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Abstract #4842

Theoretical and Experimental Assessment of Radiofrequency Shielding Artifacts of Laser-cut Venous Stents

Lisa Regler1, Simon Reiss1, Klaus Düring2, Wibke Uller3, and Michael Bock1
1Division of Medical Physics, Dept. of Diagnostic and Interventional Radiology, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, Freiburg, Germany, 2Alaxo, Wallgau, Germany, Wallgau, Germany, 3Dept. of Diagnostic and Interventional Radiology, Medical Physics, University Medical Center Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany, Freiburg, Germany

Synopsis

Keywords: Other Interventional, Artifacts

Motivation: An accurate diagnosis of vein patency is hindered in vein stents by RF shielding artifacts. Some dependencies of RF shielding on stent geometry have been described.

Goal(s): Determine a general model for RF shielding prediction in vein stents based on stent geometry.

Approach: Field simulations and measurements of the relative induced B1 were performed of stent building blocks (loops, rectangles) and compared to analytical calculations.

Results: Separating the RF field into its linearly polarized components, a relationship between RF shielding and loop radius and rectangle dimension could be found, and the shielding could be calculated after component combination.

Impact: This work provides a fundamental method to calculate RF-induced shielding from stent geometries. For laser-cut vein stents this information can be used to calculate the optimal excitation flip angle, or to modify the stent geometry to improve the in-stent luminosity.

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