Andre Edmond Marie Bocage patented the concepts of tomography in 1921. These described how by simultaneously moving the x-ray source and detector in a synchronised motion, a blurred tomogram resulted.
” During the war, Parisian radiologist André Brocage acquired important insights that led him to be known as the “father of tomography”. He described the idea behind tomography – the basic principle of which concerned the radiation tube and the film changing position in respect to the body – but never put it into practice. “
http://www.inventingeurope.eu/story/x-raying-europe-in-3d