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.