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[FIX] Remove BESA from list of restricted keywords of EEG coordsystems #457

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Apr 28, 2020
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[FIX] Remove BESA from list of restricted keywords of EEG coordsystems #457

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9 changes: 1 addition & 8 deletions src/99-appendices/08-coordinate-systems.md
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Expand Up @@ -71,18 +71,11 @@ detailed extensive descriptions of these EEG coordinate systems on the
Restricted keywords for the `XXXCoordinateSystem` field in the
`coordsystem.json` file for EEG datasets:

- `BESA`: Although natively this is a spherical coordinate system, the
electrode positions should be expressed in Cartesian coordinates, with a RAS
orientation. The X axis is the T8-T7 line, positive at T8. The Y axis is the
Oz-Fpz line, positive at Fpz. The origin of the sphere fitted to the
electrodes is approximately 4 cm above the point between the ears.

- `Captrak`: RAS orientation and the origin between the ears

Note that the short descriptions above do not capture all details, There are
detailed extensive descriptions of these EEG coordinate systems on the
[FieldTrip toolbox web page](http://www.fieldtriptoolbox.org/faq/how_are_the_different_head_and_mri_coordinate_systems_defined)
and on the [BESA wiki](http://wiki.besa.de/index.php?title=Electrodes_and_Surface_Locations#Coordinate_systems).
[FieldTrip toolbox web page](http://www.fieldtriptoolbox.org/faq/how_are_the_different_head_and_mri_coordinate_systems_defined).

## iEEG Specific Coordinate Systems

Expand Down