A Magnetic Resonance Imaging (MRI) system having a vacuum vessel
positioned about an imaging volume, one or more high temperature
superconducting coils positioned within the vacuum vessel, and a
cryocooler coupled to the vacuum vessel to operate the superconducting
coil at a temperature above 10 K. At least one gradient coil is
positioned between an imaging volume and the superconducting coil without
any thermal shielding interposed between the gradient coil and the
superconducting coil.