Röntgen rays and electro-therapeutics - with chapters on radium and phototherapy (1910) (14571581848)

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:
themeasurement is made of the shadow of the body above each of the balls,and should be followed, especially if the body is some distance away fromthe anterior segment of the globe or is in the orbit. If the foreign body has passed into the orbit, the rotation of theeyeball to insure parallelism of the ocular axis with the plane of theplate leads to a slight error in the determination of the position of the THE CLINICAL APPLICATIONS. 289 metal. To eliminate this error necessitates a knowledge of the angle ofthe orbit with the plate or, its equivalent, the amount of deviation ofthe eyeball from the primarj^ position, and the consideration of thisangle in plotting the diagrammatic circles representing the eyeball. The indicating apparatus is secured to the side of the head corre-sponding to the injured eye, and the tube jDlaced about 12 or 15 inches(30 or 38 cm.) to the opposite side and slightly forward. The patient isin the recumbent posture, to insure steadiness of the head. After the
Text Appearing After Image:
Fig. 170.—Mackenzie Davidsons localizer. indicating rods have been adjusted, the patient fixes an object about 5 to10 feet distant, so placed that the visual axis of the injured eye shall beparallel to the photographic plate. An exposure of from 10 to 20seconds will clearly outline the bones of the orbit, and secure a shadowof any body opaque to the rays in the eyeball or in its neighborhood. Another method of equal accuracy was introduced by MackenzieDavidson, who published a description of it in the British MedicalJournal^ January 1, 1896. Davidsons Metliod. (Fig. 170.)—The theory of this method briefly isas follows :^ The Crookes tube is placed in a holder, which can slidehorizontally. A perpendicular is dropped from the point in the anode of ^The Archives of the Kontgen Ray, May, li 19 290 ELECTEO-THERAPEUTICS. the tube where the X-rays originate on the point where two wires crosseach other at right angles, and one of the wires must be parallel to thehorizontal bar along which