File:Practical electro-therapeutics and X-ray therapy - with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray (1912) (14570508030).jpg

Identifier: practicalelectro00mart (find matches)
Title: Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray
Year: 1912 (1910s)
Authors: Martin, James Madison, 1866-1947
Subjects: Electrotherapeutics X-rays Diagnosis, Radioscopic Eye Electric Stimulation Therapy X-Ray Therapy Ophthalmologic Surgical Procedures
Publisher: St. Louis : C.V. Mosby
Contributing Library: Francis A. Countway Library of Medicine
Digitizing Sponsor: Open Knowledge Commons and Harvard Medical School

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lac-ing the indicator ball and cone just that far removed from the frontplane of the cornea, and it should be borne in mind that the frontof the cornea is 10 millimeters in front of the shadow of the indi-cator ball, as shown in the negatives. Some object, such as a candle or a piece of white paper, that canbe readily seen by the patient, should be placed in alignment with X-RAY IN EYE SURGERY 395 the sights of the indicator, but several feet removed therefrom, andthe patient should be instructed to look constantly at this objectwhile the two exposures are being made. The first exposure shouldbe made with the light perpendicular to the plane of the plate andparallel with the patients eyes, thereby superimposing the shadowsof the indicator ball and cone and their supporting stems, as shownin Fig. 210 (1). The x-ray tube is then shifted toward the patientsfeet 4 or 5 inches, and tilted so that the indicator rod points to theball of the localizer, thereby causing the central rays to pass
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Fig. 209.—X-ray in eye surgery. Oblique position. obliquely through the center of the cornea of the patients affectedeye, as shown in Fig. 209. The photographic plate must now beshifted by pushing the plate-holder inward by its handle as far asit will go, thereby protecting that portion that was acted upon bythe rays in the first exposure, and bring its unexposed half in properposition to receive the rays from the second exposure. In this posi-tion the second exposure is made, with the rays falling obliquelyupon the indicators, separating their shadows as seen in Fig.210 (1). 396 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY The exposures need not be made with the light at any specific dis-tance from the plate, or even the same distance for the two ex-

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