Improved EEG source localization employing 3D sensing by flying triangulation

Svenja Ettl, Stefan Rampp, Sarah Fouladi-Movahed, Sarang S. Dalal, Florian Willomitzer, Oliver Arold, Hermann Stefan, Gerd Häusler

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Scopus citations


With electroencephalography (EEG), a person's brain activity can be monitored over time and sources of activity localized. With this information, brain regions showing pathological activity, such as epileptic spikes, can be delineated. In cases of severe drug-resistant epilepsy, surgical resection of these brain regions may be the only treatment option. This requires a precise localization of the responsible seizure generators. They can be reconstructed from EEG data when the electrode positions are known. The standard method employs a digitization pen and has severe drawbacks: It is time consuming, the result is user-dependent, and the patient has to hold still. We present a novel method which overcomes these drawbacks. It is based on the optical Flying Triangulation (FlyTri) sensor which allows a motion-robust acquisition of precise 3D data. To compare the two methods, the electrode positions were determined with each method for a real-sized head model with EEG electrodes and their deviation to the ground-truth data calculated. The standard deviation for the current method was 3.39 mm while it was 0.98 mm for the new method. The influence of these results on the final EEG source localization was investigated by simulating EEG data. The digitization pen result deviates substantially from the true source location and time series. In contrast, the FlyTri result agrees with the original information. Our findings suggest that FlyTri might become a valuable tool in the field of medical brain research, because of its improved precision and contactless handling. Future applications might include co-registration of multimodal information.

Original languageEnglish (US)
Title of host publicationVideometrics, Range Imaging, and Applications XII; and Automated Visual Inspection
StatePublished - 2013
EventVideometrics, Range Imaging, and Applications XII; and Automated Visual Inspection - Munich, Germany
Duration: May 14 2013May 16 2013

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceVideometrics, Range Imaging, and Applications XII; and Automated Visual Inspection


  • Electrode localization
  • Electroencephalography (EEG)
  • Flying Triangulation
  • Handheld device
  • Medical applications
  • Motion robust
  • Optical 3D metrology
  • Source analysis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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