Our department has played a pivotal role in the advances in medical physics, radiological physics and biomedical engineering in the Catholic University of Korea, as well as in the education of graduate students on the master's or doctor's course in the college of medicine and interdisciplinary medicine-medical science school, and the advanced researches in cooperation with the Research Institute of Biomedical Engineering, the Research Laboratory of Magnetic Resonance Imaging, the Research Laboratory of Radiotherapeutic Physics and the Research Laboratory of Medical Imaging under the Catholic Research Institutes of Medical Sciences . In addition, we have taken part directly in the examinations and quality control at the Departments of Diagnostic Radiology, Therapeutic Radiology and Nuclear Medicine in the hospitals, and have been concerned directly in in-depth diagnosis based on qualitative and quantitative analysis of biometabolites by magnetic resonance spectroscopy, advances in the diagnosis by nuclear imaging and even stereotatic radiosurgery with in-depth 3-D radiotherapy for brain tumors. In addition to these, in cooperation with obstetrics &gynecology, dentistry and other clinical departments, we have contributed to the improvement of medical services on the basis of biomedical engineering. Moreover, we have also devoted ourselves to educational activities including education of physics course in Kyonggi University having partnership with the Catholic University of Korea College of Medicine, and a number of invited lectures. In particular, as almost the only research institute specializing in radiation biomedical engineering in Korea, we established the Department of Biomedical Engineering' in order to reinforce our research competitiveness. Since we were designated as a NRL (principal investigator: Professor Seo, Tae-seok) in July, 2001, we have driven the development of high-tech medical technologies using radiation funded by the Government. Currently, we are performing the Phase II research. As a core in radiotherapeutic engineering field, our department has laid groundwork for competitive research performance including industry-academic cooperative studies, cooperation with domestic/foreign