File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14757463965).jpg

Identifier: americanjournroen07ameruoft (find matches)
Title: The American journal of roentgenology, radium therapy and nuclear medicine
Year: 1906 (1900s)
Authors: American Radium Society American Roentgen Ray Society
Subjects: Radiotherapy X-rays
Publisher: Springfield, Ill. C.C. Thomas
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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eon .r-ray plates of standard makes issued bythe army. The plates were developed bythe tank method, with Eastman .r-ray de-veloper. The transformer was one of theBase Hospital types issued by the army. Theexposures were timed by a special timer,depending upon the principle of fallingweights, its correctness having been checkedby stop-watch and metronome. Because ofthe shortness of the exposures, it wasthought necessary to time them for a defin-ite perifxl of the cardiac cycle, in order toavoid possible variations in size due tosystole and diastole. The timer w^as there-fore actuated by a special mechanism set offby the pulse wave (Fig. 5). This was merelyan adaptation of the wrist piece and tam-bour of the Mackenzie polygraph, with thewriting arm ecjuipped with a platinum endthat dipped into a mercury cup to close theelectric circuit which actuated the timer.The timer could be set to make the exposurewith the pulse beat or at definite fractionsof a second after the pulse (Fig. 17). In
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Fig. 7. RoEXTGEXOGRAM Being Takex ix the LowPressure Chamber through the 15 mm.Aluminum Window. our serial plates with the rebreather, theexposures were timed to be synchronouswith the diastolic phase of the heart cycle.A record of the respiratory phase of theexposure was made by means of a perfora-tion of the kymograph tracing b^• a high IHili^^^lHrii il^^^^Vf 1 1 1 ^^9P J; 11 ii^^H liPi H HP HIiSu^^^^^^^^^^^^H .li 1 I Jjy^H Fig. 8. Kymo(;;raph Tracing. Case 142. Note at the Iieginning the irregularity of the respiratory curve(psychic), and toward the end the greatly in:reased depth due to oxygen want. 72 The Aviators Heart tension spark. This spark was obtained byshunting off through resistance a smallamount of current from the primary termi-nals of the .r-ray transformer, and thenstepping it up to a high tension and passingit through a small Leyden jar as a con-denser. (Figs. 6 and 8.) Legend Reap. Accor 0,% »ii Diast. B. p. deci!. per min. PuisPuU< • . ••• Syst. B. P

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