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JAMA. 1920;74(11):723-731. doi:10.1001/jama.1920.02620110013005.
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Roentgen-ray investigation of the living heart was begun more than a decade ago. Groedel,1 Dietlen,2 Moritz,3 Claytor,4 Merrill,4 Veith,5 Bordet6 and Vaquez6 were active in forwarding the work. The late Dr. Walter James Dodd took up the subject at the Massachusetts General Hospital some ten years ago, and established a routine method of cardiac examination. A few years later Dr. George W. Holmes7 added his efforts to those of Dr. Dodd, and has continued the work since the untimely death of the latter. A careful comparison of the percussion outlines with the roentgenographic outlines of the heart was rendered possible through the cooperation of Dr. George C. Shattuck of the medical service of the Massachusetts General Hospital. His findings and an excellent review of the literature were published8 in 1916. The work of these investigators was for the most part


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