A 0.6-tesla superconducting magnet for magnetic resonance imaging

The authors introduce the first superconducting magnet system for whole body magnetic resonance imaging built in China. The character and composition of the system are described in detail. The warm bore diameter of the magnet system is 1.08 m; the length is 2.55 m; and the total weight is 7000 kg. The main 0.6-T magnet is composed of six superconducting coils. The coils are wound with NbTi wire with a 1-mm diameter, and the rated current is 142.6 A. Passive shims are used to correct the central field and achieve a uniformity of 2.5 ppm in 30 cm DSV. The cryostat system is equipped with an LHe and LN/sub 2/ closed-loop refrigerator.<
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