Mallinckrodt Institute of Radiology (MIR) is a premier radiological center, providing a full range of diagnostic, therapeutic, and related patient-care services. It is a major resource of Washington University Medical Center, supporting the educational aims of the university and hospitals through teaching programs and supporting and encouraging a variety of basic and applied research, with special emphasis on radiological science. MIR’s mission is complex — it must provide the best cost-effective patient care, educate students to be future leaders in the field, and seek new knowledge to improve diagnosis and treatment of patients. In every respect, MIR desires to achieve excellence at the highest level locally, nationally, and internationally.