“The electrocardiographic curves, however, are but the expression of the excitation wave as it passes through the heart. Alexander Lambert, who, in discussing the electrocardiograph, says (1): The need for such an instrument is expressed by Dr. Numerous attempts have been made to register the motion of the human heart on X-ray films.
The name “Roentgen-ray Cardiograph” is applied to this instrument. The use of a multiple-slit plate gives a number of such waves, indicating the motion of the different portions of the heart border, and these, taken collectively, outline the entire heart. With this motion there is produced on the film a wave representing the movement of a definite portion of the heart lying above a particular slit. The heart and the slits are stationary with respect to each other so that the same heart area is always exposed in the same slit and the only motion recorded, therefore, is the lateral motion of the heart border itself.
#Cardiograph series
By moving the photographic film underneath the multiple-slit plate, a series of exposures are produced on the film by the impinging X-rays through each slit. A single X-ray film is made to register the motion in different parts of the heart during one or more cardiac cycles. AN instrument is here described that will make separate X-ray exposures of the different phases of motion of the human heart through slits in a metal plate opaque to X-rays.
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