8,867 research outputs found
Integrating semi-supervised label propagation and random forests for multi-atlas based hippocampus segmentation
A novel multi-atlas based image segmentation method is proposed by
integrating a semi-supervised label propagation method and a supervised random
forests method in a pattern recognition based label fusion framework. The
semi-supervised label propagation method takes into consideration local and
global image appearance of images to be segmented and segments the images by
propagating reliable segmentation results obtained by the supervised random
forests method. Particularly, the random forests method is used to train a
regression model based on image patches of atlas images for each voxel of the
images to be segmented. The regression model is used to obtain reliable
segmentation results to guide the label propagation for the segmentation. The
proposed method has been compared with state-of-the-art multi-atlas based image
segmentation methods for segmenting the hippocampus in MR images. The
experiment results have demonstrated that our method obtained superior
segmentation performance.Comment: Accepted paper in IEEE International Symposium on Biomedical Imaging
(ISBI), 201
Dissipation effect in the double-well Bose-Einstein Condensate
Dynamics of the double-well Bose-Einstein condensate subject to energy
dissipation is studied by solving a reduced one-dimensional time-dependent
Gross-Pitaevskii equation numerically. We first reproduce the phase space
diagram of the system without dissipation systematically, and then calculate
evolutionary trajectories of dissipated systems. It is clearly shown that the
dissipation can drive the system to evolve gradually from the -mode
quantum macroscopic self-trapping state, a state with relatively higher energy,
to the lowest energy stationary state in which particles distribute equally in
the two wells. The average phase and phase distribution in each well are
discussed as well. We show that the phase distribution varies slowly in each
well but may exhibit abrupt changes near the barrier. This sudden change occurs
at the minimum position in particle density profile. We also note that the
average phase in each well varies much faster with time than the phase
difference between two wells.Comment: 7 pages, 7 figures, to be published in Euro. Phys. J.
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