. The heart and the aorta; studies in clinical radiology . the pulsa-tion of the heart has not advanced much yet, not becauseit lacks interest, but because of difficulties of a technicalnature. Radioscopy gives only a glimpse of the heartpulsations, but this little is of sufficient value in differentcardiopathies to attract attention. It will be necessary in order to record the constantmovement of the different parts of the heart that cine-mato-radiography should become a method more con-stantly used. It alone will be able to record the heartchanges, that is, the succession, the amplitude, eve
. The heart and the aorta; studies in clinical radiology . the pulsa-tion of the heart has not advanced much yet, not becauseit lacks interest, but because of difficulties of a technicalnature. Radioscopy gives only a glimpse of the heartpulsations, but this little is of sufficient value in differentcardiopathies to attract attention. It will be necessary in order to record the constantmovement of the different parts of the heart that cine-mato-radiography should become a method more con-stantly used. It alone will be able to record the heartchanges, that is, the succession, the amplitude, even theform of the contraction of the different parts of the shall perhaps be able then to easily recognize aortic SHADOW OF HEART IN NORMAL STATE 37 insufficiency by simply observing the ample systolic re-traction of the ventricular shadow; cardiac insufficiencyby the lagging undulation of the left side of the heart;tachycardiac attack by the sudden explosion of the pulsa-tions; mitral stricture by the intensity of the auricularcontraction, Fig. 12. TEACINGS TAKEN IN THE VERTICAL POSITION Black lines, quiet respiration. Dotted lines, forced expiration. Dot-and-dash lines, forced inspiration. A. W. Crane,8 starting from the work of Gocht andRosenthal, has succeeded in making radiographic trac-ings of the heart pulsation. He proceeds in the followingmanner: he covers the precordial region with a sheet oflead, in which he makes narrow horizontal openings, insuch a way that only certain parts of the cardiac outlineare projected on the sensitive plate. These openings maybe multiplied over the ventricular, auricular, aortic andother contours. A radiographic film is slipped in frontof these openings, with the rapidity requisite, during ex-posure of the thorax to the x-rays from back to are thus obtained comparable to sphygmogramsand electro-cardiograms. The strength or the weakness 8 A. W. Crane, Roentgenology of the Heart. (American Roentgen RaySociety, a
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