. Elementary and dental radiography . xn-3 Fig. 327. A and AA, lead which protects the plate against the action of the X-ray. B, windowof thin aluminum or celluloid on which the part being radiographed lies. C, end of the , plate carrier. E, end of 5x7 plate on which the first radiograph is made with the tube inposition I. EE, end of plate on which second radiograph is made after it is shifted underthe window B, and the tube is in position J. F, centering line. G, angle of X-rays with the tube in the first position. I. H, angle of X-rays with the tube in second position, J. The diagram
. Elementary and dental radiography . xn-3 Fig. 327. A and AA, lead which protects the plate against the action of the X-ray. B, windowof thin aluminum or celluloid on which the part being radiographed lies. C, end of the , plate carrier. E, end of 5x7 plate on which the first radiograph is made with the tube inposition I. EE, end of plate on which second radiograph is made after it is shifted underthe window B, and the tube is in position J. F, centering line. G, angle of X-rays with the tube in the first position. I. H, angle of X-rays with the tube in second position, J. The diagram shows the tube being shifted on a line with its long axis. It may be shifted in this manner, or at any angle to its long axis—it makes no Fig. 328. Compression cones, cylinder and square. 302 DENTAL RADIOGRAPHY tecbnic for makins Stereoradiography. Let us now take a concrete example and describe and discuss thesteps taken in the making of Fig. 339. First, what should be the distance between theDistance. target and the plate? There are no special rules to follow regulating the distance between the target andthe plate when making stereoradiographs. The same results were ob-tained by the writer with the distance twelve inches as when workingat twenty-four inches. Fig. 329. The lead glass bowl and X-ray tube must be removed while the centering rod isjeing 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 tube 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 th
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