. The American journal of roentgenology, radium therapy and nuclear medicine . logical Service. It is extremely rapid,reasonably accurate, and, as it requires aminimum of manipulation it is likeh to bethe method of preference for work in theevacuation hospitals. In this, as in theother methods here described, it is assumedthat the standard apparatus adopted bythe .v-ray division of the army will be used. The apparatus supphed for the standardequipment includes a substantial brassframe, carrying two wires firmly attachedacross two opposite comers and protectedby a thin sheet of aluminum. These
. The American journal of roentgenology, radium therapy and nuclear medicine . logical Service. It is extremely rapid,reasonably accurate, and, as it requires aminimum of manipulation it is likeh to bethe method of preference for work in theevacuation hospitals. In this, as in theother methods here described, it is assumedthat the standard apparatus adopted bythe .v-ray division of the army will be used. The apparatus supphed for the standardequipment includes a substantial brassframe, carrying two wires firmly attachedacross two opposite comers and protectedby a thin sheet of aluminum. These wiresmove with the tube box and when the dia-mond-shaped shutter is wide open theywould cast shadows upon the fluorescentscreen and these shadows, of course, movewith the tube box. After bringing theshadow of the projectile to the center of 2 12 Localization of Foreign Bodies the fluoroscopic screen and marking theskin through the opening provided, theoperator places in position a small cellu-loid scale with two sliders. He then shiftsthe tube until the shadow of one of the. Pz P> Fig. i. Prinxiple of th^e Method A Above-Simple Slider for Measurement of the Distanxebetween the Two Images Shown below Diagram. wires carried by the box coincides with thenow displaced shadow of the projectileand adjusts one of the sliders to markthis position; then shifting in the oppositedirection and leaving the first slider andthe center of the device fixed, the shadowof the other wire is brought to coincidencewith that of the projectile and the secondslider fixed accordingly. The distance be-tween these two markers is in a definiteproportion to the distance from the fluoro-scopic screen to the projectile in question,and by means of a properly designed scalethe depth in centimeters and fractions of acentimeter can be read directly. In casethe central point of the screen is not incontact with the skin where a mark ismade, it will be necessary to correct forthe distance between the skin and the
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