Other Brain Segmentation Techniques

Many useful techniques are presented in Clarke et al.'s survey of segmentation methods for MR images [8] where the important question of validation is also discussed. Techniques for segmenting the brain can be divided into three main groups: simple threshold-based extraction of the brain followed by refinement of brain contours; new atlas-based methods; and statistical and region-growing methods. In the following we summarize some examples by assuming that intensity inhomogeneity has been corrected using a method such as that of Sled et al. [28] so that thresholding techniques can be used. Semiautomatic methods such as [35], where an automatic threshold is found to guide the operator, are not considered here.

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