 IOMP was formed in January 1963 initially with 4 affiliated national member organizations (Canada, Sweden, UK, USA).After 50 years of active existence and global support for the medical physics profession, IOMP has a membership of 80 national member organizations and 6 regional organizations.IOMP is affiliated to IUPESM, IUPAP and ICSU and is officially connected to IFMBE.