Photograph (left) and SSFP MR image (right) depict the location of the four metal devices used for in vitro imaging. The Palmaz genesis bare metal stent (Cordis, Bridgewater, NJ) is in the upper left corner, the stainless steel coil (Cook Medical, Bloomington, IN) is in the upper right corner, the Amplatzer vascular plug (St. Jude Medical, St. Paul, MN) (vasc plug) is in the lower left corner and the Amplatzer atrial septal occluder (St. Jude Medical, St. Paul, MN) (ASO) is in the lower right corner