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a) Compared to the benchmark SNR provided by the unshielded reference coil on isocenter (bar), the signal-to-noise ratio acquired by a shielded coil of our system remains stable, even when the coils sits in close proximity to one dissipating surface of the shield (12 mm coil offset to isocenter). b) Shimming is carried out on a volume encompassing both coils, and does not degrade SNR.
