Dr. Murielle Torregrossa Profile

Dr. Murielle Torregrossa

at Univ de Strasbourg

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Publications (9)

Proceedings Article | 5 March 2021 Presentation

Multimodal imaging platform for image-guided surgery: application to blood perfusion assessment

Silvère Ségaud, Enagnon Aguénounon, Joseph Angelo, Sara Gravelyn, Henrique Waxin, Lucile Zorn, Julien Lamy, Murielle Torregrossa, Michele Diana, Sylvain Lecler, Sylvain Gioux

Proceedings Volume 11634, 116340J (2021) https://doi.org/10.1117/12.2578461

KEYWORDS: Blood, Multimodal imaging, Luminescence, Tissues, Image-guided intervention, Imaging systems, Optical properties, Near infrared, Visualization, Tissue optics

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SPIE Journal Paper | 13 March 2019 Open Access

Real-time, wide-field, and quantitative oxygenation imaging using spatiotemporal modulation of light

Manon Schmidt, Enagnon Aguénounon, Amir Nahas, Murielle Torregrossa, Bruce Tromberg, Wilfried Uhring, Sylvain Gioux

JBO, Vol. 24, Issue 07, 071610, (March 2019) https://doi.org/10.1117/12.10.1117/1.JBO.24.7.071610

KEYWORDS: Modulation, Optical properties, Cameras, Image processing, Absorption, Diffuse optical imaging, Scattering, Light scattering, Blood, Tissues

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Proceedings Article | 24 May 2018 Presentation

Real-time oxygenation imaging using spatio-temporal modulation of light (Conference Presentation)

Manon Schmidt, Amir Nahas, Swapnesh Panigrahi, Murielle Torregrossa, Sylvain Gioux

Proceedings Volume 10685, 1068516 (2018) https://doi.org/10.1117/12.2306469

KEYWORDS: Modulation, Optical properties, Real time imaging, Surgery, Tissues, Tissue optics, Diffuse optical imaging, Absorption, Scattering, Image processing

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Most surgeries are currently performed subjectively, with outcomes that are largely dependent on the experience of the surgeon. Providing objective information about tissue that need to be resected or avoided could reduce the variability in surgical outcomes. Spatial Frequency Domain Imaging (SFDI) is a novel diffuse optical imaging method that has the potential to identify tissue viability over a large field of view. In this method, a spatial sinusoidal pattern is projected onto the tissue to get the optical properties of the tissue at each pixel. More recently, Single Snapshot of Optical Properties (SSOP) hase been developed to provide such image feedback in real-time within the specific constraints of surgery. However, while SSOP has been shown to provide information about tissues at a single wavelength in real-time, during surgical applications, it is critical to obtain spectrally-resolved functional information that can be easily interpreted by the surgeons. Optical properties at multiple wavelengths are therefore needed to correlate the absorption and scattering coefficients with the tissue functional and structural information. In this work, we propose a novel method relying on spatio-temporal modulation of light to obtain multispectral optical properties in real time. A temporal-encoding method is used to distinguish different wavelengths by modulating each wavelength at a one particular chosen frequency. The temporally-modulated light is then used to project sinusoidal patterns onto the tissues for SSOP processing. The scene is then recorded with a fast camera to get multiple information in 3 dimensions: two spatial dimensions for SSOP and the third temporal dimension for wavelength. Discrete Fourier Transform (DFT) is used to separate the modulation frequencies pixels by pixels, and each 2D image obtained for every wavelength is processed using SSOP to obtain absorption and scattering coefficients. Finally, the optical properties at each wavelength are used to provide functional and structural information about tissues. We validated this proof of concept using 2 wavelengths (665 and 860nm) during phantom measurements and in vivo by obtaining real-time oxygenation videos. This work lays the foundation for the clinical translation of real-time quantitative multispectral imaging.

Proceedings Article | 17 February 2011 Paper

3D modeling of noncontact fiber-based approach for time-resolved diffuse optical tomography

F. Nouizi, M. Torregrossa, O. Geneveaux, R. Chabrier, P. Poulet

Proceedings Volume 7896, 78961Z (2011) https://doi.org/10.1117/12.874670

KEYWORDS: Photons, Scattering, 3D modeling, Diffuse optical tomography, Sensors, Absorption, Diffusion, Finite element methods, Optical fibers, Chemical elements

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Proceedings Article | 10 July 2009 Paper

3D modeling for solving forward model of no-contact fluorescence diffuse optical tomography method

F. Nouizi, R. Chabrier, M. Torregrossa, P. Poulet

Proceedings Volume 7369, 73690C (2009) https://doi.org/10.1117/12.831677

KEYWORDS: Photons, Luminescence, 3D modeling, Optical fibers, Sensors, Diffuse optical tomography, Scattering, Data modeling, Finite element methods, Diffusion

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Proceedings Article | 14 October 2003 Paper

Effects of prior MRI information on image reconstruction in diffuse optical tomography

Murielle Torregrossa, C. Virginie Zint, Patrick Poulet

Proceedings Volume 5143, (2003) https://doi.org/10.1117/12.500103

KEYWORDS: Magnetic resonance imaging, Scattering, Absorption, Image segmentation, Diffusion, Reconstruction algorithms, Finite element methods, Diffuse optical tomography, Tissues, Image restoration

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Proceedings Article | 29 July 2003 Paper

Use of MRI information to initialize the first stage of the image reconstruction algorithm in diffuse optical tomography

Murielle Torregrossa, Chantal-Virginie Zint, Patrick Poulet

Proceedings Volume 4955, (2003) https://doi.org/10.1117/12.476861

KEYWORDS: Magnetic resonance imaging, Scattering, Absorption, Reconstruction algorithms, Diffusion, Finite element methods, Diffuse optical tomography, Image restoration, Tissues, Light scattering

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Proceedings Article | 29 July 2003 Paper

Comparison of two time-resolved detectors for diffuse optical tomography: photomultiplier tube--time-correlated single photon counting and multichannel streak camera

Patrick Poulet, Chantal Zint, Murielle Torregrossa, Wilfried Uhring, Bernard Cunin

Proceedings Volume 4955, (2003) https://doi.org/10.1117/12.476841

KEYWORDS: Streak cameras, Picosecond phenomena, Optical fibers, Sensors, Photons, Waveguides, Diodes, Scattering, Semiconductor lasers, Diffuse optical tomography

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Proceedings Article | 29 June 2001 Paper

Near-infrared optical tomography of scattering cylindrical phantoms using time-resolved detection

Chantal-Virginie Zint, Feng Gao, Murielle Torregrossa, Patrick Poulet

Proceedings Volume 4250, (2001) https://doi.org/10.1117/12.434476

KEYWORDS: Scattering, Photons, Absorption, Optical tomography, Tissues, Light scattering, Reconstruction algorithms, Optical properties, Streak cameras, Image restoration

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Showing 5 of 9 publications

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