mm 0.5 mm
Maximum Update Rate3 60 Hz 20 Hz
Operating Temperature4 10C° to 40°C 10°C to 30°C
Measurement Volume Pyramid and Extended Pyramid Vicra Volume
Data Communication Interface
Interface USB 1.1 and 2.0 compatible, RS-232 or RS-422 with SCU USB 1.1 and 2.0 compatible USB 1.1 and 2.0 compatible
Maximum data rate 1.2 Mb per second 1.2 Mb per second 1.2 Mb per second
Tools
Tool Types Passive, active wireless, active Passive, active wireless Passive, active wireless
Maximum number of tools Up to 15 wireless tools (maximum 6 active wireless) with a maximum of 32 passive and 32 active markers in view and up to 9 additional active tools Up to 15 wireless tools (maximum 6 active wireless) with a maximum of 32 passive and 32 active markers in view Up to 6 tools (maximum 1 active wireless) with a maximum of 32 passive markers in view
Maximum number of markers per tool 6 single-face/20 multi-face for passive or active wireless tools; 20 for active tools 6 single-face/20 multi-face for passive or active wireless tools 6 single-face/20 multi-face for passive or active wireless tools
Tool change Automatic for active; software controlled for passive and active wireless Software controlled Software controlled
Power
Power Requirements 100/120/220/240 V AC, ~50/60 Hz, 0.5 A 100-250 V AC ~50/60 Hz, 1 A 100-250 V AC ~50/60 Hz, 1 A
Laser
Positioning Laser

Class 2 laser, Wavelength – 635 nm, Maximum output – 1 mW

laser_label_polaris

Not available
Approvals
The Polaris System is designed and tested to meet the following electrical safety and electromagnetic compatibility standards:
Electrical Safety

EN 60601-1:2006 +AC:2010 / IEC 60601-1:2005 +C1:2006 +C2:2007
ANSI/AAMI ES60601-1:2005 +C1:2009 +A2:2010
CAN/CSA-C22.2 No. 60601-1-08

Electromagnetic Compatibility EN 55011:2009 +A1:2010 / CISPR 11:2009 +A1:2010
FCC Title 47 CFR, Part 15 (2010)
ICES-001, Issue 4 (2006)
EN 60601-1-2:2007 / IEC 60601-1-2:2007 (Modified)
JIS T 0601-1-2:2002

Mechanical Specifications

Hybrid Polaris Spectra® Passive Polaris Spectra® Polaris Vicra®
Position Sensor
    Dimensions (LxWxH) 613 mm x 104 mm x 86 mm 273 mm x 69 mm x 69 mm
    Weight 1.9 kg 0.80 kg
    Mounting Secured via four M4 x 0.7 mm pitch x 8.7 mm deep threaded holes, rear mount 1/4″ thread tripod mount or secured via three M3 x 0.5 mm pitch x 6.5 mm deep threaded holes, rear mount
Host USB Converter
    Dimensions (LxWxH) 88 mm x 57 mm x 39 mm 88 mm x 57 mm x 39 mm
    Weight 0.35 kg 0.35 kg
    Mounting Free standing or secured via three M6 x 1 mm pitch x 3 mm deep threaded holes, located in the mounting feet Free standing or secured via three M6 x 1 mm pitch x 6 mm deep threaded holes, located in the mounting feet
System Control Unit (SCU)
    Dimensions (LxWxH) 231 mm x 220 mm x 88 mm
    Weight 3.5 kg
    Mounting Free standing or mounted via four M4 x 0.7 mm pitch x 7.0 mm deep threaded holes on the bottom or sides. Rubber feet on the bottom of the SCU may be moved to the thread holes on the side of the SCU.
Tool Strober
    Dimensions (LxWxH) 182 mm x 102 mm x 35 mm
    Weight 0.4 kg
    Mounting Free standing or mounted via two M3 x 0.5 pitch x 5 mm deep threaded holes on the bottom

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. 2 Accuracy stated based on overall volume. 3 Varies according to tool combinations with a maximum rate of 60 Hz. 4 If the Host USB Convertor (HUC) is located within the patient vicinity where it may be touched by the patient, the operating ambient temperature range is +10°C to +30°C. If the HUC is located outside this patient vicinity, the operating ambient temperature range permitted for the system is +10°C to +40°C. The power supply unit must be located outside the patient vicinity under all operating conditions.

Measurement Volume

The measurement volume is the region in which tools can be tracked.

Polaris Spectra Polaris Vicra
Polaris Spectra Measurement Volume Polaris Vicra Measurement Volume

 

Top

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
Top

Polaris Applications

Trusted by medical device manufacturers worldwide, more than 11,000 Polaris systems are used in a variety of surgical applications, delivering accurate, flexible, and reliable measurement solutions that are easily customized to specific applications. Polaris has a long history of serving the needs of leading-edge research institutions, innovators, and medical device manufacturers around the world.

Polaris: the core 3D measurement technology inside the world’s leading computer-assisted surgery and therapy systems.

Examples of applications using Polaris optical tracking include:

Top

Polaris Brochure

Polaris Brochure Request
Top