Identifier: americanjournroen07ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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out-line makes the distinctive features of itsshape more conspicuous and the conclusionmore obvious. The determination of the position of thispoint rests on the ability to recognize thepoint at which the ventricular motion differsfrom the auricular. At this point there is asort of walking-beam action with theformation of a node of no motionwhich is not entirely stationary but movesup and down along the left border. Thepoint is selected at the lowest point of its travel, representing the phase of heartaction when the ventricle is contracted andthe auricle at least in part dilated. Whateverthe exact anatomical position may be,this gives the most nearly characteristicdiagrams. The next figure (Fig. 3) shows theconventional dimensions introduced withthe proper notations. We still report the MRand ML dimensions, mainly to satisfy theinternist, since by these he checks hispercussion. They have, however, a verysubsidiary value, depending as they do uponso many factors that can be but poorly
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Fig. 3. Completed Orthodiogram. Actual area, 92sq. cm.; average for the patients weight, 78 sq.ao ^ 75od 51 a-v ratio, 1.42. evaluated. To a minor degree, the samecriticism applies to the ratio of the width ofthe heart shadow to that of the thorax,recently revived by Shattuck. The obliquediameter also is of doubtful and only indi-rect value. The long diameter, on the otherhand, is of the greatest importance and isthe basis of the determination of the area bycalculation. It is only necessary to point out that theso-called oblique diameter extending fromthe auriculo-diaphragmatic angle to the left Use of the Fluoroscope in Examining the.Heart auriculo-ventriciilar junction roughly cor-responds to the dividing line between theauricles and the ventricles. The area aboveand to the right of this line is therefore arough index of the auricular area, while thatto the left and below represents the size ofthe two ventricles. In our own work we haveattempted to reduce this to a numerical basisby

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