Suppression of unwanted signals.

EMI Filter for high-field MRI systems and sensitive imaging processes.

The MF420-2CF-M MRI Filter, from EMIS, is a specialised electrical filter for use in Magnetic Resonance Imaging rooms to block unwanted electromagnetic interference (EMI) and radio-frequency interference (RFI) from entering or leaving the MRI environment.

Designing or selecting an EMI filter for high-field MRI systems is very different from general electronics filtering as MRI environments are extremely sensitive to RF noise and require shielded-room integrity as well ultra-high attenuation across wide frequency bands.

EMI filters are critical in MRI High-field systems which operate with very low-level RF signals in an environment featuring strong static magnetic fields. External EMI contamination can degrade signal-to-noise ratio, create artifacts in images and cause regulatory non-compliance. Even cables entering the MRI room can act as antennas and leak noise into the shielded enclosure.

MRI EMC filters provide strong suppression of unwanted signals over a wide frequency range up to 10GHz, preventing external noise from affecting MRI signals and ensuring high-quality diagnostic images. These filters are typically installed at the point where power lines or signal cables enter an MRI shielded room, for example:
1. Power line filters - Main AC supply (single/three-phase), Gradient amplifiers, RF amplifiers.
2. Signal line filters - Ethernet / data lines, patient monitoring systems, fire alarms, intercoms, sensors.

MRI filters are specially designed to meet the strict performance requirements of equipment manufacturers and ensure compatibility with high-field MRI systems and sensitive imaging processes. The filter components are enclosed in a shielded and sealed metallic housing that protects against dust, moisture, and corrosion ensuring long-lasting performance.

Key features include:

• Connection via threaded conduit and flexible wire leads, allowing fast and secure installation in shielded MRI rooms.
• Designed with an internal discharge bleeder resistor that safely discharges stored electrical energy when power is turned off, reducing the risk of electric shock during maintenance.
• Designed with low leakage current, ensuring patient safety by minimising unintended current flow.

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