In this paper, we propose a multispectral analysis system using wavelet based Principal Component Analysis (PCA), to improve the brain tissue classification from MRI images. Global transforms like PCA often neglects significant small abnormality details, while dealing with a massive amount of multispectral data. In order to resolve this issue, input dataset is expanded by detail coefficients from multisignal wavelet analysis. Then, PCA is applied on the new dataset to perform feature analysis. Finally, an unsupervised classification with Fuzzy C-Means clustering algorithm is used to measure the improvement in reproducibility and accuracy of the results. A detailed comparative analysis of classified tissues with those from conventional PCA is also carried out. Proposed method yielded good improvement in classification of small abnormalities with high sensitivity/accuracy values, 98.9/98.3, for clinical analysis. Experimental results from synthetic and clinical data recommend the new method as a promising approach in brain tissue analysis.
Description:
I.J. Image, Graphics and Signal Processing, 2013, 8, 29-36
Kannan, Balakrishnan; Anil, Kumar; Sindhumol, S(Elsevier, July 30, 2013)
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Abstract:
A spectral angle based feature extraction method, Spectral Clustering Independent Component Analysis
(SC-ICA), is proposed in this work to improve the brain tissue classification from Magnetic Resonance
Images (MRI). SC-ICA provides equal priority to global and local features; thereby it tries to resolve the
inefficiency of conventional approaches in abnormal tissue extraction. First, input multispectral MRI is
divided into different clusters by a spectral distance based clustering. Then, Independent Component
Analysis (ICA) is applied on the clustered data, in conjunction with Support Vector Machines (SVM)
for brain tissue analysis. Normal and abnormal datasets, consisting of real and synthetic T1-weighted,
T2-weighted and proton density/fluid-attenuated inversion recovery images, were used to evaluate the
performance of the new method. Comparative analysis with ICA based SVM and other conventional
classifiers established the stability and efficiency of SC-ICA based classification, especially in reproduction
of small abnormalities. Clinical abnormal case analysis demonstrated it through the highest Tanimoto
Index/accuracy values, 0.75/98.8%, observed against ICA based SVM results, 0.17/96.1%, for reproduced
lesions. Experimental results recommend the proposed method as a promising approach in clinical and
pathological studies of brain diseases
Description:
Biomedical Signal Processing and Control 8 (2013) 667– 674