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Publications associées (40)

Myocardial perfusion assessment by use of system identification method in a one-compartment model

Cardiovascular magnetic resonance has been shown to provide high data quality for myocardial perfusion assessment However, to analyze the perfusion data, some signal processing and modeling is needed to correct for motion related artifacts and limited spat ...

Ieee Service Center, 445 Hoes Lane, Po Box 1331, Piscataway, Nj 08855-1331 Usa2007

Myocardial Perfusion Assessment by Use of System Identification Method in a One-Compartment Model

Philippe Thévenaz, Michel Kocher

Cardiovascular magnetic resonance has been shown to provide high data quality for myocardial perfusion assessment. However, to analyze the perfusion data, some signal processing and modeling is needed to correct for motion related artifacts and limited spa ...

IEEE2007

The non-circular shape of FloWatch®-PAB prevents the need for pulmonary artery reconstruction after banding

Alfio Quarteroni, Paolo Zunino, Ludwig Von Segesser

To evaluate the differences between non-circular shape of FloWatch®-PAB and conventional pulmonary artery (PA) banding. Methods: Geometrical analysis. Conventional banding and FloWatch®-PAB perimeters were plotted against cross-sections. Computational flui ...

Elsevier Science B.V., Oxford2006

Paraffin-PDMS composite thermo microactuator with large vertical displacement capability

Nico de Rooij, Danick Briand, Herbert Shea

We have micromachined and tested the first paraffinPDMS composite thermal microactuator having multi shot large vertical displacement capabilities ( 160 um for 1 mm diameter device). A solid to liquid phase change of trapped paraffin into the PDMS is used ...

2006

Multidimensional, Multistage Wavelet Footprints: A New Tool for Image Segmentation and Feature Extraction in Medical Ultrasound

Michaël Unser, Michael Sühling, Muthuvel Arigovindan

We present a new wavelet-based strategy for autonomous feature extraction and segmentation of cardiac structures in dynamic ultrasound images. Image sequences subjected to a multidimensional (2D plus time) wavelet transform yield a large number of individu ...

SPIE2003

Arterial elastance and heart-arterial coupling in aortic regurgitation are determined by aortic leak severity

Nikolaos Stergiopoulos, Patrick Segers, Nico Westerhof

In aortic valve regurgitation (AR), aortic leak severity modulates left ventricle (LV) arterial system interaction. The aim of this study was to assess (1) how arterial elastance (E(a)), calculated as the ratio of LV end-systolic pressure and stroke volume ...

2002

Granular Segregation as a Critical Phenomenon

Pedro Miguel Nunes Pereira de Almeida Reis

We present the results of an experimental study of patterned segregation in a horizontally shaken shallow layer of a binary mixture of dry particles. An order parameter for the segregated domains is defined and the effect of the variation of the combined f ...

American Physical Society2002

Left ventricular wall stress normalization in chronic pressure-overloaded heart: a mathematical model study

Nikolaos Stergiopoulos, Patrick Segers, Nico Westerhof

It is generally accepted that the left ventricle (LV) hypertrophies (LVH) to normalize systolic wall stress (sigma(s)) in chronic pressure overload. However, LV filling pressure (P(v)) may be elevated as well, supporting the alternative hypothesis of end-d ...

2000

Mechanism of pulmonary venous pressure and flow waves

Nikolaos Stergiopoulos, Patrick Segers

The pulmonary venous systolic flow wave has been attributed both to left heart phenomena, such as left atrial relaxation and descent of the mitral annulus, and to propagation of the pulmonary artery pressure pulse through the pulmonary bed from the right v ...

2000

Theoretical study of dynamics of arterial wall remodeling in response to changes in blood pressure

Nikolaos Stergiopoulos, Alexander Rachev

The dynamics of arterial wall remodeling was studied on the basis of a phenomenological mathematical model. Sustained hypertension was simulated by a step increase in blood pressure. Remodeling rate equations were postulated for the evolution of the geomet ...

1996

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