Braided Device Foreshortening Computation of braided stent length change

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

Congreso; Computer Assisted Radiology and Surgery; 2015

Purpose An important issue of deployment of braided stents, such as flow diverters, is the change in total length (foreshortening) underwent by the device when is released in the blood vessel from the catheter. The distal end is controlled by the interventionist, but knowing the proximal end of the device is not trivial. In this work we assess and validate a novel method for the computation of the final length of a braided stent inside anatomically accurate silicon vessel models. Methods Accurate silicon vessel models have been gen- erated from the 3D mesh surface models to deploy a braided device and validate the accuracy of the method. Computation of the length of a braided stent when it is deployed is based on the morphological characterization of the blood vessel along with the study of the change of length of small segments of the braided device. Results The method has been applied to three 3D mesh surfaces from a Three-Dimensional Rotational Angiog- raphy image of real patients. Length estimation varies in the order of 15-30% with respect to the stent speci- fication. Conclusion The method calculates in a few seconds the final length of a braided stent inside a vessel, showing an accurate matching of the maximum length change estimated on the cases studied. This technique could provide useful information for improved endovascular treatment of intracraneal aneurysms in the future.