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0489][DEHB] Arterial spin labeling evaluation of children with ADHD Muharrem Burak Baytuncaa, Blaise Frederickb, Serkan Surena, Ali Bacanlia, Kemal Utku Yazicia, Dost Ongurc, Onur Ozyurtd and Eyup Sabri Ercana aDepartment of Child and Adolescent Psychiatry, School of Medicine, Ege University, Izmir, Turkey; bMcLean Imaging Center, Department of Psychiatry, Harvard University, Belmont, MA, USA; cDivision of Psychotic Disorders, McLean Hospital, Harvard Medical School, Belmont, MA, USA; dBogazici University Teknopark, Istanbul, Turkey ABSTRACT Introduction: Attention deficit hyperactivity disorder is a neurodevelopmental disorder with a prevalence of 3% to 5% among children. Thus far, researchers have reported abnormalities in medial and orbitofrontal, parietal, cingulate cortices during the cognitive tasks in functional magnetic resonance imaging (fMRI) studies. Arterial Spin Labeling (ASL) is …