1. A magnetic resonance imaging system comprising: scanning means for selectively exciting in turn a plurality of regions of an object acquiring echo data from the object while the object is continuously moved; and processing means for producing image data from the echo data acquired by the scanning means, wherein the scanning means includes position-moving means for moving the plurality of selectively excited regions according to a movement of the object such that the plurality of regions are selectively excited in sequence region by region within a predetermined imaging range.