Exporting Artifact-Corrected Data
|Modules||BESA Research Basic or higher|
|Version||6.0 or higher|
Artifact corrected data can be exported for further analysis in third party software. It is essential to keep in mind that this data will always suffer from some level of distortion. For that reason some earlier versions of BESA would even block some modalities of file export.
Choosing the Artifact-Correction Method
BESA 6.0 onwards provides four different artifact correction possibilities: ICA, adaptive, surrogate and SSP (see the BESA manual or the BESA Research tutorial for more details latest BESA tutorial).
The adaptive method, also known as PCA-correction, is computed separately for each screen. This is the best correction method when looking through your data. However it might present discontinuities at the end or beginning of each page. The other methods instead correct the whole data set at once. Therefore it is recommended that you use one of these when exporting your artifact-corrected data. Furthermore we strongly recommend you use the ICA or surrogate method rather than the SSP method, as the latter typically causes the largest distortions.
Exporting the Artifact-Corrected Data
After having applied the artifact correction:
- Go to File → Export.
- To enable the artifact correction you should select the option "Current filters and current baseline for segments settings" in "Montage and Filters" section.
- Choose the a format in "Target data formats" section. Say BESA binary.
- Press Ok to start the export.
Please note that the exported binary will have the usual "corrected" text on the upper right hand corner of the traces screen. It will however be marked red. The artifact correction can no longer be reversed at this stage. Furthermore BESA will not allow a further artifact correction to be attempted on this already corrected file.
Although this is not recommended, you can trick BESA into forgetting that artifact correction was done by for example exporting it to other formats such to ASCII multiplexed.