Global EMC solutions provider EMIS announced the availability of the MF420-2CF-M MRI Filter, a specialised electrical filter for use in magnetic resonance imaging (MRI) 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 10 GHz, 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:
- Power line filters – Main AC supply (single/three-phase), Gradient amplifiers, RF amplifiers
- 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.
EMIS aims to offer an end-to-end solution to meet industry’s ongoing EMI challenges. With a robust global supply footprint across eight industry segments, EMIS is continuously investing in technology and skills to deliver its promise of efficiency with seamless customer support.