Difference between revisions of "Importing Digitized Coordinates"
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Revision as of 12:55, 12 May 2016
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 &arr; Head Surface Points and Sensors &arr; Load Coordinate Files" (use 'CTRL-L' key on the keyboard).
You can check on the correct reading of the file using the View Head Surface points window (menu "File &arr; Head Surface Points and Sensors &arr; View" or 'V' on the keyboard).
