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Related Experiment Video

Updated: Mar 24, 2026

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MinR 10/20 system: Quantitative and reproducible cranial landmark setting method for MRI based on minimum initial

Daisuke Tsuzuki1, Hama Watanabe2, Ippeita Dan3

  • 1Information Science and Technology Department, National Institute of Technology, Yuge College, 1000 Shimoyuge, Yuge, Kamijima-cho, Ochi-gun, Ehime 794-2593, Japan; Functional Brain Science Laboratory, Jichi Medical University, 3311-1 Yakushiji, Shimotsuke, Tochigi 329-0498, Japan.

Journal of Neuroscience Methods
|March 7, 2016
PubMed
Summary

The MinR 10/20 system offers a practical alternative for electroencephalography (EEG) landmark localization, simplifying cranial positioning for brain mapping. This method reduces variability compared to the international 10/20 system, especially when the inion is difficult to identify on MRIs.

Keywords:
Cranial landmark settingHead positionsHuman brain mappingInter-modal data sharingInternational 10/20 systemMRI

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Area of Science:

  • Neuroimaging
  • Biomedical Engineering
  • Computational Neuroscience

Background:

  • The international 10/20 system is a standard for electroencephalography (EEG) electrode placement and cranial landmark identification.
  • Locating the inion, a key landmark in the international 10/20 system, can be challenging on MRI scans.
  • Accurate landmark identification is crucial for probabilistic spatial registration methods using MRI databases.

Purpose of the Study:

  • To introduce and evaluate the MinR 10/20 system as a practical alternative to the conventional international 10/20 system.
  • To assess the reliability and variability of landmark positioning using the MinR 10/20 system.
  • To determine if the MinR 10/20 system simplifies cranial landmark identification for EEG and brain mapping.

Main Methods:

  • The MinR 10/20 system uses the nasion (Nz) and preauricular points (AR, AL) as primary landmarks, omitting the inion (Iz).
  • An alternative posterior occipital point, IIz (Imitated Iz), is identified as a substitute for the inion.
  • Landmarks are calculated using conventional international 10/20 system principles based on these four reference points (Nz, AL, AR, IIz).
  • The MinR and international 10/20 systems were compared on seventeen adult head MRIs.

Main Results:

  • Holistic tendencies for landmark position estimations in MNI space showed minimal variation between the MinR and international 10/20 systems.
  • The MinR 10/20 system demonstrated smaller variability in landmark position estimations compared to the conventional international 10/20 system.
  • This suggests improved consistency in landmark localization with the MinR 10/20 system.

Conclusions:

  • The MinR 10/20 system is a practical and effective alternative for cranial landmark localization in EEG and scalp-based brain mapping.
  • It offers reduced variability and simplifies the process, particularly when the inion is difficult to discern on MRIs.
  • This method enhances the reliability of computational spatial analysis in neuroimaging.