This work describes the design, construction, and testing of a 1.5 T cryogen-free LTS NbTi whole-body magnet with a bore diameter of 850 mm that is suitable for clinical MRI applications. The magnet was actively shielded and passively shimmed to achieve the confinement within a 0.5 mT stray magnetic field at 2.5/4 m radial/axial positions and 12.1 ppm field inhomogeneity over the 45 mm DSV. The magnet was conductively refrigerated using a two-stage GM cryocooler and can be maintained at a steady temperature of below 5.7 K during MRI scanning. The MRI scanner assembled with the designed cryogen-free magnet demonstrated stable performance and provided MRI images with good quality and high contrast.
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