How to Test MRI RF Coils

+ Vector Network Analyzer

Testing and characterizing RF coils through simulation

Optimizing RF coil performance requires thorough design simulation and multichannel testing to ensure high-quality MRI images and patient safety. Three key parameters in designing high-performance RF coils are field efficiency, impedance mismatch, and interchannel coupling. Design engineers use simulation software to check the efficiency of the coils for a stronger signal-to-noise ratio (SNR) and maximum power transfer from the MRI system to the coils. The design simulation also assists in minimizing reflections and cross talk.

A vector network analyzer can determine the S-parameter measurements, and engineers can use the reflection loss parameters results to determine the coils' impedance matching. Additionally, the insertion loss parameters results indicate the coupling between different channels of RF coils. It is recommended that engineers use a multiport vector network analyzer for these two tests to accommodate the multichannel coils.

MRI RF coil characterization solution

MRI RF coil fabrication requires testing for impedance matching, radiation, and interchannel coupling. The Keysight MRI RF coil characterization test solution consists of the Keysight vector network analyzer and the PathWave EM design software. The Keysight network analyzer commonly offers two, four, or six ports, enabling easy scalability to support up to 32 channels. Its multiport version significantly simplifies the testing process. The EM design software simulates and models the environment of the RF coils by analyzing the 3D electromagnetic effects of the RF coils and other high-speed RF or microwave components.

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