Depressed patients inadequately responsive to medication and psychotherapy often live with serious difficulties in psychosocial functioning; thus, repetitive transcranial magnetic stimulation (rTMS) is an important, alternative, FDA approved therapy. During typical rTMS therapy, clinicians place a stimulation coil on the patient's scalp that focally modulates the underlying cortical areas. The left dorsolateral prefrontal cortex region (DLPFC) is the most established target for treating depression; however, clinicians miss this target in a third of patients and treatment fails, likely contributing to the relatively low remission rate of 31%. The reason for errors in targeting the DLPFC is that clinicians typically do not have access to MR image-guidance to identify the underlying brain regions they target. Instead they use the current standard-of-care method to identify the stimulation location that uses scalp landmarks and moves a fixed distance over the scalp. A new, promising alternative scalp targeting approach based on EEG electrode placement, the Beam F3 accurately targeted the DLPFC in 92% of Veterans from our pilot data (n=12). Our collaborator has adopted the Beam F3 as his clinical standard and showed improved depression severity and changes in associated functional Magnetic Resonance Imaging (fMRI) data. Other labs also, have indirect evidence that the Beam F3 scalp targeting approach places the rTMS stimulation coil near an fMRI identified optimal subregion within the DLPFC that involves control over emotional distraction and reactivity. The overall aim of the current proposal is to test the feasibility of accurately reaching this fMRI based optimal subregion using the Beam F3 scalp-based targeting approach. We further hypothesize that, since psychosocial functioning is related to cognitive control that accurate stimulation of this fMRI region could also lead to improved psychosocial functioning (i.e. reduced functional limitations and improved quality of life). Our plan is to collect fMRI and MRI's with markers identifying where clinicians place the Beam F3 location in depressed Veterans. Our strategy is to test whether the Beam F3 rule places the coil close enough (i.e. within the spatial resolution of rTMS) to reach an optimal DLPFC subregion in 95% of Veterans. In Aim 1 we propose to use image-guidance to test with high precision how accurately the Beam F3 targets this optimal, fMRI defined, brain region. In Aim 2 we demonstrate the accuracy of the Beam F3 in rTMS clinic patients where treaters typically deviate from scalp rules to accommodate patient comfort since frontal stimulation causes facial twitches and painful cranial nerve stimulation in some scalp locations. To address clinical importance of our choice of brain targets, in our clinic-based sample we will evaluate whether spatial deviations from the optimal brain target correlate with improvements in psychosocial functioning on a composite score of the World Health Organ...