Application: tissue classification in T1, T2 MR images.

In this chapter, we apply the k-NN rule to the supervised classification of tissues in pairs of T1- and T2-weighted MR images of the brain. First, we remind the nature of the T1 and T2 signals in MRI, and their medical significance. Then, we review a few supervised methods to classify multi-channel MR images of the brain. Finally, we illustrate this by classifying a T1-T2 pair of images of a brain with multiple sclerosis lesions.