Séance MB8 - Reconstruction d'images médicales / Medical Image Reconstruction
Jour lundi, le 7 mai 2007 Salle TAL Gestion globale d'actifs inc. Président David Gendron
Présentations
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15h30- 15h55 |
Preconditioning Methods for CT Image Reconstruction |
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David Gendron, École Polytechnique de Montréal, Institut de génie biomédical, C.P. 6079, Succ. Centre-ville, Montréal, Québec, Canada, H3C 3A7 Solution of the (ill-posed) tomographic reconstruction problem through iterative methods is obtained at a high computational cost. Edge-preserving l2l1 regularization brings better conditioning, but is non-linear. Fourier domain preconditioners significantly improve solution time for shift-variant linear problems. Such a preconditioner has been developed for our shift-variant non-linear problem, yielding very good results. |