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Restrictive anorexia nervosa and TOCs are psychiatric diseases which shares a common pathophysiological substrate We hypothesize that anorexia patients and patients with OCD have structural and functional changes in the accumbofrontal tract. The main objective of this study will be to compare the structure and the connectivity of this tract in MRI with diffusion sequences (DTI tractography) and resting-state, in 3 distinct populations of anorexic patients, patients with OCD and healthy patients. The role of the accumbo-frontal tract in the cortico-striato-hypothalamo-cortical circuit seems to be established. DTI tractography will allow the measurement of functional anisotropy (FA), a parameter that evaluates the diffusion of water molecules along the white matter fibers, and therefore the potential alteration of the studied tract. Resting state sequences will allow to estimate the BOLD signal and the functionality of the tract.