EMIS Introduces MRI Filter for High-Field Systems and Imaging Applications with Suppression up to 10GHz

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EMIS, an EMC solutions provider, has announced the availability of the MF420-2CF-M MRI Filter, 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 different from general electronics filtering as MRI environments are sensitive to RF noise and require shielded-room integrity as well as attenuation across wide frequency bands.

EMI filters are used 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. Cables entering the MRI room can act as antennas and leak noise into the shielded enclosure.

MRI EMC filters provide suppression of unwanted signals over a wide frequency range up to 10GHz, preventing external noise from affecting MRI signals and ensuring 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 designed to meet the performance requirements of equipment manufacturers and ensure compatibility with high-field MRI systems and imaging processes. The filter components are enclosed in a shielded and sealed metallic housing that protects against dust, moisture, and corrosion.

Key features include:

• Connection via threaded conduit and flexible wire leads, allowing installation in shielded MRI rooms.
• Designed with an internal discharge bleeder resistor that 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 minimizing unintended current flow.

EMIS offers solutions to meet EMI requirements. With a global supply footprint across eight industry segments, EMIS invests in technology and skills.

EMI Solutions has been designing and manufacturing EMI filters for more than 40 years and is a source for EMI and EMC solutions across industries, applications and the frequency spectrum. Products available include EMI/EMC Components, Feedthrough Components, Power Quality, Military Grade Filters and Surge Protection. Customers are supported by a consulting team, a Pre-Compliance Lab and a safety certified standard product offering of over 2500 part-numbers produced in their facility.

Click here to learn more about the MF420-2CF-M MRI filter.