Abstract
Introduction: Peak systolic velocity (PSV) measurements of blood flow inside vascular stents allow reliable detection of in-stent restenosis. The purpose of this in vitro study was to evaluate the feasibility of obtaining PSV measurements inside vascular stents made of Stainless Steel and Nitinol, using a velocity encoded MR technique.Materials/methods: In a flow phantom, stents of Stainless Steel and Nitinol were studied. The phantom was integrated into a closed-tubing circuit driven by a MR dedicated pulsatile flow pump. MR imaging was performed on a 1.5 T system. The PSV in the tube without stent was used as the gold standard to determine the accuracy and the variability (pairedt-test and Pittman’s test) of the PSV measurements inside the stents.Results: PSV values inside the stents showed percentual difference in mean of −15 to 21% (P <0.05) at a pump setting of 10 and 20 ml/s.Conclusion: PSV measurements can be accurately obtained inside stents made of Stainless Steel and Nitinol. MR-velocity measurements may be used in patients to non-invasively evaluate stent patency and in-stent re-stenosis.
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van Holten, J., Kunz, P., Mulder, P.G.H. et al. MR-velocity mapping in vascular stents to assess peak systolic velocity. In vitro comparison of various stent designs made of Stainless Steel and Nitinol. MAGMA 15, 52–57 (2002). https://doi.org/10.1007/BF02693844
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DOI: https://doi.org/10.1007/BF02693844