CT and MRI of the head are mainly for scanning of the head, which generally reveals intracranial lesions such as occupancies, infarcts and hemorrhages, and MRI can also detect intracranial demyelination. Enhanced CT and MRI scans of the head can also be performed. For enhanced CT and MRI scans of the head, contrast is usually required to determine the nature of intracranial occupational disease. CT and MRI of the head can be used to examine the cerebral vasculature to detect the presence of malformations, aneurysms, the degree of atherosclerosis, and the presence of stenosis or plaque formation.