. The American journal of roentgenology, radium therapy and nuclear medicine . e from the same subjecttaken in inspiration (Figs. 11 and 12), sothat the shadows of the metallic markersupon the backs coincided and the shadowsof the vertical rods on the sternum were par-allel, the changes taking place in the shapeand position of the heart during deep respir-ation could be readily seen. It should beborne in mind that every exposure in eachseries was made during the same phase ofthe cardiac cycle. This was usually one-fifthof a second after the pulse wave arrived atthe wrist, but some were set off
. The American journal of roentgenology, radium therapy and nuclear medicine . e from the same subjecttaken in inspiration (Figs. 11 and 12), sothat the shadows of the metallic markersupon the backs coincided and the shadowsof the vertical rods on the sternum were par-allel, the changes taking place in the shapeand position of the heart during deep respir-ation could be readily seen. It should beborne in mind that every exposure in eachseries was made during the same phase ofthe cardiac cycle. This was usually one-fifthof a second after the pulse wave arrived atthe wrist, but some were set off at the mo-ment of the pulse beat. In either case it ispresumed that the heart outline is that ofdiastole. By this method of superimposing platesthe excursion of the diaphragm upward inexpiration was readily demonstrated, and thesimultaneous lowering of the apex of thethoracic cavity was indicated by the lowerposition of the clavicles and of the sternalmarker. This was only a different way ofdemonstrating facts already well known;but the chans^es in the mediastinal contents. Fig. 10. Use of Transparent Scale for QuickMeasurement of the Size of Heart transverse diameter is instantly read off as1.^25 cm. were to us rather surprising. This methodwas supplemented and the results verified bymaking two exposures of the same subjecton one plate (Figs. 13 and 14). The Aviators Heart 73
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