After graduating from Kitasato University in 2005, Dr. Tojima worked at Ai Animal Clinic in 2006, and in 2008, they became a resident at the iVEAT Comprehensive Care Center. From 2011, Dr. Tojima served as the Deputy Director of the Imaging Diagnosis Department at the Japan Small Animal Medical Center, and from 2017, they became the Director of the same department.