WEB shape modification: morphological and positional 3D quantification of the device

MUÑOZ ROMINA; JANOT KEVIN; DAZEO NICOLÁS; NARATA ANA PAULA; ROUCHAUD AYMERIC; LARRABIDE IGNACIO

Val d?Isère

Conferencia; ABC WIN; 2023

Motivation During follow-up of patients treated with WEB, changes in the device shape has been observed. The quantitative measurement of the WEB shape modification would offer useful information to be studied in association with the anatomical results. We present a quantification of WEB morphology and 3D position of the device.Materials and method We used 3DRA images of aneurysms patients treated with WEBs. Each case had a 3DRA post-treatment image, its mask, and a 3DRA follow-up image. The WEB was segmented from the mask and the follow-up images, obtaining the WEB surface immediately after treatment and the WEB surface at the follow-up. Volume, surface area, height and maximum diameter of both surfaces were calculated and compared to analyze the morphological changes. To evaluate the position changes the angle between the WEB axis and the segment between the arterial bifurcation and a point upstream was calculated for the post-treatment and the follow-up, and then compared. The distance between the bifurcation and the center of mass of each surface was also calculated and compared.Results We used this methodology to quantify the changes between post-treatment and follow-up of six WEBs used in treatments of aneurysms. We observed changes in WEB volume with a mean difference of -13.31mm (30,70). The mean difference in height change was -0.88mm (0,73), while the change in maximum diameter resulted in a mean difference of 0.44mm (0,36). Concerning the positional analysis, the mean difference of the calculated angle was 8.37° (8.13) and the mean difference in the distance between the bifurcation and the WEB center of mass was 0.19mm (0.59).Conclusions This methodology allows quantifying the morphological and position changes suffered by the WEB device after treatment, offering new information to be studied in relation to the occurrence of WEB shape modification.