BIOSEMI 128 10-5 Channel File

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1

I've been trying to create a channel file that fits with the default anatomy provided by Brainstorm for the BIOSEMI 128 10-5 system. I looked through the default templates in Brainstorm, and only found the channel locations for the 10-10 system but not the 10-5 system.

I had previously found a 10-5 channel file (here) that was very poorly aligned to the Brainstorm head surface, so I coded a least-squares optimization model to perform affine transformations mapping certain electrodes in this misaligned file to the corresponding ones in the official 10-10 channel file (e.g. Cz, Fpz, Oz, T7, T8). I was able to get the following fit:
Distance between 128 head points and head surface:
| Mean : 2.4 mm | Distance > 3mm: 40 points (31%)
| Max : 9.3 mm | Distance > 5mm: 10 points ( 8%)
| Std : 1.8 mm | Distance > 10mm: 0 points ( 0%)
but was wondering if anyone else had access to a better 10-5 channel file.
I am also attaching a screenshot of the fit on the head surface (it is still visibly misaligned)

image
image1919×598 58.8 KB

Any help would be greatly appreciated.

2

Once you have the 128 EEG channel file (after importing your data), check that the names correspond to the 10-05 system, then you could use the Generic EEG positions for the Default anatomy (ICBM152) and the 10-05 system.

Right-click the channel file > Add EEG positions > ICBM 152 > Generic > ASA 10-05 343

3

Thank you very much for the help!