This work describes methods and systems to implement Bloch-Siegert(BS) spatial encoding using simultaneous transmit and receive in low-field MRI. The key challenge is to reduce coupling power in receiver chains so that the on-resonance signal can be acquired during the off-resonance irradiation. The developments include combining filters and coil decoupling methods. Together these methods suppress irradiation leakage more than 60dB which, for an anticipated offset B1 field of 60 dBm, allows for spatial encoding in low-field MRI device.
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