In a low-field portable MRI system, e.g. a permanent-magnet-based system, $$$B_0$$$ is less homogeneous thus $$$T_2^*$$$ is short. However, the ring-down of the transmit RF energy is slow, which dramatically decreases the strength of acquired signals or limits the minimum echo time for a CPMG type experiment. In this abstract, we present the design of a no-tuning inductive-coupling Q-damping circuit for transmit-coils in a low-field MRI/NMR system. The proposed circuit can effectively and quickly damp RF energy yet simple to be implemented and constructed. The effectiveness is successfully demonstrated in simulations and experimentally. In the experiment, it shows that the ring-down time is reduced by about 45%.
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