Medical Imaging
	Département TSI		CNRS UMR 5141 LTCI

Cardio-vascular imaging:

• Restoration of high resolution images from low resolution acquisitions for blood vessel analysis in Magnetic Resonance Angiography
• Modeling the heart and its deformations
• Segmentation of blood vessels in 3D angiography

Brain imaging:

• Segmentation of anatomical structures
• Segmentation of the skull
• Segmentation and modeling of the internal ear
• Segmentation and recognition of cortical sulci
• Precise segmentation of the cortex
• Modeling of the cortex evolution
• Segmentation and recognition of internal structures from an anatomical atlas
• Integrating spatial relations into deformable models
• Measures of symmetry
• Registration of anatomical and functional images
• Detection of activations in functional imaging
• Meshes of head structures
• Study of the effects of electromagnetic waves on head tissues
• Extraction of white matter fiber bundles from diffusion MRI
• Detection of pathologies

• Acquisition and visualization of 3D echographic data

Thorax imaging:

• Processing and visualization of the bronchic tree (complex 3D structures)
• Non linear elastic matching in oncology

Regularized reconstruction of 3D MRA images of high resolution from images of anisotropic resolution
PhD thesis of Elodie Roullot (in collaboration with Alain Herment and Elie Mousseaux, INSERM)
 
 
 

	Two corresponding slides fron the anisotropic acquisitions.
Reconstruction without constraints		Reconstruction with smoothness constraints, but without contour preservation		Reconstruction with smoothness and contour preservation constraints

3D MRI acquisition	Modeling using superquadrics	Volume of the left ventricle during the cardiac cycle

Segmentation of the brain, the brainstem and the cerebellum

   Segmentation of the skin, the muscles, the skull, the brain, the cerebellum, the brainstem
 
 
 

Contrainsts with respect to already recognized structures	Approximate location provided by the atlas	Information provided by the grey levels of the image	Relative position with respect to recognized structures	Relative position with respect to recognized structures (3D view)

Superimposition of the atlas and the image before recognition of the caudate nucleus	Approximate location provided by the atlas	Fusion of informations	Segmentation and recognition of the caudate nucleus

Of few structures of the atlas	Structures recognized in the 3D image

Multi-scale analysis of functional images (TP and fMRI) and graph matching	Superimposition of activation areas during a primary motor task (right hand) on the subject anatomy	Localization of an activation due to a vibration in the hand with respect to two cortical sulci

3D MRI Image	Segmentation of the skin, the skull, the brain

High resolution mesh	Surface of a tetraedral mesh	Smoothed mesh

Acquisition of a head range image, triangular mesh after filtering constituting a head model.

Morphological measurements on the ear.

Average ear included in a generic phantom.
 

Voxel representation used for numerical simulations of field propagation, superimposition of voxel components on the mesh.

Maximum SAR (``specific absorption rate'') in a cube of 10 gramms.

3D reconstruction of a foetus	3D reconstruction of carotid and thyroid

Non linear matching in oncology
PhD theses of Oscar Camara and Gaspar Delso, with a contribution by Olivier Colliot (in collaboration with Jean-François Stévenet and Sylvie Hammer, Segami, Hervé Foehrenbach, Val-de-Grâce Hospital, Xavier Marchandise and Jean-Yves Rousseau, CHRU Lille, Jean-Pierre Rigo, Monaco hospital)