Geodesic Sensor Nets

You and your patients will love the easy, comfortable Geodesic Sensor Nets!
  • fast application of 32 to 256 sensors
  • no scalp abrasion or glues
  • no sedation or restraints, even on children with behavioral challenges
  • provides a "whole head” view of scalp electrical activity


EGI's Geodesic EEG System product line


a component of EGI's Geodesic EEG System

Geodesic Sensor Nets are available as components of EGI's Geodesic EEG System (GES) products.

High Density EEG and Desensitization Techniques Improve Compliance Without Sedation or Restraint for Children and Adults with Behavioral Challenges

Improving patient compliance for EEG

Poster presented at the ASET 2016 Conference by Szklarski, Mintz, and Catterall.

View the poster.

The Geodesic Sensor Net (GSN) has been widely adopted by the clinical and clinical research community because of its ease of use, comfort, and ability to produce high-quality and high-resolution data.

Geodesic Sensor Nets are available in various styles optimized for applications from routine EEG exams recordings to long term monitoring and multimodal research applications.

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Preterm infant EEG Sensor Net

HydroCel GSN 130, preterm infant sizes
  • developed specifically for the head shape and sensitive skin of preterm infants
  • no face straps, simplifying application, minimizing stress for infants, and making it less likely to interfere with other medical devices
  • Available in 32, 64, and 128 channel counts
  • Available in small (28–30 cm), medium (30–32 cm) and large (32–34 cm) sizes
HydroCel GSN 130, routine
  • Fastest application of all Net designs
  • For routine EEG up to 2 hours
  • Uses sponges and a saline solution instead of glues and gel
  • Available in 32, 64, 128, and 256 channel counts
  • Sizes from neonate to adult

HydroCel GSN 130, LTM

  • MicroCel EEG electrode netFor EEG exams over 2 hours in duration
  • Sensors are housed in soft pedestals without sponges
  • Uses standard paste, added to pedestals after Net application
  • Available in 32, 64, 128, and 256 channel counts
  • Sizes from pediatric to adult

MicroCel Geodesic Sensor Net

  • Very low profile for use in EEG-TMS or EEG-MEG research
  • No sponges or saline; use with gel or paste
  • Ideal for larger head sizes, which often are difficult to fit into the MEG
  • Available in 32, 64, 128, and 256 channel counts
  • Available in adult sizes from small to extra large


Infant EEGSuperior Patient Comfort
In study after study, patients report that they prefer EEGs performed with Geodesic Sensor Nets over conventional EEG sensors. Patients report that GSNs are more comfortable than other EEG methods. Children are far less likely to cry because the process is rapid and abrasion-free. Patients also comment that the saline electrolyte used with routine EEG Nets does not smell or damage their hair.

Quick Application Time
Geodesic Sensor Nets use abrasion-free application methods and the Net structure allows all electrodes to be applied at once. Application times for the routine monitoring HydroCel Geodesic Sensor Net range between 5 minutes for 32 channels to 15 minutes for 256 channels. EEG staff rapidly learn the application technique.

Pediatric EEG Sensor NetSuperior Patient Safety
Because no abrasion is required with Geodesic Sensor Nets, the skin on the scalp is not compromised, which reduces the risk of infection. Often, it is argued that mild abrasion during the course of skin preparation does not compromise the integrity of the skin. However, studies have shown that this is not an accurate assumption. For further information, see Bild, S. (1997). Detection of occult blood on EEG surface electrodes. American Journal of Electroneurodiagnostic Technology, 38, 251-257.

No Sedation
Sedating children to obtain EEG is often done in clinical settings. This is not required when you use Geodesic Sensor Nets; rapid application time and the comfortable fit make sedation unnecessary.

All Patient Populations
Suitable for all patient ages and hair types (with the exception of corn rows and dreadlocks), Geodesic Nets have been used successfully with difficult-to-record populations, such as children with autism, elderly patients with dementia, and people with ADHD.

Complete Head Coverage
Complete head coverage ensures that all clinically relevant info is captured. Guaranteeing complete head coverage requires attention to both appropriate intersensor distance and coverage of the underside of the head. 256-channel EEG sensor Net

The first aspect of complete head coverage refers to the intersensor distance (that is, how far apart one sensor is from another sensor). Smaller intersensor distances translate to a more accurate measurement of the voltage field.

The second aspect refers to coverage of the underside of the head (for example, below the ears, including the face). It is common to believe that electrodes on the inferior surface of the head do not pick up EEG. However, voltage fields generated by the brain are volume conducted throughout the entire head. Moreover, certain brain regions, such as the inferior temporal lobes and ventral aspects of the frontal lobe, are oriented such that the voltage fields generated by these brain regions are best detected by electrodes on the inferior surface of the head.

The consequence of incomplete head coverage is that clinically significant EEG signals can be missed by sparse electrode placement and by lack of electrode placement on the underside of the head. For detailed information, see:

Luu, P., Tucker, D. M., Englander, R., Lockfeld, A., Lutsep, H., & Oken, B. (2001). Localizing acute stroke-related EEG changes: Assessing the effects of spatial undersampling. Journal of Clinical Neurophysiology, 18, 302-317.

Sperli, F., Spinelli, L., Seeck, M., Kurian, M., Michel, C. M., & Lantz, G. (2006). EEG source imaging in pediatric epilepsy surgery: A new perspective in presurgical workup. Epilepsia, 47, 1-10.

Srinivasan, R., Tucker, D. M., & Murias, M. (1998). Estimating the spatial Nyquest of the human EEG. Behavior Research Methods, Instruments, & Computers, 30, 8-19.

Contact us for more information

Geodesic Sensor Nets are compatible with EGI's Geodesic EEG systems only. Contact us for more information on purchasing Geodesic EEG systems or purchasing nets for your current Geodesic EEG system.

The sale of medical devices is strictly regulated by national laws. Please contact MagstimEGI Neuro for further details. Not all products are available in all markets. This page is not an offer to sell a medical device in any country where its sale would be prohibited by law.