R-Net MR
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. If your research requires ultra-fast application, minimal invasiveness and maximum comfort, the R-Net MR is the perfect match. 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
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- 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.
Fast preparation time
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- The R-Net MR can be prepared with our potassium chloride electrolyte solution, allowing for a significantly faster preparation in comparison to gel-based electrodes — with no gel residues.
- It is the only sponge-based electrode system available that follows the international 10-10 positioning system.
- Serial number sticker on connector box allows easy tracking and layout questions.
Easily integrated with your EEG-fMRI setup
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- The R-Net MR can be used in scanners up to 3T and can easily be added to your current EEG-fMRI setup without any additional safety considerations.
Data quality
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- Carbon Wire Loops (CWL) allow state-of-the-art correction of motion-related artifacts.
Carbon Wire Loops
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. The addition of CWLs to R-Net MR is limited to adult head sizes.
| Technical specifications | R-Net MR |
|---|---|
| Features | |
| Sizes (cm) | Adults: 55, 57, 59, 61 Children: 49, 51, 53 |
| Fabric | Silicone net |
| Electrodes | |
| Electrode type | EEG: passive sponge-based electrode with Ag/AgCl pellet Dropdown electrode: Multitrodes for MR with sintered Ag/AgCl sensors |
| Height | Approx. 16 mm |
| Diameter | Approx. 13 mm |
| Number of channels | 32, 64, 96, 128 (for sizes 49-61) |
| Current limiting resistors | EEG channels: 10 kΩ (5 in electrode and 5 in connection box) drop-down channels: 20 kΩ (15 in electrode and 5 in connection box) REF: 15 kΩ (10 in electrode and 5 in connection box) GND: 15 kΩ (10 in electrode and 5 in connection box) |
| Cable length | 31 cm (including connector box) |
| Cable tree exit point | CPz or FFCz |
| Carbon Wire Loops | 4 bipolar loops at left-frontal, right-frontal, left-parietal, and right parietal locations |
| Miscellaneous | |
| Suitable for use in MR scanner room | Yes, up to 3 T. MR conditional, i.e. guidelines must be observed |
| MR safety label | MR conditional |
| Medical device | No |
| CE marking | Brain Products GmbH confirms the RoHS compliance of this product according to the 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). |
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