The New Jersey Institute of Technology's
Electronic Theses & Dissertations Project

Title:	Differentiating schizophrenic patients from healthy control; application of machine learning to resting state fmri
Author:	Ebrahimi Nezhad, Hossein
View Online:	njit-etd2014-030 (x, 41 pages ~ 1.8 MB pdf)
Department:	Department of Biomedical Engineering
Degree:	Master of Science
Program:	Biomedical Engineering
Document Type:	Thesis
Advisory Committee:	Biswal, Bharat (Committee chair) Di, Xin (Committee member) Wei, Zhi (Committee member)
Date:	2014-01
Keywords:	Machine learning Amplitude of low-frequency fluctuations (ALFF) Fractional amplitude of low-frequency fluctuations (fALFF)
Availability:	Unrestricted
Abstract:	In recent years, one analysis approach that has grown in popularity is the use of machine learning algorithms to train classifiers to decode stimuli, mental states, behaviors and other variables of interest from fMRI data. Most of these studies focus on fMRI low frequency oscillations. This study focuses on the amplitude of low-frequency fluctuations (ALFF) and fractional amplitude of low-frequency fluctuations (fALFF). A Voxel-wise analysis is performed on the whole brain for two groups of subjects. A machine learning algorithm is applied to two independent groups of subjects (a total of 160 healthy control and schizophrenic subjects) to classify Schizophrenia subjects from healthy control. Kendall tau rank correlation coefficient is also used to dominate most important voxels (features). This study is done on three datasets: a) fALFF b) mALFF dataset and c) combination of mALFF and fALFF. The results show that using the combination dataset improves the classification and demonstrates that machine learning algorithms can extract new information from a resting state image of schizophrenia which can help in diagnosing and treating schizophrenic patients in the future. Future studies can focus on testing these algorithms on different modalities and moreover on different physiological disorders.