Tustin-based Toshiba America Medical Systems, a manufacturer of diagnostic imaging systems for the healthcare market, said today that it has named Doug Ryan as Vice President, Marketing and Strategic Development, heading up the firm's strategic marketing and U.S. product lines. Ryan has been at Toshiba since 2001, and was most recently senior director of the firm's CT Business Unit. Toshiba America Medical is a manufacturer of CT, MR, ultrasound, and X-Ray vascular equipment, and is a unit of Toshiba Corp.