Identifier: rntgenrayselectr00kass (find matches)
Title: Röntgen rays and electro-therapeutics : with chapters on radium and phototherapy
Year: 1910 (1910s)
Authors: Kassabian, Mihran Krikor, 1870-1910
Subjects: Electrotherapeutics X-rays Phototherapy Radiology Radiotherapy
Publisher: Philadelphia & London : J.B. Lippincott Company
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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Fig. 181.—Levy-Doms orthodiagraph for the standing position. frame is provided with three pencil-holders, or plotters, as they arecalled, which are movable in the plane of the screen or in that of thedrawing plate, and provided with scales in both co-ordinates; the posi-tion of a person with regard to the central ray may be thereby ascertained,so that on the examination being repeated the same position of the per-son may be accurately secured. A fourth auxiliary plotter has been pro-vided with slides on a scale projecting from the extended axis of thelower supporting lever. 324 ELECTRO-THERAPEUTICS. In addition to reproducing the true shape and size of organs, theapparatus may be advantageously used to ascertain the depth of foreignobjects. This can be done by measuring the apparent diameter of theobject when the Rontgen tube is stationary, and then ascertaining theactual shape of the body by means of parallel movement of the drawing
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Reiniger,Gebberh SiSchal!, Enlangen.Fig. 182.—Levj-Dorns orthodiagraph for use in the recumbent posture. stylus and the tube. ISTow if a I is the apparent length of a foreign body,r I its real length, D the distance of the anticathode of the tube from theluminous screen, and d the distance of the object from the anticathode, cl r 1 X D the formula ^ will give the true distance of the foreign body from the luminous screen. The Levy-Dorn orthodiagraph is shown in Figs. 181 and 182. Theadvantage of this instrument lies in the fact that during the examina-tion of the heart the operator measures the vertical and horizontal axeson the scales. B. Skiagraphic Examination of the Heaet. The heart can be skiagraphed with the same technic as is applicableto the lung, but the former requires more precision in the position of thepatient, tube, distance, etc. The patient may be seated on a chair andthe plate placed either over the chest (sternum), in the anterior or

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