File:The American journal of roentgenology, radium therapy and nuclear medicine (1906) (14755015261).jpg

Identifier: americanjournroen05ameruoft (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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pic process is im-m.aterial. as the steps in its use will beidentical. When a fluoroscopic method is to beused, an auxiliary device may be found ofconsiderable aid in rapidly and accuratelysecuring the requisite data. Such a device isshown in Fig. 14 (a) and consists of threearms, each with a slider very similar to the 240 Localization of Foreign Bodies original compass. In fact the latter maybe used with rather less convenience, byremoving arc, A, and allowing the indi-cating rod to project a short distance be-low the center and with the legs tempora-rily removed. The auxiliary compass hasits arms numbered in the same way as theoriginal Hirtz compass and has a projecting the projectile, for which one of the meth-ods, A, B, or C, should be employed andalso to determine the distance from thescreen to the opaque markers. When usingthe fluoroscopic method, the latter depthcan be very readily determined by simplypassing a suitable measuring rod throughthe perforated screen, which has been
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Fig. 14. Accessory Apparatus for Fluoroscopic Work with Hirtz Compass. (a) Auxiliary compass, pedestal support and three markers with friction clips. (b) Hirtz compass mounted with the three legs at different levels, so that apointer reaches white spot on the base plane below at the center of the sphereof which the curved arc is a part. pin which fits the perforation in the screen.One of the arms is rigidly attached to a ringconcentric with the axis of rotation aboutthe pin, while the other two are movable,but may be clamped by thumb nuts to thering. It is evident that placing the perfora-tion in the screen in the vertical ray passingthrough the projectile definitely fixes theposition of the center post. If then, eachmarker in turn is brought into the verticalray and the arm and slider adjusted so thatthe hole in the slider matches such a pro-jection of each marker, the three openingsin the sliders and the central pin fix thefour points which it is necessary to obtain.It then remains

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