Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14758140665)

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

Text Appearing Before Image:

cast shadows upon the screen must be removed,to prevent an incorrect diagnosis. In surgical cases where fine detail work is demanded, it is necessaryto remove all the garments from the part to be examined, also splints,bandages, and powder dressings, as acetanilid, iodoform, boric acid, andplaster of Paris, all of which produce shadows upon the screen. Theretention of wooden splints, though offering little or no obstruction to therays, interferes with a thorough examination of a part on account of theimmobilization of the joints, the ends of fractured bones, etc. Thesesplints act as stays and do not permit of any movement of the part orof the close approximation of the screen. 202 ELECTEO-THERAPEUTICS. (c) Position of the Tube.—The tube should be carefully clamped iutothe notch of the holder so that the platinum anode points to the screenscentre, causing it to fluoresce equally. The rays should pass in a straightline and not obliquely from the tube to the object. When examining the

Text Appearing After Image:

nnnrnmiEDv^i ■■ 8 9 Fig. 105.—a Study in Shadow Distortions (Fluoroscopic or Skiagraphic) with Corre-sponding Density Difference.—A, Anode parallel -ndth the photographic plate. B, Axis of the tubeparallel with the plate. C, Tube midway between the above positions. 1, Either position of the object will throw the same shadow; the darker portion indicates thedenser portion, whether the vertex is up or down. 2, Shadow smaller and denser. 3, Same objectslightly enlarged. 4, Cylinder or bone. Shadow denser at the extremities, because the rays must trav-erse more substance at those positions. 5, Metallic cylinder. To ascertain the perpendicularity of therays, cross wires are placed upon both ends, when the shadows of the latter will superimpose on theplate or fluoroscope. If these shadows do not superimpose, the rays are taking an oblique course.6, Penny on its edge. The shadow line is dense, as the rays traverse much substance. 7, Surface viewof the same. 8, Fracture of two bones.

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1910

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