The 1st World Congress of Nuclear Medicine and Biology held in Japan: a historical review with personal reminiscences.

The 1st World Congress of Nuclear Medicine and Biology was held from September 30 to October 4 1974 in Japan. This was an epoch-making event in the history of Nuclear Medicine in Japan as well as in the World. The huge success of the meeting contributed a lot to the rapid and remarkable progress of nuclear medicine thereafter. The author served as a secretary of the local organizing committee for the Congress. The author would like to record the event summarizing the publications made by the local organization committee. The author would like to share with nuclear medicine professionals of younger generations the unforgettable experiences which he has kept in memory for the past half a century. The author believes this historical review will help to pave the future way of nuclear medicine by recalling how the World Federation and Congress was started with the great efforts of the excellent minds of predecessors.