Importing Digitized Coordinates

Module information
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 ‘FidT9’, ‘FidT10′, FidNz’, 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	-4.30
FidT9 -0.61	-7.78	-5.24
FidT10 -0.70	7.34	-5.86
E1 -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 dialog "Channel and digitized head surface point information" 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 View Head Surface points window (menu "File → Head Surface Points and Sensors → View" or "V" on the keyboard).

See also the article Verify Electrode Coordinates.