|The utilization of various neuroimaging modalities to illuminate the structural and functional abnormalities detected in neuropsychiatric brain disorders has reached an unprecedented stage of evolvement in the medical community. Advances in structural and functional brain imaging technologies enable the medical community to discover the neurobiological basis of neurological illness in a very precise and dependable manner. Neuroimaging tools such as PET, SPECT and MRI have been better developed in order to further the neuroanatomical and neurophysiological basis of mental illnesses and cognitive disorders. With the advent of radiological innovation in neuroimaging, the focus in the medical community has shifted from the examination and study of single brain regions perhaps responsible for a specific psychiatric illness, to the critical examination of integrated brain systems which may be responsible for the phenotypic expressions of these illnesses. Imaging techniques have now made it quite clear that we must begin to investigate the neural networks involved in the pathophysiology of neuropsychiatric disorder.
The impact factor of journal provides quantitative assessment tool for grading, evaluating, sorting and comparing journals of similar kind. It reflects the average number of citations to recent articles published in science and social science journals in a particular year or period, and is frequently used as a proxy for the relative importance of a journal within its field. It is first devised by Eugene Garfield, the founder of the Institute for Scientific Information.The impact factor of a journal is evaluated by dividing the number of current year citations to the source items published in that journal during the previous two years.