Import EEG channel MR-based positions

Discussions
,
1

Dear Brainstorm users

I am new to Brainstorm and I try to import an electrode position file obtained form the SPOT3D toolbox (NITRC: SPOT3D: Spatial positioning toolbox for head markers using 3D scans: Tool/Resource Info). This toolbox performs automatic sensor positioning in the MR space of the subject's T1. The EEG data have been acquired with a 128 channel ActiCHamp (BrainProducts) system. The 3D scans have been acquired with structure sensor camera and Skanect 3D software from Occipital Inc. (Boulder, CO, USA).

The data look like this:

FP1 -27.4892912377897 94.4512112125323 65.9800069792319
FZ 6.89691633191147 68.6037563574251 118.780586505641
F3 -45.6297007183995 60.6814310855743 101.585990724873
F7 -68.8671738105541 56.6813695976393 55.1259596444203
FT9 -73.2984652026627 30.0101038319897 26.2208960480180
FC5 -69.7689064991003 34.2898108911136 84.6821024243082
FC1 -23.7062208006232 35.2353989047931 128.747897517368
C3 -55.9641735169308 1.69771247358293 112.400545511285
T7 -76.3107411463679 1.67966291855379 56.9264888987411
AF7 -51.2994988917404 78.8692545520532 60.7280124458779
AF3 -27.8215467997697 83.7961109904724 92.4892811092881
AFZ 3.77225971791046 86.9745630794615 99.2886359535350
F1 -20.6892659924715 62.6641306423489 116.639535678918
F5 -56.8595959266095 65.0501000261494 78.7797973383243
FT7 -74.0624265589265 34.0053731474622 54.6200699050319
......
CCP4H 58.3756671055711 -18.3735130699851 120.017036287578
TTP8H 85.8630793968519 -15.6152477056158 61.5170421617054

Many thanks for your help

2

These coordinates seem to the in the RAS space. Can you confirm this? If so,

  1. Save the position in a TSV file with the file name:
    SOMETHING_electrodes.tsv
  2. Import the electrode position with the format:
    EEG: BIDS electrodes.tsv, subject space mm (*.tsv)
1 Like