In a previous article, we explored the Philips MR400 Patient Monitoring System and its role in supporting patient monitoring within the MRI environment. One of the key components of the full MR400 configuration is the ECG Module 3.0, a specialised wireless ECG monitoring device designed specifically for use during MRI procedures.
Like all proprietary accessories developed for the MR400 platform, the ECG Module 3.0 is MRI-compatible and designed to operate safely within the unique conditions of the MRI environment. This compatibility is essential, as conventional patient monitoring equipment may pose safety risks when exposed to the powerful magnetic fields generated by an MRI scanner.
Wireless Monitoring Within the MRI Environment
The ECG Module 3.0 communicates wirelessly with the MR400 monitor using a 2.4 GHz RF communication link. Once powered on, the module automatically establishes communication with the MR400, allowing patient ECG data to be transmitted without the need for long wired connections between the monitor and the patient.
Powered by two rechargeable batteries, the ECG Module can operate independently from the monitoring cart and can be positioned alongside the patient during MRI examinations. The module maintains communication with the monitoring system at distances of up to approximately 9.1 metres, providing flexibility for different MRI room layouts and workflows.
One of the major advantages of this wireless design is that the module can accompany the patient into the MRI bore during a scan. However, correct placement remains important. To minimise the risk of imaging artefacts affecting diagnostic quality, the module should be positioned away from the anatomical area being scanned whenever practical.
For example:
- During head or neck imaging, position the module closer to the patient’s feet.
- During lower extremity imaging, position the module closer to the patient’s upper body.
These simple placement considerations help maintain image quality while ensuring continuous patient monitoring throughout the examination.
Module Controls and Indicators
The ECG Module 3.0 has been designed with a straightforward user interface that allows clinicians to quickly verify device status before and during a procedure.
Information displayed on the module includes:
- Battery status
- Communication channel information
- Active channel selection
- Channel selection controls
These indicators help operators confirm that the module is functioning correctly and communicating with the appropriate MR400 monitor.
Multi-Channel Operation
The ECG Module 3.0 supports operation across five communication channels. This capability allows multiple MR400 monitoring systems to operate within the same MRI department without interfering with one another.
Each ECG Module can be assigned to a dedicated channel, enabling multiple patients to be monitored simultaneously in adjacent MRI environments. Individual MR400 monitors can receive data from their assigned ECG Module, creating a flexible monitoring solution for departments operating multiple MRI systems.
Changing the Communication Channel
- Press and hold the Channel Selection button until the channel indicator begins flashing.
- Press the Channel Selection button repeatedly until the desired channel appears.
- Hold down the Channel Change button until the Channel Change button becomes solid.
Connection status can be verified by ensuring that the communication channel number and colour indicators match on both the ECG Module and the MR400 monitor.
Storage and Workflow Considerations
To support efficient workflow and equipment organisation, the MR400 monitoring cart includes integrated storage pockets on the rear of the unit specifically designed for the ECG Module 3.0 when not in use.
Benefits include:
- Reduced risk of accidental damage
- Improved equipment availability
- Fewer misplaced accessories
- Faster room preparation between patients
While simple in design, proper accessory management contributes significantly to equipment readiness and clinical efficiency.
ECG Lead Cable Options
Although the ECG Module 3.0 performs the monitoring and wireless communication functions, it relies on dedicated MRI-compatible ECG lead sets to obtain physiological data from the patient.
Philips provides three primary ECG lead cable configurations:
- CV
- Adult
- Neonatal
While all three perform the same monitoring function, they differ primarily in lead length and configuration, enabling clinicians to select the most suitable option for the patient and clinical application.
Each cable type incorporates specialised MRI-compatible design features intended to improve safety and usability within the MRI environment.
Anti-Coil Cable Design
One of the most important safety features incorporated into the ECG lead assemblies is the anti-coil sleeve design.
MRI systems generate powerful electromagnetic fields during scanning. Any cable introduced into the MRI environment has the potential to form loops or coils if not managed correctly. Under certain conditions, these loops can contribute to unwanted heating effects.
To reduce this risk, the ECG lead assemblies utilise an anti-coil design that encourages cables to maintain a natural, uncoiled configuration during use.
Benefits of Anti-Coil Technology
- Reduced risk of cable looping
- Lower potential for cable heating
- Improved cable management
- Enhanced patient safety during MRI examinations
This design feature forms part of the broader safety strategy employed throughout MRI-compatible monitoring systems.
Philips ECG Quadrode and Multiple Patch Electrodes
The Adult and Neonatal cable systems utilise Philips Quadrode ECG electrodes, a proprietary electrode solution developed specifically for use with the ECG Module 3.0.
Unlike traditional ECG monitoring systems that require multiple individual electrodes to be positioned separately, the Quadrode design simplifies patient preparation while promoting consistent electrode placement.
Benefits of the Quadrode System
- Faster patient setup
- Simplified electrode placement
- Improved consistency between examinations
- Optimised compatibility with the ECG Module 3.0
The electrode assembly is designed to be positioned on the left side of the patient’s chest to obtain reliable ECG monitoring throughout the MRI procedure.
CV Cable Configuration
While the standard Adult and Neonatal solutions use the Quadrode electrode system, the CV Cable is designed for situations where Quadrode positioning is not suitable and uses the Multiple Patch Electrodes instead.
Examples include:
- Larger patient body habitus
- Clinical restrictions on electrode placement
- Situations where standard positioning is impractical
- Pacemaker Patient Scans
In these circumstances, the CV Cable functions more like a traditional ECG lead set, allowing individual electrodes to be positioned manually on the patient. The placement of the single electrodes must still remain around the left side of the patient to ensure an accurate ECG Trace.
This provides greater flexibility while maintaining compatibility with both the ECG Module 3.0 and the MR400 Patient Monitoring System.
ECG Electrode Placement
Correct electrode placement is essential for obtaining a reliable ECG signal during MRI examinations. Philips provides recommended placement configurations based on patient type to help optimise ECG signal quality while maintaining MRI compatibility and patient safety.
Adult Male Electrode Placement
For adult male patients, the Philips Quadrode electrode assembly should be positioned according to the recommended placement guide shown below.
Refer to the image below for Adult Male electrode placement.
Adult Female Electrode Placement
For adult female patients, the Philips Quadrode electrode assembly should be positioned according to the recommended placement guide shown below. Care should be taken to ensure appropriate electrode contact while maintaining patient comfort and dignity.
Refer to the image below for Adult Female electrode placement.
Paediatric Electrode Placement
For paediatric patients, electrode positioning may differ from adult placement due to patient size and anatomy. Follow the recommended placement configuration shown below.
Refer to the image below for Paediatric electrode placement.
Neonatal Electrode Placement
For neonatal patients, the dedicated neonatal cable and electrode arrangement should be used. Correct placement is particularly important to ensure reliable ECG monitoring while accommodating the patient’s small size.
Refer to the image below for Neonatal electrode placement.
Electrode Placement Best Practices
Regardless of patient type:
- Ensure the skin is clean and dry before applying electrodes.
- Ensure that all Electrodes or Quadrode are placed on the left side of the patient
- Confirm all electrode connections are secure.
- Route lead cables to minimise looping and excess cable length.
- Verify ECG waveform quality on the MR400 monitor before commencing the MRI examination.
- Follow all MRI safety procedures and local clinical protocols.
Proper electrode placement and cable management help maximise monitoring performance while supporting patient safety throughout the MRI procedure.
Conclusion
The Philips MR400 ECG Module 3.0 is a critical component of the MR400 Patient Monitoring System, providing continuous ECG monitoring throughout MRI examinations while maintaining compatibility with the challenging MRI environment.
Through wireless communication, dedicated MRI-compatible lead systems, anti-coil cable technology, and specialised electrode designs, the module enables reliable patient monitoring without compromising image quality or patient safety.
Understanding how the ECG Module 3.0 operates, and how its accessories are designed to address the unique challenges of MRI monitoring, helps clinical users maximise both monitoring performance and diagnostic outcomes.
Frequently Asked Questions
1. Can the Philips MR400 ECG Module 3.0 be used inside the MRI bore?
Yes. The ECG Module 3.0 is specifically designed for MRI applications and can accompany the patient into the MRI bore during scanning. To help minimise image artefacts, the module should be positioned as far away from the anatomy being examined as practical.
For example, during head imaging, the module is typically positioned closer to the patient’s feet.
2. Can the Philips MR400 ECG Module 3.0 be used to monitor patients with a pacemaker?
Yes. Philips has conducted an investigation conducted by MRI Safety that can be provided on request that concluded that the ECG Module 3.0 can be used to safely monitor patients with implantable devices. Ensure that the CV Lead is used in conjunction with the Multiple Patch Electrodes to avoid interference with the pacemaker. However, as with any ECG monitoring system, clinicians should always follow their facility’s policies and the patient’s specific clinical requirements when monitoring pacemakers patients.
The MR400 provides continuous ECG monitoring throughout the MRI examination, allowing clinicians to observe cardiac activity while maintaining MRI compatibility and patient safety.
3. Why does the ECG Module 3.0 support multiple communication channels?
The ECG Module 3.0 operates on five separate communication channels, allowing multiple MR400 systems to be used within the same MRI department without signal interference.
Matching the channel number on both the ECG Module and the MR400 ensures that patient data is transmitted to the correct monitor.
4. What is the purpose of the anti-coil design used in the ECG lead cables?
The anti-coil design helps prevent ECG lead cables from forming loops within the MRI environment.
Reducing cable looping helps:
- Minimise the potential for cable heating
- Improve cable management
- Enhance patient safety during MRI examinations
This design is an important feature of the MR400 ECG monitoring system and its MRI-compatible accessories.