. The principles and practice of roentgenological technique . nthe hand. A double foot switch is used to givea weak or strong current as needed. fluoroscopy, it nevertheless offers a certainamount of protection to the operator. Fromthe lower edge of the frame of the screenshould be suspended an apron of lead rubberat least eighteen inches long and as wide asthe screen. Several cuts in this will permitthe use of the palpation spoons. Handlessheathed in lead are attached to the frame forprotection of the hands when manipulating TRACING OF FLUOROSCOPIC LMAGE 115 the screen. The old fluoroscopic v
. The principles and practice of roentgenological technique . nthe hand. A double foot switch is used to givea weak or strong current as needed. fluoroscopy, it nevertheless offers a certainamount of protection to the operator. Fromthe lower edge of the frame of the screenshould be suspended an apron of lead rubberat least eighteen inches long and as wide asthe screen. Several cuts in this will permitthe use of the palpation spoons. Handlessheathed in lead are attached to the frame forprotection of the hands when manipulating TRACING OF FLUOROSCOPIC LMAGE 115 the screen. The old fluoroscopic viewing boxconsisted of a small screen attached to a pyra-midal hood of cardboard, the eyes being ap-plied to the smaller end, so that the examina-tion could be made in a lighted room. Thishas come into vogue again because of militaryneeds. Such a pyramidal fluoroscopic screen hasbeen described by Dessani (Fig. 153). It is to befitted to the wearers eyes and kept in positionby bands across the head. By a hinged ar-rangement the fiuoroscooe mav be tilted back. Fig. 152.—Side view of trochoscope with the tabletop removed. out of the line of vision, ^^hen so done, theobserver looks through a layer of ruby orgreen glass, which permits operative procedurewithout desensitizing the eyes. ProtectionToo great emphasis cannot be laid on theproblem of protection. The Roentgen Ray isan agent capable of causing considerable dam-age to the organism. Though this appears tobe generally appreciated, it is nevertheless sur-prising to note the utter disregard of thisdanger during fluoroscopy, particularly withthe use of the Coolidge tube, where many ofthe limitations which gave a certain margin ofsafety when the Crookes tube was used, do not
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