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A growing number of cases of rupture at an infundibulum, progression of infundibulum to a frank aneurysm, and subarachnoid hemorrhage (SAH) in the posterior communicating artery (PCoA) have been reported. Using patient-specific geometric models of the supraclinoid internal carotid artery (ICA) with PCoA infundibulum or aneurysm, high-resolution(More)
Advances in computational methods and medical imaging techniques have enabled accurate simulations of subject-specific blood flows at the level of individual blood cell and in complex arterial networks. While in the past, we were limited to simulations with one arterial bifurcation, the current state-of-the-art is simulations of arterial networks consisting(More)
SUMMARY We analyze the correlation focusing objective functional introduced by van Leeuwen and Mulder to avoid the cycle-skipping problem in full waveform inversion. While some encouraging numerical experiments were reported in the transmission setting , we explain why the method cannot be expected to work for general reflection data. We characterize the(More)
Least-squares acoustic waveform inversion often suffers from a very narrow basin of attraction near the global minimum. In order to mitigate this problem, this paper introduces an iterative inversion scheme where the notion of proximity of two traces is not the usual least-squares distance, but instead involves registration as in image processing. Observed(More)
The MIT Faculty has made this article openly available. Please share how this access benefits you. Your story matters. This paper presents an original method that can be used for identifying time-varying nonlinear damping characteristics of a nonlinear oscillation system. The method developed involves the nonparametric identification, in which only the(More)
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