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Comparative Study
. 2009 Nov;30(10):1993-7.
doi: 10.3174/ajnr.A1743. Epub 2009 Sep 12.

Carotid artery stents: in vitro comparison of different stent designs and sizes using CT angiography and contrast-enhanced MR angiography at 1.5T and 3T

M Lettau  1 , A Sauer, S Heiland, S Rohde, M Bendszus, S Hähnel
Affiliations
Comparative Study

Carotid artery stents: in vitro comparison of different stent designs and sizes using CT angiography and contrast-enhanced MR angiography at 1.5T and 3T

M Lettau et al. AJNR Am J Neuroradiol. 2009 Nov.

Abstract

Background and purpose: CT angiography (CTA) and MR angiography (MRA) are increasingly used methods for evaluation of stented vessel segments. Our aim was to compare CTA, contrast-enhanced MRA (CE-MRA) at 1.5T, and CE-MRA at 3T for the visualization of carotid artery stents and to define the best noninvasive imaging technique as an alternative to conventional angiography for each stent.

Materials and methods: CTA and CE-MRA appearances of 18 carotid artery stents of different designs and sizes (4.0 to 10.0 mm) were investigated in vitro. For each stent, artificial lumen narrowing (ALN) was calculated.

Results: With CE-MRA at 3T and at 1.5T, ALN in most nitinol stents was lower than that in the groups of stainless steel and cobalt alloy stents. In most nitinol stents and in both cobalt alloy stents, ALN was lower on CE-MRA at 3T than at 1.5T. In all stainless steel stents, ALN was lower on CTA than on CE-MRA. With CTA and CE-MRA, in most stents ALN decreased with increasing stent diameter.

Conclusions: CTA and CE-MRA evaluation of vessel patency after stent placement is possible but is considerably impaired by ALN. Investigators should be informed about the method of choice for every stent. Stent manufacturers should be aware of potential artifacts caused by their stents during noninvasive diagnostic methods such as CTA and CE-MRA.

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Figures

Fig 1.
Fig 1.
Imaging features of the stents. Stent acronyms are defined in Table 1. CTA indicates CT angiography; CEMRA, contrast-enhanced MR angiography.
Fig 2.
Fig 2.
Artificial lumen narrowing of the stents on CTA and CE-MRA at 1.5T and 3T
See this image and copyright information in PMC

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References

    1. Eckstein HH, Ringleb P, Allenberg JR, et al. Results of the Stent-Protected Angioplasty versus Carotid Endarterectomy (SPACE) study to treat symptomatic stenoses at 2 years: a multinational, prospective, randomised trial. Lancet Neurol 2008;7:893–902 - PubMed
    1. Bendszus M, Koltzenburg M, Burger R, et al. Silent embolism in diagnostic cerebral angiography and neurointerventional procedures: a prospective study. Lancet 1999;354:1594–97 - PubMed
    1. Hähnel S, Trossbach M, Braun C, et al. Small-vessel stents for intracranial angioplasty: in vitro comparison of different stent designs and sizes by using CT angiography. AJNR Am J Neuroradiol 2003;24:1512–16 - PMC - PubMed
    1. Lenhart M, Volk M, Manke C, et al. Stent appearance at contrast-enhanced MR angiography: in vitro examination with 14 stents. Radiology 2000;217:173–78 - PubMed
    1. Wall A, Kugel H, Bachman R, et al. 3.0 T vs. 1.5 T MR angiography: in vitro comparison of intravascular stent artifacts. J Magn Reson Imaging 2005;22:772–79 - PubMed

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