Identifier: americanjournroen07ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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tolic and diastolic exposures weremade in the same cycle. Other sets of twoexposures were also made at other times inthe cycle within short periods and under sim-ilar conditions. All exposures were madeduring the phase of normal inspiration, andin the standing position. In Fig. 2 is shown an electrocardiagramfrom one of the subjects showing two dis-charges of the .r-ray transformer, one occur-ring within the R complex and hence occur-ring during the presphygmic period of theventricle, the other at the end of the T waveand hence at the end of ventricular systole. Instantaneous Radiographs of the Human Heart 475 In Figs. 3 and 4 the radiographs from thesedischarges are reproduced and these are su-perposed in Fig. 5 to bring out the differencein the borders of the heart. Superpositionmay be accurately made with the rib outHnes The observations that we have made upto the present time on the normal humanheart enable us to make certain statementsas to the normal movements of the humanheart.
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Fig. 3. Radiograph of Human Heart DuringFull Diastole. and the outlines of the aluminum capsulewhich replaces the usual stethescope bell andwhich may be seen projecting from the leftof each figure. In Figs. 6 and 7 the outlines of two heartsin different phases of the cycle are shown.The radiographs were made as describedabove and the outlines transferred to a singlediagram. The position of the individual ex-posures, as determined from the electrocar-diographic records, are indicated on thediagrammatic electrocardiogram. In Fig. 6the first exposure was made at the end ofsystole of the ventricles, the second in mid-cardiogram. In Fig. 7 the first exposure wasdiastole, and the third immediately beforecontraction of the auricle as indicated by theauricular wave (P wave) of the electro-cardiogram. In Fig. 7 the first exposure wasmade immediately before auricular contrac-tion, the second during the presphvgmic pe-riod of the ventricle, the third near the mid-dle of the period of ventricular

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