Session

Friday, June 23, 2017 - 09:00 to 10:30
Prognosis of abdominal aortic aneurysms: A machine learning-enabled approach merging clinical, morphometric, biomechanical and texture information
Abstract: 
An effective surveillance strategy for the progression of abdominal aortic aneurysms (AAAs) may be achieved by assessing its expected growth rate in a personalized manner. Given the variety of factors with an impact on AAA growth, an integrative approach to the problem could potentially benefit from incorporating clinical and morphometric data, as well as mechanical stress characterizations. In addition, here we investigated the use of texture information on computed tomography angiography images within the AAA sac. A cohort of n=38 patients underwent a baseline examination, plus a follow-up visit to measure AAA growth, in terms of its maximum diameter (Dmax). Subsequently, each case was labelled as ‘slow’, ‘medium’ or ‘quick’ growth, compared to the expected rate reported in demographic studies, as a function of gender and baseline Dmax. We computed a total of 102 features (5 clinical, 17 morphometric, 4 biomechanical, and 76 on texture) and used a number of machine learning (ML) algorithms; with the aim of minimizing misclassification costs. The performance of the system was evaluated with a leave-one-out cross-validation scheme. The results achieved by the best performing approach, an ensemble of decision trees (‘LPBoost’) using the entire 102-dimensional feature space, indicated that the combination of different information sources, along with ML algorithms, may have a positive impact on the AAA prognosis assessment.
Fernando Garcia-Garcia's picture
Fernando Garcia-Garcia
ARTORG Center & University of Bern (CH)
Eleni Metaxa's picture
Eleni Metaxa
Stergios Christodoulidis's picture
Stergios Christodoulidis
Marios Anthimopoulos's picture
Marios Anthimopoulos
Nikolaos Kontopodis's picture
Nikolaos Kontopodis
Martina Correa-Londono's picture
Martina Correa-Londono
Thomas R. Wyss's picture
Thomas R. Wyss
Yannis Papaharilaou's picture
Yannis Papaharilaou
Christos V. Ioannou's picture
Christos V. Ioannou
Hendrik von Tengg-Kobligk's picture
Hendrik von Tengg-Kobligk
Stavroula Mougiakakou's picture
Stavroula Mougiakakou