This article is dedicated to Magnus Strandqvist's famous doctoral thes
is ''Studien uber die kumulative Wirkung der Rontgenstrahlen bei Frakt
ionierung. Erfahrungen aus dem Radiumhemmet an 280 Haut- und Lippenkar
zinomen'' published in Acta Radiologica in 1944. After a short biograp
hy of Strandquist some central points of his work and their influence
on future development of modern radiotherapy are presented.