Computer-Assisted Segmentation of White Matter Lesions in 3D MR Images Using Support Vector Machine1

Rationale and Objectives

Brain lesions, especially white matter lesions (WMLs), are associated with cardiac and vascular disease, but also with normal aging. Quantitative analysis of WML in large clinical trials is becoming more and more important.

Materials and Methods

In this article, we present a computer-assisted WML segmentation method, based on local features extracted from multiparametric magnetic resonance imaging (MRI) sequences (ie, T1-weighted, T2-weighted, proton density-weighted, and fluid attenuation inversion recovery MRI scans). A support vector machine classifier is first trained on expert-defined WMLs, and is then used to classify new scans.

Results

Postprocessing analysis further reduces false positives by using anatomic knowledge and measures of distance from the training set.

Conclusions

Cross-validation on a population of 35 patients from three different imaging sites with WMLs of varying sizes, shapes, and locations tests the robustness and accuracy of the proposed segmentation method, compared with the manual segmentation results from two experienced neuroradiologists.

Key Words: White matter lesion segmentation, support vector machine, machine learning