. Radiography, X-ray therapeutics and radium therapy . l auditory meatus to the other. Three platesare taken and compared. When the foreign body is sharper on one platethan on the others it indicates that it is nearer to the side on which it issharpest. The antero-posterior plate confirms this observation. The lateralpictures also serve to show the relationship of the foreign body to a well-known landmark at the base of the skull. Localisation of Foreign Bodies in Reg-ion of Hip and Shoulder.—In these regions it is impossible to get more than one position, so stereo-scopic radiographs should b
. Radiography, X-ray therapeutics and radium therapy . l auditory meatus to the other. Three platesare taken and compared. When the foreign body is sharper on one platethan on the others it indicates that it is nearer to the side on which it issharpest. The antero-posterior plate confirms this observation. The lateralpictures also serve to show the relationship of the foreign body to a well-known landmark at the base of the skull. Localisation of Foreign Bodies in Reg-ion of Hip and Shoulder.—In these regions it is impossible to get more than one position, so stereo-scopic radiographs should be taken. These combined with the MackenzieDavidson method give the most accurate results. Localisation of Foreign Bodies in the Limbs.—In a, number ofinstances it may be possible to locate the foreign body by screening alone. 120 RADIOGRAPHY In other instances one of the methods described by Mackenzie Davidson,Hampson, Shenton, and others may be used. The position of the foreignbody is ascertained and a mark placed on the skin surface immediately. Fig. 98.—Fracture of lower jaw ; foreign body in soft parts ;a portion of shrapnel above the jaw bone. over it. The tube is then moved and the second position of the foreignbody noted. It is then a matter of calculation to estimate the depth ofthe foreign body. Hampson does so by means of the graduated scale, Shenton by the use of the probewith a bulging point on it, andby placing the limb at rightangles to the position it occu-pied when the mark was placedover the foreign body. Localisation of Foreign Bodies in Deep Parts of the Body. — In several of these regions the localisation of a foreign body is a matter of extreme difficulty, notably in the thorax abdomen, pelvis, axilla and region of the hip. The exact position may be marked out both stereoscopi- cally and by the Mackenzie Davidson method, and yet the necessity of t avoiding anatomical structures may render the subsequent removal difficult. In some cases it may be hel
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