Importing Digitized Coordinates
|Modules||BESA Research Basic or higher|
|Version||5.2 or higher|
How do I import digitized electrode coordinates and head surface points
Digitized electrode locations can be provided in a surface point file (extension *.sfp) in ASCII format. It is recommended that the first three digitized coordinates are the fiducials (fiduciary points), labeled FidNz, FidT9, FidT10, followed by electrodes, and possibly additional skin points. A detailed description of the file and how to import it is given in the BESA help files (chapter: Working with Electrodes and Surface Locations).
An example sfp file could look like this:
FidNz -10.89 0.04 -4.30FidT9 -0.61 -7.78 -5.24FidT10 -0.70 7.34 -5.86E1 -1.52 -2.31 6.98 E2 -1.65 -7.67 2.54 E3 -4.26 -8.31 -3.86 ...
The file is read in using the Channel and digitized head surface point information dialog in menu "File → Head Surface Points and Sensors → Load Coordinate Files" (use CTRL-L key on the keyboard).
How do I check the result
You can check on the correct reading of the file using the Surface points window (menu "File → Head Surface Points and Sensors → View" or V on the keyboard).
See also the article Verify Electrode Coordinates.