Optimizing RF Coil Design to Minimize RF Interference in MR-Guided Microwave Liver Ablations at 1.5T

Abstract

Motivation: Clinical MRI-guided microwave ablations often suffer from noise due to electromagnetic interference (EMI) between ablation probes and imaging coils. Instead of modifying the clinical microwave ablation system that could compromise FDA-approval, we explore alternative coil designs to mitigate the noise. Goal(s): Minimize EMI between the microwave ablation probes and imaging coils during clinical MR-guided microwave ablations. Approach: We applied a band-pass filter, studying the impact of coil size, and investigating efficient coil combinations to reduce interference. Results: A band-pass filter led to a 89% improvement in field uniformity. Also employing smaller coils can mitigate the ripple effects induced by the ablation probe. Impact: Our study addresses the critical need to reduce electromagnetic interference (EMI) between microwave ablation probes and imaging coils during clinical MR-guided microwave ablations at 1.5T. Motivated by the interference challenges in current clinical setups, we develop methods to mitigate EMI.