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- A Herment, J P Guglielmi, P Dumee, P Peronneau, P Delouche
- Ultrasonics
- 1987

The definition of medical ultrasound images is strongly limited by the need for low examination frequencies which is imposed by the high attenuation of acoustic waves in tissues. The filtering effect of imaging systems is described and quantified for echography, transmission tomography and reflection tomography. Improvement of image definition is… (More)

- Bernard Fertil, Matthieu Massin, Sylvain Lespinats, Caroline Devic, Philippe Dumee, Alain Giron
- Nucleic Acids Research
- 2005

GENSTYLE (http://Genstyle.imed.jussieu.fr) is a workspace designed for the characterization and classification of nucleotide sequences. Based on the genomic signature paradigm, GENSTYLE focuses on oligonucleotide frequencies in DNA sequences. Users can select sequences of interest in the GENSTYLE companion database, where the whole set of GenBank sequences… (More)

- A L Bardou, P M Auger, S Achour, P Dumee, P J Birkui, M C Govaere
- Acta biotheoretica
- 1995

The present work is aimed at investigating the effects of myocardial infarction and ischemia on induction of ventricular fibrillation. Electrophysiologic effects of global and local ischemia (variation of the dispersion of refractory periods as well as conduction velocity) on initiation of reentry mechanisms was studied by means of computer simulations… (More)

- A Herment, G Demoment, P Dumee, J P Guglielmi, A Delouche
- IEEE transactions on ultrasonics, ferroelectrics…
- 1993

A class of adapted mean frequency estimators is proposed for color flow mapping. These estimators can be fitted to the specific characteristics of a given Doppler signal to optimize the compromise between the range of analysable frequencies and the variance of mean frequency estimation. A sub-optimal estimator is derived for real-time applications, and an… (More)

- A Herment, G Demoment, P Dumée
- IEEE transactions on bio-medical engineering
- 1996

An adaptive mean frequency estimator is proposed for color flow imaging. It is based on a series expansion of the first derivative of the autocorrelation function of the Doppler signal at origin. Its bias can be reduced by shifting the integration bounds in the series expansion and its variance adjusted by adapting the coefficients of the serial… (More)

- B Diebold, A Delouche, P Delouche, J P Guglielmi, P Dumee, A Herment
- Circulation
- 1996

BACKGROUND
Color Doppler and magnetic resonance imaging give pictures of abnormal jets within which the respective contribution of fluid mechanics and image artifacts are difficult to establish because of current technical limitations of these modalities. We conducted the present study to provide numerical descriptions of the velocity fields within… (More)

- M Piechocki, A Herment, A Delouche, P Dumée, P Peronneau
- Medical & biological engineering & computing
- 1991

A simple method for the improvement of the definition of the instantaneous spectrum estimate of Doppler signal is proposed. A short review of the stochastical properties of FFT spectrum estimates is presented. This review allowed us to develop a concept of the 'estimation noise' as an interpretation of the stochastic uncertainty of the estimation. This, in… (More)

- A Herment, E Mousseaux, +4 authors J Bittoun
- Journal of magnetic resonance imaging : JMRI
- 1999

A technique dedicated to spatial regularization of magnetic resonance (MR) velocity data has been implemented to improve flow image quality. It is assumed that neighboring flow-velocity pixels are partially correlated, although large-velocity discontinuities remain possible. Increasing MR signal magnitude due to the in-flow effect also is used to enhance… (More)

- A Herment, J P Guglielmi, P Péronneau, P Dumée
- Ultrasonic imaging
- 1989

Principles of high-resolution, ultrasonic imaging using data acquisition by a compound scanning with a sector echograph are presented. The signal processing is based on both deconvolution and reflection mode tomography. Three of the methods that can be derived from these principles are selected due to their lower computation costs. Applications of these… (More)

- B Diebold, A Delouche, P Dumée, J P Guglielmi, P Delouche, P Péronneau
- Journal of biomechanics
- 1990

In order to provide physical information supporting the clinical use of flow mapping, an in vitro model was designed to measure the velocity fields in a pulsatile hydraulic turbulent jet. We used a peak velocity ranging from 2.5 to 5.5 m.s-1, an orifice diameter ranging from 5.8 to 11.3 mm and confined the jet in a receiving tube whose diameter ranged from… (More)