|Neuroimaging is a relatively new science which uses various techniques to either directly or indirectly or indirectly image the structure, function or pharmacology of Nervous System. Various brain imaging techniques are Computed axial tomography, Diffuse optical imaging, Event-related optical signal, Magnetic resonance imaging etc. Neuroimaging is used to diagonize and to evaluate the treatment outcomes of various neurological, psychiatric and CNS disorders. 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.