Photogrammetry-Based Head Digitization for Rapid and Accurate Localization of EEG Electrodes and MEG Fiducial Markers Using a Single Digital SLR Camera

Clausner, Tommy; Dalal, Sarang S.; Crespo-García, Maité

Photogrammetry-Based Head Digitization for Rapid and Accurate Localization of EEG Electrodes and MEG Fiducial Markers Using a Single Digital SLR Camera

Dateien

Clausner_0-410790.pdfGröße: 3.52 MBDownloads: 338

Datum

2017

Autor:innen

Clausner, Tommy

Dalal, Sarang S.

Crespo-García, Maité

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Psychologie

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Frontiers in Neuroscience. 2017, 11, 264. ISSN 1662-4548. eISSN 1662-453X. Available under: doi: 10.3389/fnins.2017.00264

Zusammenfassung

The performance of EEG source reconstruction has benefited from the increasing use of advanced head modeling techniques that take advantage of MRI together with the precise positions of the recording electrodes. The prevailing technique for registering EEG electrode coordinates involves electromagnetic digitization. However, the procedure adds several minutes to experiment preparation and typical digitizers may not be accurate enough for optimal source reconstruction performance (Dalal et al., 2014). Here, we present a rapid, accurate, and cost-effective alternative method to register EEG electrode positions, using a single digital SLR camera, photogrammetry software, and computer vision techniques implemented in our open-source toolbox, janus₃D. Our approach uses photogrammetry to construct ₃D models from multiple photographs of the participant's head wearing the EEG electrode cap. Electrodes are detected automatically or semi-automatically using a template. The rigid facial features from these photo-based models are then surface-matched to MRI-based head reconstructions to facilitate coregistration to MRI space. This method yields a final electrode coregistration error of 0.8 mm, while a standard technique using an electromagnetic digitizer yielded an error of 6.1 mm. The technique furthermore reduces preparation time, and could be extended to a multi-camera array, which would make the procedure virtually instantaneous. In addition to EEG, the technique could likewise capture the position of the fiducial markers used in magnetoencephalography systems to register head position.

Fachgebiet (DDC)

150 Psychologie

Schlagwörter

photogrammetry, 3D models, EEG, MEG, coregistration, electrode position, janus3D

Zitieren

ISO 690

CLAUSNER, Tommy, Sarang S. DALAL, Maité CRESPO-GARCÍA, 2017. Photogrammetry-Based Head Digitization for Rapid and Accurate Localization of EEG Electrodes and MEG Fiducial Markers Using a Single Digital SLR Camera. In: Frontiers in Neuroscience. 2017, 11, 264. ISSN 1662-4548. eISSN 1662-453X. Available under: doi: 10.3389/fnins.2017.00264

BibTex

@article{Clausner2017-05-16Photo-39328,
  year={2017},
  doi={10.3389/fnins.2017.00264},
  title={Photogrammetry-Based Head Digitization for Rapid and Accurate Localization of EEG Electrodes and MEG Fiducial Markers Using a Single Digital SLR Camera},
  volume={11},
  issn={1662-4548},
  journal={Frontiers in Neuroscience},
  author={Clausner, Tommy and Dalal, Sarang S. and Crespo-García, Maité},
  note={Article Number: 264}
}

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