All experiments were performed on an Agilent/Varian (Santa Clara, CA) DirectDrive 4.7-T small-animal MR scanner built around an Oxford Instruments (Abingdon, UK) horizontal superconducting magnet, with a gradient/shim coil assembly having a 12-cm inner-bore diameter and providing 60 G/cm with 200-μs rise time. All MR images, including phantoms, were acquired using the same laboratory-built actively decoupled transmit (volume, 7.5-cm inner diameter) and receive (surface, 2.5-cm inner diameter) coil pair (8).
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