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The impact of recirculation on the quantification of perfusion is often neglected. It can however introduce a bias or some variability in the estimation of perfusion parameters and thus hamper comparison between exams.Time-intensity curves (TICs) were simulated using a one-compartment model fed by an arterial input function (AIF). A simple model was developed to simulate recirculation in the AIF....
Dynamic X-ray computed tomography with contrast agent injection allows quantifying the tumor response to an antiangiogenic treatment. For hepatic tumors, it is crucial to correct for respiratory movements to ensure a good quantification of perfusion parameters.Two registration models were tested on eight dynamic exams: 1) rigid model and 2) elastic model based on Free Form Deformation. Each exam included...
Automated extraction of quantitative parameters from cardiac magnetic resonance images is crucial for the management of patients with myocardial infarct. This paper proposes a postprocessing procedure to jointly analyze Cine and delayed-enhanced (DE) acquisitions, in order to provide an automatic quantification of myocardial contraction and enhancement parameters and a study of their relationship...
Cette étude propose d’évaluer la robustesse d’une méthode régularisée de correction de l’atténuation des microbulles en imagerie de contraste ultrasonore (ICU) in vivo. L’approche régularisée repose sur l’hypothèse d’une proportionnalité entre les coefficients d’atténuation et de rétrodiffusion et sur une condition limite dans une région de référence reflétant l’atténuation cumulée (AC) des microbulles...
Magnetic resonance imaging (MRI) offers the potential to estimate blood pressure gradients, by solving the Navier-Stokes model relating the haemodynamic pressure to the acceleration and velocity. Here we compared results directly obtained using acceleration encoded MR sequences with those calculated from MR velocity acquisitions available on clinical systems. We found that using velocity encoded data...
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