The active resonance imaging stent (AMRIS): initial experimental in vivo results with locally amplified MR angiography and flow measurements. - Kivelitz,D.; Wagner,S.; Hansel,J.; Schnorr,J.; Wetzler,R.; Busch,M.; Melzer,A.; Taupitz,M.; Hamm,B. (Invest Radiol, 2001)