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LEAP: learning embeddings for atlas propagation.

Abstract：

:We propose a novel framework for the automatic propagation of a set of manually labeled brain atlases to a diverse set of images of a population of subjects. A manifold is learned from a coordinate system embedding that allows the identification of neighborhoods which contain images that are similar based on a chosen criterion. Within the new coordinate system, the initial set of atlases is propagated to all images through a succession of multi-atlas segmentation steps. This breaks the problem of registering images that are very "dissimilar" down into a problem of registering a series of images that are "similar". At the same time, it allows the potentially large deformation between the images to be modeled as a sequence of several smaller deformations. We applied the proposed method to an exemplar region centered around the hippocampus from a set of 30 atlases based on images from young healthy subjects and a dataset of 796 images from elderly dementia patients and age-matched controls enrolled in the Alzheimer's Disease Neuroimaging Initiative (ADNI). We demonstrate an increasing gain in accuracy of the new method, compared to standard multi-atlas segmentation, with increasing distance between the target image and the initial set of atlases in the coordinate embedding, i.e., with a greater difference between atlas and image. For the segmentation of the hippocampus on 182 images for which a manual segmentation is available, we achieved an average overlap (Dice coefficient) of 0.85 with the manual reference.

journal_name

Neuroimage

journal_title

NeuroImage

authors

Wolz R,Aljabar P,Hajnal JV,Hammers A,Rueckert D,Alzheimer's Disease Neuroimaging Initiative.

doi

10.1016/j.neuroimage.2009.09.069

subject

Has Abstract

pub_date

2010-01-15 00:00:00

pages

1316-25

issue

2

eissn

1053-8119

issn

1095-9572

pii

S1053-8119(09)01068-4

journal_volume

49

pub_type

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