Elodie Roullot

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A fully automated segmentation method of the left ventricle from short-axis cardiac MR images is proposed and evaluated. The segmentation is based on morphological filtering and gradient vector flow snake for which an automatic setting of parameters has already been proposed. The present work focuses on the automatic detection of a region of interest (ROI)(More)
Vincent Villette,1,2 Frédérique Poindessous-Jazat,1,2 Axelle Simon,1,2 Clément Léna,3 Elodie Roullot,4 Brice Bellessort,1,2 Jacques Epelbaum,1,2 Patrick Dutar,1,2 and Aline Stéphan1,2 1Inserm Centre de Psychiatrie et Neurosciences, Unité Mixte de Recherche (UMR) 894, 75014 Paris, France, 2Université Paris Descartes, Faculté de Médecine, 75005 Paris, France,(More)
The memory deficits associated with Alzheimer's disease result to a great extent from hippocampal network dysfunction. The coordination of this network relies on theta (symbol) oscillations generated in the medial septum. Here, we investigated in rats the impact of hippocampal amyloid beta (Abeta) injections on the physiological and cognitive functions that(More)
A statistical methodology is proposed to rank several estimation methods of a relevant clinical parameter when no gold standard is available. Based on a regression without truth method, the proposed approach was applied to rank eight methods without using any a priori information regarding the reliability of each method and its degree of automation. It was(More)
In this paper we address the problem of reconstructing a high resolution volumic image from several low resolution data sets. A solution to this problem is proposed in the particular framework of magnetic resonance angiography (MRA), where the resolution is limited by a trade-o5 between the spatial resolution and the acquisition time, both being(More)
This work aimed at combining different segmentation approaches to produce a robust and accurate segmentation result. Three to five segmentation results of the left ventricle were combined using the STAPLE algorithm and the reliability of the resulting segmentation was evaluated in comparison with the result of each individual segmentation method. This(More)
More than 2 people out of 10 suffer from allergies, which can take various forms, from eczema to anaphylactic reactions with possible lethal consequences. Diagnosis is achieved through so-called prick-tests or IDR (intradermo-reaction): the injection of a small quantity of substances suspected to cause the allergic manifestation induces an erythema, the(More)
In Alzheimer's disease, amyloid beta peptide (Aβ) accumulation is associated with hippocampal network dysfunction. Intrahippocampal injections of Aβ induce aberrant inhibitory septohippocampal (SH) network activity in vivo and impairment of memory processing. In the present study, we observed, after hippocampal Aβ treatment, a selective loss of neurons(More)
A method for reconstructing magnetic resonance angiography (MRA) volumes from successive acquisitions is described. The method is based on double oblique acquisitions of highly anisotropic MRA volumes, each of which corresponds to reduced k-space filling. These partial k-spaces are then combined to obtain a 3D k-space adapted to the frequency spread of the(More)
  • E. Roullot
  • 2008 15th International Conference on Systems…
  • 2008
In the field of color image calibration, several image transformation models are used, among which the linear model, the affine model, or the quadratic model; we show that the linear algebraic model is the most natural model under the usual assumptions on the image formation and we provide the detailed mathematical justification. Then we examine the(More)