Mapping of the body lumen may be accomplished using a variety of techniques, including ultrasound, e.g. B-mode ultrasound examination, intravascular ultrasound (???IVUS???), angiography, radiography, magnetic resonance imaging (???MRI???), computed tomography (???CT???), and CT angiography. [0074] As an alternative to custom-forming the curvature of stent 40 or the curvature of secondary apparatus