. The American journal of roentgenology, radium therapy and nuclear medicine . atomical Cross-Section Charts in Estimating X-Ray Dosage work from data obtained by his own efforts,and with his own apparatus (this is un-doubtedly the better method, provided theradiologist be trained in the use of physicalinstruments) the intelligent use of suchdata in a given case rec[uires fairlyaccurate knowledge of the distance of thetumor from the surface, and as much aspossible of the dimensions of the tumor,including foci of dissemination. This in-volves measuring the patient at the levelof the growth pref
. The American journal of roentgenology, radium therapy and nuclear medicine . atomical Cross-Section Charts in Estimating X-Ray Dosage work from data obtained by his own efforts,and with his own apparatus (this is un-doubtedly the better method, provided theradiologist be trained in the use of physicalinstruments) the intelligent use of suchdata in a given case rec[uires fairlyaccurate knowledge of the distance of thetumor from the surface, and as much aspossible of the dimensions of the tumor,including foci of dissemination. This in-volves measuring the patient at the levelof the growth preferably in the form of a degree of distortion. In only one such atlas,to my knowledge, are the sections life-size, and these were made from one bodyonly. In order to fulfill the foregoing require-ments and to meet the objections, aseries of life-size cross-section charts of thetrunk of the average male and female bodywere prepared. To obtain such an average,or what might be termed ideal male andfemale figures, twelve well-formed male,and twelve female subjects, were selected. Fig. 3. Composite contour tracing of twelve female subjects at the level of the lowerportion of the fourth intercostal space. contour sketch, with relation to whichpenetration data may be studied. In this connection it occurred to me thatlife-size cross-section charts of the averagemale and female figure would be verydesirable, and would enable the radiol-ogist to study his penetration data, and todetermine the ratio of depth dose to skindose with relation to the a^■erage humaniigure. Anatomies showing cross-sections arenow available, but the sections were madefrom dead subjects, and present a \ariablc \ arying in weight between 100 and 200 lbs.;in height, between 64 and 74 in.; and in age,between twenty-five and forty years. Ofeach subject, a series of careful contourmeasurements at different le\e!s was ob^■ious reasons, the levels selectedcorrespond to prominent and easily recog-nizable surfa
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