ICRM2018 is the 5th International Conference on Radiation Medicine (ICRM) organized by King Faisal Specialist Hospital & Research Centre (KFSH&RC) in collaboration with leading national and international organizations and professional societies. The previous conferences were successfully organized in 2010, 2012, 2014 and 2016. The last ICRM conference, ICRM2016, was jointly co-organized with the World Health Organization (WHO) and the International Atomic Energy Agency (IAEA). These concerted and integrated organizations strengthen further the overall program for this major scientific event. The primary goal of the ICRM conferences is to bring together renowned clinicians, scientists and other health professionals to share and discuss the current clinical applications and future innovative approaches in the field of radiation medicine. The ultimate objective is to create an environment conducive to promoting basic science, applied research as well as clinical applications in radiation medicine. ICRM2018 Organizing Committee welcomes and encourages all interested people to avail of this unique opportunity.