Ontology type: schema:Chapter Open Access: True
2014
AUTHORSDominik Neumann , Tommaso Mansi , Bogdan Georgescu , Ali Kamen , Elham Kayvanpour , Ali Amr , Farbod Sedaghat-Hamedani , Jan Haas , Hugo Katus , Benjamin Meder , Joachim Hornegger , Dorin Comaniciu
ABSTRACTClinical applications of computational cardiac models require precise personalization, i.e. fitting model parameters to capture patient’s physiology. However, due to parameter non-identifiability, limited data, uncertainty in the clinical measurements, and modeling assumptions, various combinations of parameter values may exist that yield the same quality of fit. Hence, there is a need for quantifying the uncertainty in estimated parameters and to ascertain the uniqueness of the found solution. This paper presents a stochastic method to estimate the parameters of an image-based electromechanical model of the heart and their uncertainty due to noise in measurements. First, Bayesian inference is applied to fully estimate the posterior probability density function (PDF) of the model. To that end, Markov Chain Monte Carlo sampling is used, which is made computationally tractable by employing a fast surrogate model based on Polynomial Chaos Expansion, instead of the true forward model. Then, we use the mean-shift algorithm to automatically find the modes of the PDF and select the most likely one while being robust to noise. The approach is used to estimate global active stress and passive stiffness from invasive pressure and image-based volume quantification. Experiments on eight patients showed that not only our approach yielded goodness of fits equivalent to a well-established deterministic method, but we could also demonstrate the non-uniqueness of the problem and report uncertainty estimates, crucial information for subsequent clinical assessments of the personalized models. More... »
PAGES9-16
Medical Image Computing and Computer-Assisted Intervention – MICCAI 2014
ISBN
978-3-319-10469-0
978-3-319-10470-6
http://scigraph.springernature.com/pub.10.1007/978-3-319-10470-6_2
DOIhttp://dx.doi.org/10.1007/978-3-319-10470-6_2
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PUBMEDhttps://www.ncbi.nlm.nih.gov/pubmed/25485357
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