Commissariat &#xc0; L'&#xc9;nergie Atomique Et Aux &#xc9;nergies Alternatives

Commissariat a L'energie Atomique

Renaud Maroy

Bertrand Tavitian

Regine Trebossen

Paolo Zanotti Fregonara

Segolene De Gavriloff

Vincent Frouin

Régine Trebossen

It relates to a method for segmenting images, to a method for detecting specific structures, and to a related computer device. The method for segmenting a three-dimensional image of a subject includes dividing the image into a plurality of regions, and then hierarchically merging the regions resulting from the division in order to obtain a three-dimensional image partitioned into regions of interest. The hierarchical merging includes a merging step using shape and size criteria of the regions so as to avoid merging small regions. The method for detecting specific structures in an image, for example tumors, includes a step of segmenting an image into regions of interest. The method further includes calculating, for each region of interest, a plurality of criteria, including a shape criterion, of the regions of interest in order to discriminate the specific structures to be detected from the regions of interest of the segmented image.

Methods for segmenting images and detecting specific structures

A method provides for estimating the concentration of a tracer in a tissue structure assembly including at least one tissue structure, from a measurement image of the tracer concentration in said tissue structure assembly, which is obtained by an imaging apparatus, wherein said image includes at least one space domain inside which the tracer concentration is homogenous and at least one region of interest in which the tracer concentration is measured. The method includes: determining a geometric transfer matrix having coefficients representative of the contribution of the space domains in the measurement of the tracer concentration in the regions of interest; optimizing the coefficient of the geometric transfer matrix by defining the best regions of interest in terms of errors in order to measure the tracer concentration, the definition of the regions of interest being carried out according to an iterative loop that includes the following steps upon each iteration: modifying the regions of interest, and calculating the coefficients of the geometric transfer matrix from the modified regions of interest; selecting an optimized geometric transfer matrix among the calculated geometric transfer matrices; and estimating the tracer concentration from the optimized geometric transfer matrix.

Method for estimating the concentration of a tracer in a tissue structure assembly, and corresponding storage medium and device

This extraction method in a structure of a living organism from a measurement image of the kinetics of the active ingredient comprising a plurality of regions of interest inside each of which the kinetics of the active ingredient are measured, comprises the following steps:

Method for simultaneously extracting the input function and pharmacokinetic parameters of an active ingredient

The present invention relates to a method of segmenting a starting image or sequence of tridimensional images for obtaining a tridimensional segmentation image comprising a partition into regions of interest, said image or sequence of images comprising measurements, for each voxel and in the course of n time intervals (n&#x2267;1), of the real evolution of a signal representative of at least one variable of said image or sequence, which comprises essentially:

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Paris, France

Renaud Maroy