. Elementary and dental radiography / by Howard Riley Raper . late when making stereoradiographs. The same results were ob-tained by the writer with the distance twelve inches as when workingat twentv-four inches. Fig. 329. The lead glass bowl and X-ray tube must be removed while the centering rod isbeing used. When the stand is set, the rod is removed and the protection bowl and X-ray tube replaced. The first step is to centre the tube, to place it Setting so that a line (line F of Fig. 327) drawn from the tlibl Stand. focal point on the target will strike the plate in the center. This may be
. Elementary and dental radiography / by Howard Riley Raper . late when making stereoradiographs. The same results were ob-tained by the writer with the distance twelve inches as when workingat twentv-four inches. Fig. 329. The lead glass bowl and X-ray tube must be removed while the centering rod isbeing used. When the stand is set, the rod is removed and the protection bowl and X-ray tube replaced. The first step is to centre the tube, to place it Setting so that a line (line F of Fig. 327) drawn from the tlibl Stand. focal point on the target will strike the plate in the center. This may be done with the greatest accuracy by the use of the centering rod (Fig. 326), but the use of the rod is not imperative unless a compression cone or cylinder (Fig. 328) is to be used, as will be described presently. After centering the tube, when using a stand like the one in and 330. the stand is set so that the tube may be moved one andone-quarter inch on each side of the center to positions I and J ofF]g- 327 (see illustration), DENTAL RADIOGRAPHY. Fig. 330. Pose for making Fig. 344, It is often expedient to have the patient remove the coat and collar for this pose. STRREOSCOPIC RADIOGRAPHY 35 ViaaiT
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