File:American X-ray journal (1903) (14757817482).jpg

Identifier: americanxrayjour1213unse (find matches)
Title: American X-ray journal
Year: 1903 (1900s)
Authors:
Subjects: X-Rays Radiography
Publisher: St. Louis : American X-Ray Publishing Co.
Contributing Library: The College of Physicians of Philadelphia Historical Medical Library
Digitizing Sponsor: Open Knowledge Commons and the National Endowment for the Humanities

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there is no such thing as in-stantaneous skiagraphy. By this phrase *Read by title at the Chicago Meeting of the AmericanRoentgen Ray Society, December 10-11, 1902. vacuum of the tube, and the thickness ofthe part to be skiagraphecl. The time ofexposure has gradually been reduced fromtwo hours (the time of exposure whenthe x-rays were discovered by Prof. Eoent-gen) to as many seconds, the time nowin vogue. The minimum time now usedby me in instantaneous skiagraphy isabout one second; this being the time re- THE AMERICAN X-RAY JOURNAL. quired to skiagraph the hand, and the timeexposures necessary to skiagraph suchparts of the body as the kidney, hip. skull,lung, etc.. vary in direct proportion withthe thickness of the parts. The followingtable will give you an idea of the time-exposures I employ for skiagraphing. Head-Face, 10-15 seconds.Cranium, 40-60 seconds.Thorax, 20-30 seconds.Abdomen, 50-90 seconds.This standard of exposures was attainedafter prolonged experimentations upon in- /
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NORMAL SKULL. EXPOSURE 15 SECONDS. Upper Extremity— Hand, 3 second. Wrist, 2 seconds, Forearm, 3 seconds. Elbow, 3-5 seconds. Shoulder, 10-J5 secondsLower Extremity— Foot. 5-0 seconds. Ankle, 5-G seconds. Leg, 5-7 seconds. Knee, 10-15 seconds. Hip, 40-60 seconds. dividuals that weighed between 125 and145 pounds, and for any increase of weight(say for each 15 pounds increase) anaddition of from 1 to 2 seconds shouldbje estimated. The apparatus which I use is the Queen& Co. 15-inch spark coil, supplied witha 110-volt current. The tube should beof high vacuum; the resistance of theparallel spark gap being from 7y2 to 8^2inches with a 3-inch spark gap in seriesto prevent blackening of the tube. The KASSABIAN.—INSTANTANEOUS SKI A GRA PHY. 43 distance between antikathode platinumplate and the surface of the part that isbeing x-rayed should be from 12 to 15inches. The plate used is especially pre-pared for x-ray work, manufactured by theCramer Co., of St. Louis. Xo intensify-ing sc

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