Tissue separation in MR imagesfrom supervised to unsupervised classification ?
In this paper, four projectors are constructed to separate the brain tissues from the multi-spectral magnetic resonance (MR) imagery. The four projectors are the oblique subspace (OB) projector, the maximal signal-to-interference ratio (MSIR) projector, the noise subspace (NS) projector, and independent component (IC) projector, respectively. According to the required amount of a priori knowledge, the designs of proposed projectors are followed from the supervised to the unsupervised requirements. Mean that the OB projector requires all tissue signatures while the IC projector employ no prior information at all for the substance detection. Experimental results have shown that these four projectors are feasible to separate the signatures in magnetic resonance images. Specially, the IC projector has shown the salient ability in detecting the areas of lesions from the abnormal brain MR images.
oblique subspace projector maximal signal-to-interference ratio projector noise subspace projector independent component projector