The authors introduce the two following papers. A general review of MR
I evolution during the ten past years is proposed. Some recent evoluti
ons are emphasized : fast imaging, MR angiography, workstations devote
d to 3D reformations and functionnal imaging are illustrated. The comp
lementary position of CT and MR, and the worldwide machines diffusion
are summarized. The authors of following papers are introduced and pre
sented.