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Fig. 1C. —In vitro artifact behavior of three biliary endoprostheses. One asterisk = Smart Stent (Cordis, Miami, FL), two asterisks = polyethylene stent (Cook, Moenchengladbach, Germany), three asterisks = Easy Wallstent (Schneider, Buelach, Switzerland). Rapid acquisition with relaxation enhancement image (2800/1000; in-plane resolution, 1 mm; slice thickness, 50 mm; scan orientation, parallel to long stent axis). Lumen of cobalt alloy—based Easy Wallstent is completely overlain with artifact formation. Relative interior lumen of the nitinol-based Smart Stent is visualized at about 50%, and relative interior lumen of polyethylene stent stands at 100%.

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