Dementia is a neurological disorder characterized by a decline in cognition that is significant enough to interfere with the activities of daily living. According to the DSM-5, this condition is best represented as a syndrome rather than one disease. The complexity of its clinical manifestations and diagnostic approaches presents several challenges for the medical community. In this review article, we discuss the role of imaging findings in dementia spectrum disorders in order to improve the comprehensive approach to this multifaceted condition. All the imaging modalities and radiologic findings described in this article pertain to the most prevalent forms of dementia. Dementia brain scanning techniques include structural imaging (MRI, CT) and functional imaging (DTI, MR spectroscopy, PET, and SPECT). Our review found that structural and functional imaging methods are essential when evaluating the dementia spectrum. A substantial decline in cognitive function characterizes this neurological disorder, and every imaging study has its indications, specific findings, and limitations. Due to the similarity in anatomical and functional changes of these disorders, neuroimaging is anticipated to play a significant role in the elucidation and precise diagnosis and management of these patients.