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Abstract #0901

Breaking the EDITER Channel Barrier: Frequency Division Multiplexing for Affordable, Multi-Coil EMI Mitigation

Sai Abitha Srinivas1, Helina K Wilson1, Jason P Stockmann2,3, Monika Śliwiak 2,3, Clarissa Z Cooley2,3, and William A Grissom1
1Department of Biomedical Engineering, Case Western Reserve University, Cleveland, OH, United States, 2A.A. Martinos center for Biomedical Imaging, Charlestown, MA, United States, 3Department of Radiology, Massachusetts General Hospital, Boston, MA, United States

Synopsis

Keywords: Low-Field MRI, Low-Field MRI, EMI mitigation, Artifacts, RF

Motivation: The performance of EMI mitigation techniques improves with more receiver channels, but this requires costly multi-channel consoles, limiting the accessibility and increasing the cost of low-field MRI.

Goal(s): To develop the ability to record multiple EMI detector coil signals with a single console receiver channel.

Approach: A low-cost solution was designed that uses frequency division multiplexing (FDM) to combine signals from three RF coils into one channel.

Results: Using two EMI detector coils and the EDITER algorithm at 72 mT, the FDM approach achieved equivalent EMI reduction (95.55%) to a conventional three-channel EDITER setup (94.26%), with a single receiver channel.

Impact: We demonstrate a single-channel EMI mitigation method using Frequency Division Multiplexing. This enables more cost-effective EMI mitigation by reducing the need for multiple receiver channels on the console.

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