| 1982–1983 | Junior Resident of Radiology, Kyoto University Hospital |
| 1990–1994 | Instructor, Dept. of Therapeutic Radiology, Kyoto University |
| 1993–1994 | Visiting Assistant Professor, Radiation Biology Section, Dept. of Therapeutic Radiology, University of Minnesota |
| 1994– | Assistant Professor, Dept. of Therapeutic Radiology, Kyoto University |
| 2000–2008 | Associate Professor, Vice-chairman, Dept. of Therapeutic Radiology, Kyoto University |
| 2008.1– | Professor, Div. of Radiation Oncology, Hiroshima University Hospital |
| 2009.4– | Professor and chairman, Dept. of Radiation Oncology, |
| Hiroshima University, Graduate School of Biomedical and Health Sciences |
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