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Dive into the research topics where Irene Buvat is active.

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Featured researches published by Irene Buvat.


The Journal of Nuclear Medicine | 2008

Impact of Image-Space Resolution Modeling for Studies with the High-Resolution Research Tomograph

Florent C. Sureau; Andrew J. Reader; Claude Comtat; Claire Leroy; Maria-Joao Ribeiro; Irene Buvat; Regine Trebossen

Brain PET in small structures is challenged by low resolution inducing bias in the activity measurements. Improved spatial resolution may be obtained by using dedicated tomographs and more comprehensive modeling of the acquisition system during reconstruction. In this study, we assess the impact of resolution modeling (RM) during reconstruction on image quality and on the estimates of biologic parameters in a clinical study performed on a high-resolution research tomograph. Methods: An accelerated list-mode ordinary Poisson ordered-subset expectation maximization (OP-OSEM) algorithm, including sinogram-based corrections and an experimental stationary model of resolution, has been designed. Experimental phantom studies are used to assess contrast and noise characteristics of the reconstructed images. The binding potential of a selective tracer of the dopamine transporter is also assessed in anatomic volumes of interest in a 5-patient study. Results: In the phantom experiment, a slower convergence and a higher contrast recovery are observed for RM-OP-OSEM than for OP-OSEM for the same level of statistical noise. RM-OP-OSEM yields contrast recovery levels that could not be reached without RM as well as better visual recovery of the smallest spheres and better delineation of the structures in the reconstructed images. Statistical noise has lower variance at the voxel level with RM than without at matched resolution. In a uniform activity region, RM induces higher positive and lower negative correlations with neighboring voxels, leading to lower spatial variance. Clinical images reconstructed with RM demonstrate better delineation of cortical and subcortical structures in both time-averaged and parametric images. The binding potential in the striatum is also increased, a result similar to the one observed in the phantom study. Conclusion: In high-resolution PET, RM during reconstruction improves quantitative accuracy by reducing the partial-volume effects.


Society of Nuclear Medicine Annual Meeting Abstracts | 2007

Experimental comparison of three methods for estimating tumor volume in FDG PET

Perrine Tylski; Nicolas Grotus; P. Giraud; Jean Claude Rosenwald; Irene Buvat


ORASIS - Journées francophones des jeunes chercheurs en vision par ordinateur | 2013

4-D Gradient Vector Flow : segmentation par surface active pour images multi-composantes

Vincent Jaouen; Paulo González; Simon Stute; Irene Buvat; Denis Guilloteau; Clovis Tauber


Society of Nuclear Medicine Annual Meeting Abstracts | 2010

Is partial volume correction useful for detecting tumor uptake changes in patient monitoring

Jacques Maisonobe; Simon Stute; Hatem Necib; Irene Buvat


Society of Nuclear Medicine Annual Meeting Abstracts | 2014

Effect of image reconstruction on FDG uptake quantification in atherosclerotic plaques of a rabbit model

S. Burg; Fabien Hyafil; Liliane Louedec; S. Leygnac; Pauline Huet; Dominique Le Guludec; Irene Buvat


Society of Nuclear Medicine Annual Meeting Abstracts | 2013

Highly realistic FDG PET simulations of patients with atherosclerotic plaques

Pauline Huet; S. Burg; Fabien Hyafil; Dominique Le Guludec; Irene Buvat


Society of Nuclear Medicine Annual Meeting Abstracts | 2012

Partial volume effect estimation and correction with 18FDG PET in aortic vascular wall

S. Burg; Alexandre Dupas; Simon Stute; Arnaud Dieudonné; Milan Milliner; Dominique Le Guludec; Irene Buvat


Society of Nuclear Medicine Annual Meeting Abstracts | 2012

Increased SNR of 3D+t Florbetapir-PET images using spatio-temporal diffusion

Clovis Tauber; Abhinay D. Joshi; Irene Buvat; Denis Guilloteau; Mark Mintun


Society of Nuclear Medicine Annual Meeting Abstracts | 2011

4D robust anisotropic diffusion for improved signal-to-noise ratio in dynamic PET imaging

Clovis Tauber; Simon Stute; Irene Buvat; M.J. Santiago-Ribeiro; Sylvie Chalon; Denis Guilloteau


Society of Nuclear Medicine Annual Meeting Abstracts | 2008

4D list-mode reconstruction for respiratory-gated PET acquisitions: A comparison to conventional techniques

Nicolas Grotus; Andrew J. Reader; Simon Stute; Jean-Claude Rosenwald; P. Giraud; Irene Buvat

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Simon Stute

University of Paris-Sud

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Clovis Tauber

François Rabelais University

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Denis Guilloteau

François Rabelais University

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P. Giraud

Paris Descartes University

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Nicolas Grotus

Centre national de la recherche scientifique

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