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Fig. 1B. —MR angiograms and radiographic images of four balloon-expandable stents and three self-expandable stents. MR angiography was performed with flip angle of 30°; MR angiography images are maximum-intensity-projection images rendered from original data. MR angiograms (left) and radiographs (right) show balloon-expanded Vistaflex stent, which is composed of platinum, compared with three self-expandable stents made from nitinol or tantalum. Stents shown are Symphony (Boston Scientifc), Vistaflex (Angiodynamics), Strecker (Boston Scientifc), and Memotherm (Bard Angiomed) from top to bottom, respectively.