Hokkaido University’s Global Institution for Collaborative Research and Education (GI-CoRE) hosted the annual 4D Treatment Workshop for Particle Therapy over a two-day period from December 7th to 8th, 2018. Held annually in Europe for the last 10 years, this marks the first year that a non-European institution has hosted the workshop. Attendees included students and researchers from various universities around the world who specialize in developing and improving cancer therapies utilizing high-powered proton beams. The workshop was co-organized by Professor Shinichi Shimizu from Hokkaido University’s Faculty of Medicine and GI-CoRE and Associate Professor Antje Knopf from the University of Groningen, with support provided by Hokkaido University Faculty of Engineering Associate Professor Naoki Miyamoto.