LoAd: a locally adaptive cortical segmentation algorithm.

LoAd: a locally adaptive cortical segmentation algorithm.
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DOI:
10.1016/j.neuroimage.2011.02.013
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发表时间:
2011-06-01
期刊:
影响因子:
5.7
通讯作者:
Ourselin, Sebastien
Ourselin, Sebastien
中科院分区:
医学1区
文献类型:
--
作者:
Cardoso, M. Jorge;Clarkson, Matthew J.;Ridgway, Gerard R.;Modat, Marc;Fox, Nick C.;Ourselin, Sebastien

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Thickness measurements of the cerebral cortex can aid diagnosis and provide valuable information about the temporal evolution of diseases such as Alzheimer's, Huntington's, and schizophrenia. Methods that measure the thickness of the cerebral cortex from in-vivo magnetic resonance (MR) images rely on an accurate segmentation of the MR data. However, segmenting the cortex in a robust and accurate way still poses a challenge due to the presence of noise, intensity non-uniformity, partial volume effects, the limited resolution of MRI and the highly convoluted shape of the cortical folds. Beginning with a well-established probabilistic segmentation model with anatomical tissue priors, we propose three post-processing refinements: a novel modification of the prior information to reduce segmentation bias; introduction of explicit partial volume classes; and a locally varying MRF-based model for enhancement of sulci and gyri. Experiments performed on a new digital phantom, on BrainWeb data and on data from the Alzheimer's Disease Neuroimaging Initiative (ADNI) show statistically significant improvements in Dice scores and PV estimation (p<10−3) and also increased thickness estimation accuracy when compared to three well established techniques.
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