• 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

Benefits

Superior 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.

Superior 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.

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.

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.