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Thin film high temperature superconducting RF coils for low field MRI

We have built and tested a thin‐film high temperature superconducting (HTS) surface coil for MRI at 0.064T. When placed as close as possible to a conductive sample, the 6.7‐cm outer diameter HTS coil had a measured signal‐to‐noise ratio (SNR) 1.8; times higher than a room temperature copper coil of similar size and location. Our results predict that in some cases, SNR gains of about a factor of 2 can be attained in low‐field MRI systems by substituting HTS surface coils for copper coils.