EEG:DSI 10/20

The Dry Sensor Interface (DSI) 10/20 is the first wireless headset designed to position 21 dry EEG sensors according to the 10/20 International System.
The features that make the DSI 10/20 a paradigm-shifting device include:

• Dry-Sensors:
Sensors require no gels or fluids, and do not leave messy residue

Rapid Donning


• No-prep:
High impedance electronics allow high fidelity EEG signals without skin abrasion or preparation
• Through-Hair:
Flat-ended finger electrodes contact scalp through-hair
• 10/20 Locations:
Headset automatically positions 21 sensors according to the 10/20 International System
• Rapid Set-up:
Easy-to-use headset is typically self-donned in less than 5 minutes
• Rapid Removal:
Easy-to-use headset is instantly taken off, and does not necessitate washing head afterwards

Excellent Signal Quality

DSI 10/20 signal quality has been validated as comparable to that obtained with wet electrode systems

• Alpha rhythm recorded simultaneously juxtaposed wet electrodes and dry sensors referred respectively to wet and dry references on right ear shows excellent signal correspondance (figure above)
• Independent testing of the technology by the Air Force Research Laboratory showed wet/dry signal correlations above 80%
Estepp, J.R., Monnin, J.W., Christensen, J.C. Wilson, G.F. Evaluaton of a Dry Electrode System for Electroencephalography: Applicatons for Psycholophysiological Cognitve Workload Assessment. Human Factors and Ergonomics Society Annual Meetng Proceedings, 2010

Ambulatory


• Low Noise:
Patented shielding and circuit design reduce environmental noise
• Motion Artifact Resistant:
Proprietary artifact reduction technologies reduce motion artifacts and enable ambulatory use in office or laboratory environments.
• Wireless:
Integrated amplifiers, digitizers, and transmitters allow data to be transmitted in wired or wireless modes or stored in on micro-SD cards
• Low-Power:
Low-power electronics extend the battery life, and enable 24 hours of recording

Long-Term Comfort

• Comfortable:
Mechanical design carefully controls contact pressure allowing comfortable wear all day



• Comfort survey results for subjects wearing QUASAR’s EEG headset or helmet for up to 8 hours indicated that subjects do not mind the headset.
• Y-axis is the average of a subjectve scale where 1 was considered “unnoticeable” and 5 “comfortable but noticeable”, and 10 “untolerable”. (#) is the number of subjects in each time bin.

Research Quality System


• Safe:
The DSI 10/20 is a research prototype designed to meet ANSI safety standards, and has been designated a non-significant risk device for use in human research by several IRBs
• Reusable:
The system can be cleaned by users, and sensor tips are reusable and replaceable
• Expandable:
DSI 10/20 can synchronously record EMG signals from QUASAR’s dry EMG sensors, and it operates seamlessly with QUASAR’s Physiological Status Monitor (PSM) belt.
• 10/20 Locations:
DSI 10/20 positions its sensors according to the International 10/20 System, with 21 sensors located at: Fp1, Fp2, Fz, F3, F4, F7, F8, Cz, C3, C4, Pz, P3, P4, T3, T4, T5, T6, O1, O2, Mastoid L (M1), and Mastoid R (M2). The Ground is at Fpz.

DSI 10/20 Specifications




Sensors	up to 23 at 10/20 International System locations
Headsize fit	55-60cm circumference
Headset weight	500g
Run-time:	24hrs continuous
Internal data storage:	70hrs
Wireless range:	10m
Number of digitized inputs:	12 selectable differential channels
Analog/Digital Converter:	16 bits
Analog/Digital resolution:	0.317 uV referred to input
Sample Rate:	240 or 960 Hz
Bandwidth:	0.02-120Hz
Gain:	60
Common mode rejection ratio:	> 120dB
Channel Cross-talk:	< -70dB with sensors
Input Impedance (1Hz):	47Gohm
Input bias current:	<25pA
DC offset tolerance:	+/-200mV
Maximum input range:	10mV pk-pk
Noise (1-50Hz):	<3 uV pk-pk

These prototype systems are available for sale and lease.
Download an electronic brochure (PDF 3MB), and please contact us for pricing.