Research Article| Volume 88, P1-8, August 2021

Artifact quantification of venous stents in the MRI environment: Differences between braided and laser-cut designs


      • MRI in novel venous stents is not impaired by susceptibility-induced artifacts.
      • RF-induces artifacts are more complex in braided compared to laser-cut stents.
      • Braided stents can enhance the intraluminal signal due to B1 amplification.



      To quantify B0- and B1-induced imaging artifacts of braided venous stents and to compare the artifacts to a set of laser-cut stents used in venous interventions.


      Three prototypes of braided venous stents with different geometries were tested in vitro. B0 field distortion maps were measured via the frequency shift Δ f using multi-echo imaging. B1 distortions were quantified using the double angle method. The relative amplitudes B 1 rel were calculated to compare the intraluminal alteration of B1. Measurements were repeated with the stents in three different orientations: parallel, diagonal and orthogonal to B0.


      At 1.5 T, the braided stents induced a maximum frequency shift of Δ f x < 100 H z . Signal voids were limited to a distance of 2 mm to the stent walls at an echo time of 3 ms. No substantial difference in the B0 field distortions was seen between laser-cut and braided venous stents. B 1 rel maps showed strongly varying distortion patterns in the braided stents with the mean intraluminal B 1 rel ranging from 63 ± 18 % in prototype 1 to 98 ± 38 % in prototype 2. Compared to laser-cut stents the braided stents showed a 5 to 9 times higher coefficient of variation of the intraluminal B 1 rel .


      Braided venous stent prototypes allow for MR imaging of the intraluminal area without substantial signal voids due to B0-induced artifacts. Whereas B1 is attenuated homogeneously in laser-cut stents, the B1 distortion in braided stents is more inhomogeneous and shows areas with enhanced amplitude. This could potentially be used in braided stent designs for intraluminal signal amplification.


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