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.
Any clinical whole-body MR imager can be adapted for experimental small animal imaging. The design of an rf receiver coil and an efficient magnified imaging technique are presented. Application of this small animal imaging technique is illustrated using a study of paramagnetic contrast enhancement of a tumor in the mouse.
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