DTI may refer to: Science and technology Deep trench isolation; See Shallow trench isolation Dial test indicator Direct trader input, in the history of electronic data interchange Diffusion tensor imaging, a structural medical imaging technique Direct thrombin inhibitor Diesel turbo injection, a brand name for common rail Direct tension indicator Deep tissue injury, see suspected deep tissue injury in List of medical abbreviations: S Dye transfer inhibitor Organizations Defence Technology Institute, the Thai defence technology public organisation Department of Trade and Industry (disambiguation), a government department in several countries Detroit, Toledo and Ironton Railroad Diversified Technology, Inc. Directorate of Terrorist Identities, responsible for the Terrorist Identities Datamart Environment Other uses Debt-to-income ratio, in the mortgage industry