MR-velocity mapping in vascular stents to assess peak systolic velocity. In vitro comparison of various stent designs made of Stainless Steel and Nitinol
✍ Scribed by VANHOLTEN, J; KUNZ, P; MULDER, P; PATTYNAMA, P; LAMB, H; VANDIJK, L
- Publisher
- Springer
- Year
- 2002
- Tongue
- English
- Weight
- 165 KB
- Volume
- 15
- Category
- Article
- ISSN
- 0968-5243
No coin nor oath required. For personal study only.
✦ Synopsis
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 (paired t -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 B/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.