The ONPRC18 Multimodal MRI Atlas includes co-registered templates built from MR images used to characterize macroscopic brain structure (T2/SPACE and T1/MPRAGE), and a diffusion tensor imaging (DTI) template. The DTI template matches to the T1 and T2-weighted images (0.5 mm isotropic) and includes maps of derived DTI parameters (FA, AD, MD, RD, RGB). The ONPRC18 labelmaps delineate 57 bilateral gray matter regions of interest (ROIs; 36 cortical regions and 21 subcortical structures), as well as 74 bilateral white matter tracts. Importantly, the labelmaps overlay the structural and diffusion templates, enabling the same regions to be consistently identified across imaging modalities. A specialized condensed version of the labelmap with 17 larger ROIs is also included to further extend the usefulness of this tool for imaging data with lower spatial resolution, such as functional MRI (fMRI) or positron emission tomography (PET). https://www.sciencedirect.com/science/ar...