. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . e first line willcorrespond with plate H and the second line will have the positionof B in Fig. 195. Make a dot on B at C and another directly underC on H. Now make a dot on B 3 inches on either side of C andmark them G and E respectively. By referring to Fig. 195 it willbe seen that the points G and E represent the positions of the tubewhen the exposures were made. Take the plates as shown in , and with a pair of dividers c
. Practical electro-therapeutics and X-ray therapy : with chapters on phototherapy, X-ray in eye surgery, X-ray in dentistry, and medico-legal aspect of the X-ray . e first line willcorrespond with plate H and the second line will have the positionof B in Fig. 195. Make a dot on B at C and another directly underC on H. Now make a dot on B 3 inches on either side of C andmark them G and E respectively. By referring to Fig. 195 it willbe seen that the points G and E represent the positions of the tubewhen the exposures were made. Take the plates as shown in , and with a pair of dividers carefully measure the distance be-tween the shadow of the bullet and the shadow of the central wireon m, and make a dot the same distance to the left of the dot on the same with plate n, and place a dot to the right on line H. 378 PRACTICAL ELECTRO-THERAPEUTICS AND X-RAY THERAPY Now carefully draw a line from G to the dot on the right and an-other from E to the dot on the left. The point where the two linescross will be the location of the bullet above the plate H. In thiscase the bullet was exactly 3 inches above the plate when the ex-posures were Fig. 197.—Method of making exposures for locating foreign bodies in the tissues. Cal-culating the location of the foreign body. If the skiagraphs and drawing are accurately made, there is littlepossibility for error—not more than 5 percent. It should be re-membered that at the time of making the exposures the tube mustbe turned toward the object skiagraphed, so that the direct rays maypass through it to the plate. A little practice will enable the op-erator with a good equipment to locate a bullet or other foreignbody with so great a degree of accuracy that the surgeon will havevery little difficulty in removing it. CHAPTEE XIX. X-RAY IN GALL-BLADDER STONES AND KIDNEY STONES. Perhaps no other symptoms are more difficult of diagnosis thanthose that frequently occur in the gall-bladder, kidneys, and ure-ters. Operations
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