1986 Actively‐shielded superconducting scanners 1991 fMRI invented – (15 yrs after first clinical images) 1993 Philips: Compact, actively shielded, no LN shield scanners 1994 Diffusion Tensor Imaging invented 1997 GE introduces ZBO scanners: no LHe refill over lifetime 2000 Commercial 3 T MRI from GE, Siemens and Philips 2001 GE, Philips:高场开放MRI系统2005年西门子:广泛的圆柱扫描仪(70厘米患者孔)
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