. Radiography, x-ray therapeutics and radium therapy . si-tions should sufiice to indicate the position of the foreign body. The cross-thread method of localisation should be employed as a confirmatory measure. Localisation of Foreig-n Bodies in the Skull. — The methods SIMPLE METHODS OF LOCALISATION 119 available are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not possible to haveaccess to the two methods referred to. It is one which anyone possessing anX-ray installation can carry out, and which has proved useful in m
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. Radiography, x-ray therapeutics and radium therapy . si-tions should sufiice to indicate the position of the foreign body. The cross-thread method of localisation should be employed as a confirmatory measure. Localisation of Foreig-n Bodies in the Skull. — The methods SIMPLE METHODS OF LOCALISATION 119 available are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not possible to haveaccess to the two methods referred to. It is one which anyone possessing anX-ray installation can carry out, and which has proved useful in manyinstances. Three plates are required : (1) Right lateral, (2) left lateral, (3)antero-posterior. For the localising of foreign bodies in the head the skullis divided into sections by means of flexible wire. A piece of wire is fixed inthe longitudinal diameter, extending from the nasion in front to the externaloccipital protuberance behind. A second wire is carried from the nasionthrough the centre of the external auditory meatus backwards to end. Fig. 97.—Bullet in brain. Fragments in face. below the occipital protuberance. A third wire is carried vertically overthe skull from one external 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 Foreig-n Bodies in Regrion 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 Foreig-n Bodies in the Limbs.—In a number ofinstances it may be possible to locate the foreign body by screening alone. 120 EADIOGRAPHY In oth