Locator
When used together with Polhemus™ digitizing hardware, LOCATOR allows you to measure accurately electrode locations an external head shape in 3 dimensions. These data may then be used for MRI coregistration and more accurate source estimation. LOCATOR currently supports three Polhemus products: ISOTRAK, FASTRAK, and PATRIOT.*
Functionality
3D Digitization
- Electrode locations may be determined by touching with a stylus. Head movement is automatically compensated with 1-3 head mounted sensors.
- External head shape locations may be determined by “drawing” over the head surface with a stylus. Head movement is automatically compensated with 1-3 head mounted sensors. Location of named points (such as nasion, inion, etc) may be obtained and stored.
- BESA, Curry, and EMSE formats are supported.*
- Other sensors (including optical sensors and magnetic sensors) may also be digitized.
- Setup functions for Polhemus hardware (PATRIOT and FASTRAK) are available through the LOCATOR menu.
Display
- Interactive 3D display permits viewing of digitized points as they are added or offline. A manual editing function allows error correction.
Input/Output
- User Interface. A conventional Microsoft Windows style graphical user interface is used throughout.
- Audio prompt allows you to digitize electrodes from a sequence file without looking at the screen.
Intermodule Communication
- Input: None
- Output: Measured locations may be used for 3D rendering of sensors on a head surface in VISUALIZER, and for source estimation in SOURCE ESTIMATOR.
File I/O
- Input: ASCII setup files may be used to store commonly used sequences (e.g. electrode names).
- Output: ASCII (EMSE format) probe and headshape files; BESA and Curry ASCII export formats*
Other I/O
- Graphics may be transferred to clipboard for use by other graphics programs or for insertion into word processors.
Documentation
- Printed. User manual, including file formats.
- Online documentation is bundled with the software.

Digitizing electrode positions in Locator.

Head surface points and rendered surface.

Visualization of electrode position data.
Requirements | minimum required | recommended |
CPU | Laptop-grade Intel or AMD processor | |
RAM | 512 Mbyte | |
Port | RS232 serial port or USB port with an included USB-to-serial adaptor | |
Operating System | Windows XP/7/8 | Windows 7 |
Display | SVGA | |
Installation medium | CD-ROM or web package installer | |
Other hardware | Polhemus Isotrak*, Fastrak* & Patriot* | |
Input modules | none |