raided Device Foreshortening: Computation of braided stent length change

H. FERNANDEZ; J. M. MACHO; J. BLASCO; W. MAILAENDER; L. SERRA; I. LARRABIDE

Barcelona

Congreso; Computer Assisted Radiology and Surgery (CARS); 2015

Purpose An important issue of deploymentof braided stents, such as flow diverters, is the change intotal length (foreshortening) underwent by the devicewhen is released in the blood vessel from the catheter.The distal end is controlled by the interventionist, butknowing the proximal end of the device is not trivial.In this work we assess and validate a novel method forthe computation of the final length of a braided stentinside anatomically accurate silicon vessel models.Methods Accurate silicon vessel models have been gen-erated from the 3D mesh surface models to deploy abraided device and validate the accuracy of the method.Computation of the length of a braided stent when it isdeployed is based on the morphological characterizationof the blood vessel along with the study of the changeof length of small segments of the braided device.Results The method has been applied to three 3D meshsurfaces from a Three-Dimensional Rotational Angiog-raphy image of real patients. Length estimation variesin the order of 15-30% with respect to the stent speci-fication.Conclusion The method calculates in a few seconds thefinal length of a braided stent inside a vessel, showingan accurate matching of the maximum length changeestimated on the cases studied. This technique couldprovide useful information for improved endovasculartreatment of intracraneal aneurysms in the future.