. The heart and the aorta; studies in clinical radiology . egion indicated above (Fig. 17). SHADOW OF HEART IN NORMAL STATE 43 The distance which separates the outline of the heartfrom the shadow of the vertebral column diminishes asthe angle of obliquity diminishes; very narrow at 40 de-grees, it is much larger at 50 degrees. This latter inci-dence is the most favorable for the study of the heartwalls outlined in the retro-cardiac clear space, especiallyfor the study of the left auricle. However, in the case ofpatients whose thorax is underdeveloped or narrow, theangle of obliquity should be
. The heart and the aorta; studies in clinical radiology . egion indicated above (Fig. 17). SHADOW OF HEART IN NORMAL STATE 43 The distance which separates the outline of the heartfrom the shadow of the vertebral column diminishes asthe angle of obliquity diminishes; very narrow at 40 de-grees, it is much larger at 50 degrees. This latter inci-dence is the most favorable for the study of the heartwalls outlined in the retro-cardiac clear space, especiallyfor the study of the left auricle. However, in the case ofpatients whose thorax is underdeveloped or narrow, theangle of obliquity should be as great as 60 degrees. When the volume of the left auricle is increased, thesalience of its shadow is accentuated and its contourapproaches the vertebral column, the reasons for whichhave just been indicated. Its development is known onlyif it is known at what angle the patient was placed. Left posterior oblique position. In this position at anangle of 50 degrees the normal ray penetrates the rightantero-lateral thoracic region and comes out at the left. Fig. 18. ANATOMICAL CKOSS-SECTION IN LEFT POSTEEIOEOBLIQUE POSITION 44 THE HEART AND THE AORTA posterior thoracic region; at the oesophageal zone level,it is tangent to the posterior wall of the two auricles,especially the right auricle. The left auricle and the leftventricle are nearest the observer and the major axis ofthe heart nearly parallel to the plane of the screen (). The apex of the heart on the left ought then to beseen and a projection obtained extending to the externalwall. This is exactly what is shown on the orthodiagram(Fig. 19). On the other hand, in this latter figure, it isseen that the contour of the heart outlines in the clearspace the auricles, notably the right, and toward thediaphragm the lower part of the left ventricle. At theright of the figure the tracing outlines the auricles above,
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