We report on the performance and development of a 300-MHz (7 T) cryogenic receive- only surface coil for MRI of rat brain. Practical performance limits of the cryo-coil were tested such as SNR gains at 55 K for a 19 mm in diameter Cu coil and its frequency stability over long (up to a few days) scans. 3D-RARE isotropic images of ex-vivo rat brain up to 512 slices with outstanding isotropic resolution of 34 μm were acquired showing structural details not seen with conventional small animals coils. In addition, a comparison of such images with matching histological plates is discussed.
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