MIDAS Journal - Multiple Sclerosis Detection in Multispectral Magnetic Resonance Images with Principal Components Analysis.

Multiple Sclerosis Detection in Multispectral Magnetic Resonance Images with Principal Components Analysis.

Kroon D., Van Oort E., Slump K.

University of Twente, Institute for Biomedical Technology & Technical Medicine, Signals and Systems

Please use this identifier to cite or link to this publication: http://hdl.handle.net/10380/1441

Published in The MIDAS Journal - MS Lesion Segmentation (MICCAI 2008 Workshop).

Submitted by Dirk-jan Kroon on 07-12-2008.

This paper presents a local feature vector based method for automated Multiple Sclerosis (MS) lesion segmentation of multi spectral MRI data. Twenty datasets from MS patients with FLAIR, T1,T2, MD and FA data with expert annotations are available as training set from the MICCAI 2008 challenge on MS, and 24 test datasets. Our local feature vector method contains neighbourhood voxel intensities, histogram and MS probability atlas information. Principal Component Analysis(PCA) cite{PCA} with log-likelihood ratio is used to classify each voxel. MRI suffers from intensity inhomogenities. We try to correct this ''bias field'' with 3 methods: a genetic algorithm, edge preserving filtering and atlas based correction. A large observer variability exist between expert classifications, but the similarity scores between model and expert classifications are often lower. Our model gives the best classification results with raw data, because bias correction gives artifacts at the edges and flatten large MS lesions.

Reviews

PCA based Local feature vector classification for MS lesion segmentation by Martin Styner on 07-28-2008 for revision #1

expertise: 5 sensitivity: 4.5

The paper presents a MS lesion segmentation using a PCA based local feature vector classification incorporating a given voxel neighborhood.

The evaluations show that the method surprisingly performs better without intensity inhomogeneity correction. This may be an artifact of the employed bias correction methods. A tissue classification based bias correction (Well, Leemput, and many others) may help in this case.

The paper could use another revision and feels in part like a technical report.

Minor:

Page 5 top: "affine fitted" should be "affinely fitted"

Page 7 middle: "non-rigid fit" should be "non-rigidly fit"

Conclusion section: "by by" should be simply "by"

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Review by Simon Warfield on 07-25-2008 for revision #1

expertise: 5 sensitivity: 4.5

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Paper Id:	604
Categories:	Anisotropic blurring filters, Atlas-based segmentation, Blurring filters, Classification, Component Analysis and Discriminants, Data, Deformable registration, Density Estimation, Density Functions, Distance maps, Edge Detection, Error Estimation, Feature extraction, Filtering, Generic Programming, Images, IO, Linear Algebra, Mathematics, Missing and Noisy Features, Multi-modality registration, Optimization, Parameter Techniques, Probability, Programming, Registration, Registration metrics, Registration optimizers, Resampling, Segmentation, Spatial Objects, Thresholding, Transforms
Keywords:	Multiple Sclerosis, Lesions, PCA, MR, Bias Field, Non-rigid Registration, FLAIR, Feature Vector,
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Status:	Open for public review

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