R-Net MR: Sponge-based electrode system for simultaneous EEG-fMRI
The addition of the R-Net MR to our MRI product portfolio provides the flexibility to choose the right electrode system for your research needs. The R-Net MR consists of saltwater sponges and passive Ag/AgCl electrodes housed in a durable and flexible silicone structure. The MR version of the R-Net also has current-limiting resistors for safe recordings in the MRI environment and a gel-based ECG electrode. The R-Net MR is available for BrainAmp MR amplifiers and can be used in scanners up to 3 T. Its use is subject to our general 3 T EEG-fMRI safety guidelines.
Highest safety standards
All electrodes in the R-Net MR are fitted with serial current-limiting resistors.
Resistors are also placed inside the cap connector, acting like an additional RF-filter.
ECG electrodes contain higher resistors than EEG electrodes and the lead wire is made of carbon to compensate for the technical characteristics of longer wires.
The drop-down ECG electrode lead wire is sheathed in plastic to avoid direct contact with the skin of the participant.
All electrode lead wires are routed on the outside of the net and secured to avoid loops and cable movement.
Wire length from electrode to the amplifier input is fixed to the minimal required length.
Cable tree exit point options are available to fit with different MRI head coils.
Clear MR labelling and safety guidelines are in line with industry standards.
Ease of use
Ultra-fast measurement preparation with our potassium chloride electrolyte solution
Highly convenient – no gel residues
The only sponge-based electrode system available that follows the international 10-10 positioning system
Serial number sticker on connector box for easy tracking and layout questions
The R-Net MR can be equipped with Carbon Wire Loops (CWL) for better correction of motion related artefacts. The CWLs are bipolar channels and the measurement requires a BrainAmp ExG MR. Further information can be found in this article as well as on our webinar channel.
KRIOS by Northern Digital Instruments NDI is an infrared camera system including software to digitize individual, real-life electrode positions. In order to work with KRIOS systems the electrodes will be equipped with permanent reflectors in a high quality and precise manner.
Passive electrode with Ag/AgCl pellet and sponge soaked with electrolyte
EEG electrode height [mm]
Approx. 16 mm
ECG electrode type
Multitrodes for MR with sintered Ag/AgCl sensors
ECG electrode height [mm]
Cable tree length [cm]
(including connector box)
Current limiting resistors [kOhm]
EEG channels: 10 (5 in electrode and 5 in connection box)
ECG channel: 20 (15 in electrode and 5 in connection box)
REF: 15 (10 in electrode and 5 in connection box)
GND: 15 (10 in electrode and 5 in connection box)
MR safety label
Sizes (head circumference)
Adult S (55): to fit head circumference 54-56
Adult M (57): to fit head circumference 56-58
Adult L (59): to fit head circumference 58-60
Adult XL (61): to fit head circumference 60-62
Child/Adolescent S (49): to fit head circumference 48-50
Child/Adolescent M (51): to fit head circumference 50-52
Child/Adolescent L (53): to fit head circumference 52-54
Number of channels
32, 64, 96, 128
Cable tree exit point
CPz (standard) or
FFCz (to fit Siemens 64 channel head coil)
Carbon Wire Loops
4 bipolar loops at left-frontal, right-frontal, left-parietal, and right parietal locations
Permanent reflectors fitted to each electrode for compatibility with KRIOS by Northern Digital Instruments
Suitable for use in MR scanner room
Yes, up to 3 T.
MR conditional, i.e. guidelines must be observed
Brain Products GmbH confirms the compliance of this product according to Directive 2011/65/EU of the European Parliament and the Council of 8 June 2011 on the restriction of the use of certain hazardous substances in electrical and electronic equipment (recast published in the Official Journal of the European Union on 1 July 2011) as well as all its amendments up to and including the Commission delegated directive (EU) 2015/863 of 31 March 2015 (published in the Official Journal of the European Union on 4 June 2015).
Safe recordings with BrainCap MR, R-Net MR, and BrainAmp MR amplifiers (MR, MR plus, ExG MR) require close adherence to our safety instructions.