. The heart and the aorta; studies in clinical radiology . Radioscopic examination of the right aorta should bemade in two positions: (1) frontal position, the screen incontact with the sterno-costal wall; (2) oblique position,the patient standing, in profile, three-quarters, etc.,behind a fixed screen, parallel to the plane in which thetube moves. 1. Frontal Position. The examination may be madein two ways and the patient observed in the verticalposition or in recumbency; it is always necessary tospecify which has been used, as the contours of the aortapresent, as the case may be, slightly di
. The heart and the aorta; studies in clinical radiology . Radioscopic examination of the right aorta should bemade in two positions: (1) frontal position, the screen incontact with the sterno-costal wall; (2) oblique position,the patient standing, in profile, three-quarters, etc.,behind a fixed screen, parallel to the plane in which thetube moves. 1. Frontal Position. The examination may be madein two ways and the patient observed in the verticalposition or in recumbency; it is always necessary tospecify which has been used, as the contours of the aortapresent, as the case may be, slightly different images. In general, the tracing shows on the right above D(Fig. 144) a sinuous line reentrant as far as Ca and ap-preciably rectilinear from Ca to A. In its first course, AORTITIS 193 this line marks the superior vena cava; in its second sec-tion, it marks the contour of the ascending aorta. Thiscontour rarely goes beyond the sternal shadow in youngpatients; but in adults it may overlap it slightly withouta pathological condition being Fig. 144. CONTOUR OF THE AOETA AND THE HEART IN FRONTAL POSITION The examination of the left side of the patient (rightside of Fig. 144) shows that from A to A is a semi-circular contour of especial interest for it represents theprojection of the upper descending portion of the aorticarch. In this curved line there are two points to con-sider: first, the importance of its development which isnaturally greater according to the space occupied by theaortic arch, and then, the distance which separates itspoint of origin from the sterno-clavicular articulation(st). The aortic semicircle is very clear in adults, still moremarked in the old; it may be lacking in children and theyoung. When there is a volumetric alteration in thevessel, it presents a more or less considerable increaseand the estimate of it constitutes one of the essentialelements of the description of the aorta. This will beconsidered presently. 194 THE HEART AND THE
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