. The heart and the aorta; studies in clinical radiology . Fig. 19. ORTHODIAGRAM TAKEN IN THE LEFT POSTERIOROBLIQUE POSITION AT 50 DEGREES OD, right auricle; OG, left auricle; VG, left ventricle; p, apex of theheart. the left ventricle below; during radioscopic examination,the pulsations of the apex at p are clearly seen. Right anterior oblique position. This position is in away the inverse of the preceding. The normal ray entersat the left posterior thoracic wall and comes out through SHADOW OF HEART IN NORMAL STATE 45 the right antero-lateral thoracic region (Fig. 20); the right auricle and
. The heart and the aorta; studies in clinical radiology . Fig. 19. ORTHODIAGRAM TAKEN IN THE LEFT POSTERIOROBLIQUE POSITION AT 50 DEGREES OD, right auricle; OG, left auricle; VG, left ventricle; p, apex of theheart. the left ventricle below; during radioscopic examination,the pulsations of the apex at p are clearly seen. Right anterior oblique position. This position is in away the inverse of the preceding. The normal ray entersat the left posterior thoracic wall and comes out through SHADOW OF HEART IN NORMAL STATE 45 the right antero-lateral thoracic region (Fig. 20); the right auricle and the right ventricle are nearer Fig. 20. ANATOMICAL CROSS-SECTION IN THE RIGHT ANTERIOROBLIQUE POSITION In Fig. 21, the left contour, the outline of which is seenin the retro-cardiac clear space, does not show, at 50 de-grees at least, the right but the left auricle. The posteriorwall of this cavity is found to be nearest the dorsal wallof the body. If the bi-scapular axis describes an anglegreater than 50 degrees, the left auricle shows more; if,on the contrary, the angle is less than 50 degrees, it isthe contour of the right auricle which appears. Below the auricular shadow, in the clear space, theright ventricle is outlined. At the right of the figure the contour of the organ out-lines the right auricle above; below and all along thediaphragm, the right ventricle. Left anterior oblique position. The normal ray enters 46 THE HEART AND THE AORTA Fig. 21. OETHODIAGEAM TAKEN IN THE EIGHT ANTEEIOE OBLIQUE POSITION AT 50 DEGEEESOG, left auricle; OD, right auricle; VD, right ventricle. n, T
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