Mechanical Resonance Characterization by Gradient System Transfer Function

Motivation: While gradient system transfer functions (GSTF) is an effective method for system characterization and compensation of hardware imperfection, the interpretation of the frequency peaks of GSTF as mechanical resonance lacks solid proof. Goal(s): Our goal was to provide conclusive evidence to verify the relationship between the frequency peaks of GSTF and mechanical resonance. Approach: We measured the GSTF and mechanical resonance on the same MRI system and compared the resonance frequency points. Results: The results indicate a good correspondence between the frequency peaks of GSTF and mechanical resonance. Impact: Our study offers solid evidence for explaining the frequency peaks of GSTF, which is beneficial for avoiding the resonance frequency points by frequency lockout methods when setting scanning parameters.