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This book represents a remarkable series of studies made with a technic which is just coming into common use. As usual with such matters, the idea was put forth early in the history of roentgenology but was not used until recently when apparatus was worked out and perfected. The original idea was to put a metal grid with a series of narrow slits between the patient and the film, and then, during the exposure, to move either the film or the grid. If, then, as in the case of the heart, there is movement of the walls of the organ, such movement will show up as saw-tooth indentations in the shadow on the film. In this way it is possible to analyze minutely the movements of the various parts of an organ. Furthermore, by passing a fine beam of light through the part of the film containing the saw-tooth indentations
Röntgenkymographische Bewegungslehre innerer Organe. JAMA. 1936;107(15):1245. doi:10.1001/jama.1936.02770410067029