BrainCap MR
General notes
- Max./Min. channel counts depend on amplifier system and cap size.
- Different cap types (SubInion vs. Subtemporal), cap cuts (A-cut vs. C-cut) and cap fabrics (high comfort vs. high precision) are available.
BrainCap MR: Superior electrode system for simultaneous EEG-fMRI
The simultaneous recording of EEG-fMRI data is a well-established technique and our MRI product portfolio is the gold standard for this application. We strive to keep our products up to date to guarantee the highest safety and comfort for the participant as well as outstanding data quality. As such, our BrainCap MR Rev. 3 (from April 2020) has evolved in recent years to keep up with the demands of this dynamic research area.
The BrainCap 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.
Maximum safety standards
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- Electrodes are fitted with current-limiting resistors
- Resistors in the cap connector act like an additional RF-filter
- Electrode cables are routed and secured to avoid loops and cable movement
- Drop-down electrodes (e.g., ECG) are sheathed to avoid direct contact with the skin
- Small gaps are inserted into the electrode rings to avoid induction in closed loops
- ECG electrodes contain higher resistors than EEG electrodes to compensate for the technical characteristics of longer wires
- 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
- MR labelling and safety guidelines according to industry standards
Comfort
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- Flat electrodes allow for high comfort when the head is resting inside the MR scanner
- Empty electrode holders are added to caps with fewer than 64 channels to compensate for gaps between the electrodes and more evenly distribute pressure when the head is resting on the electrodes inside the MR scanner
- A new cap cut has been adopted that encompasses more of the head, cheeks and neck. As a result, these caps fit better on more head shapes, and they rarely slip backwards from frontopolar sites
Ease of use
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- Serial number sticker for easy tracking, assembly and layout questions
- Colored and labeled electrodes for quick location identification (e.g., 10-20, 10-10)
Data quality
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- Carbon Wire Loops (CWL) for state-of-the-art correction of motion-related artifacts
What happens to old electrode caps that do not meet the current safety standards?
If you have an older BrainCap MR (before April 2020) there is no urgent need to change your cap. You can continue to use your caps in your current setup as long as you continue to adhere to the safety guidelines. The only difference in the safety guidelines for older caps compared to the new ones is that the sequence limitations are stricter for old caps. This is due to the longer cable tree on older caps (see our MR sequence guidelines). It is worth considering replacing your old BrainCap MR with the latest version if you would like to benefit from the new safety standards and the increased flexibility regarding the MRI sequence limitations.
BrainCap MR Sleep
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- Electrode cap with layout according to the AASM guideline standards
- Exit point of cable tree fronto-central or centro-parietal depending on used headcoil
- Clean and tight cable routing
- Compatible amplifier families: BrainAmp MR
- Available channel counts: 15, 32 and 64 (including ECG, EOG, EMG depending on specific model)
- Size range: 34 – 64 cm head circumference (limited size range may apply to higher channel counts)
Carbon Wire Loops
The BrainCap MR Rev. 3 can be equipped with Carbon Wire Loops (CWL) – see image on the right) for state-of-the-art 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 newsletter article as well as on our webinar channel. The addition of CWLs to BrainCap MR is limited to adult head sizes.
| BrainCap MR | Technical specifications |
|---|---|
| Features | |
| Standard cap | Sub-Inion fabric with integrated chin belt, white |
| Fabric | Sizes 52 – 64: High precision fabric Sizes 50 and smaller: High comfort fabric |
| Current limiting resistors | EEG channels: 10 kΩ (5 in electrode and 5 in connection box) ECG channel: 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) |
| Electrode type | Multitrodes for MR with sintered Ag/AgCl sensors |
| Electrode height | 3.8 mm |
| Cable tree length (including connector box) | 31 cm |
| MR safety label | MR conditional |
| Compulsory choices | |
| Sizes (head circumference) | Adult caps: 54, 56, 58, 60, 62, 64 Children caps: 50 (3-4 years), 52 (5-10 years), 54 (11-14 years) Infant caps: 36 (newborn), 38, 40 (3 months), 42, 44 (7 month), 46, 48 (2 years) |
| Number of channels | 32 (for all sizes) 64 (for size 42 and larger) 96, 128 (for size 52 and larger) |
| Cuts | A-Cut or C-Cut |
| Cable tree exit point | CPz (standard) or FFCz (to fit Siemens 64 channel head coil) |
| Additional options | |
| 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 |
| Medical device | No |
| CE marking | The Brain Products GmbH confirms the RoHS 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 0fficial Journal of the European Union on 4 June 2015). The CE marking is based on the RoHS compliance. |
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Worldwide Caution: Our products are scientific equipment for INVESTIGATIONAL USE ONLY! Medical use e.g. for diagnosis, treatment of disease or other such purposes is strictly forbidden.