Method for robust scale-space analysis of 3d local...

Details Method for robust scale-space analysis of 3d local... Method for robust scale-space analysis of 3d local...

G - Physics

06

T

G06T 7/00 (2006.01)

Patent

CA 2532656

A method for determining the location, shape and orientation of a tumor in a medical image includes finding a plurality of spatial extrema ~ of a D- dimensional spatial signal ~ for a set of bandwidths H by performing (11) mean shift-based gradient-ascent iterations for a set of bandwidthsH and then determining (12) a D-dimensional spread and orientation of the signal about each extrema ~ by estimating a covariance .SIGMA. of the signal ~ for each extrema ~ . The optimal estimate of ~ and .SIGMA. is determined by performing (13) a Jensen-Shannon divergence on the full set ~ of and .SIGMA. .

L'invention concerne un procédé permettant de déterminer l'emplacement, la forme et l'orientation d'une tumeur sur une image médicale. Ce procédé consiste à définir une pluralité d'extrema spatiaux µ d'un signal spatial D-dimensionnel f pour un ensemble de largeurs de bandes <I>H</I>. Ce procédé consiste en particulier à effectuer (11) des itérations de montée de gradient moyennes basées sur le décalage, pour un ensemble de largeurs de bandes <I>H</I> ; puis à déterminer (12) la propagation et l'orientation D-dimensionnelles du signal au niveau de chaque extremum µ, par l'estimation d'une covariance .SIGMA. du signal f pour chaque extremum µ. L'estimation optimale de µ et .SIGMA. est obtenue par l'application (13) d'une divergence Jensen-Shannon sur l'intégralité de l'ensemble de µ et .SIGMA..

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