Dopamine Transporter Scintigraphy Imaging (DAT-Imaging) in Patients With Lewy Body Dementia

Inclusion Criteria: * Subjects must be adults between 55 to 90 years of age with an established diagnosis for dementia in accordance with DSM-IV criteria and have to fulfil at least one of the following: The ICC criteria for probable and possible DLB, the National Institute of Neurological and Communicative Disorders and Stroke and Alzheimer Disease and Related Disorders Association (NINCDS-ADRDA) for Alzheimer's Disease (AD), or the National Institute of Neurological and Communicative Disorders and Association Internationale Pour la Recherche et l'Enseignement en Neurosciences (NINCS-AIREN) for Vascular Dementia (VaD). Exclusion Criteria: * Subjects are not eligible if they have a Mini Mental State Examination (MMSE) score of \<10 and use medication known or suspected to interact with the striatal uptake DaTSCAN to the dopamine transporter. * Furthermore subjects are not eligible if they were diagnosed with idiopathic Parkinson's Disease (PD), with persistent severe depression, normal pressure hydrocephalus, multiple system atrophy, cortico-basal degeneration or Huntington's Chorea Disease.