. Radiography and radio-therapeutics . es in the Skull.—The methodsavailable are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not possible to have access to the two methods referred to. It is one which any one possessing an X-ray installation can carry out, and which has proved useful in many instances. Three plates are required: (1) Right lateral, (2) left lateral, (3) antero-posterior. For the localising of foreign bodies in the head the skull is divided into sections by means of flexible wire. A piece of wire is fixed
. Radiography and radio-therapeutics . es in the Skull.—The methodsavailable are (a) stereoscopic ; (6) stereoscopic combined with MackenzieDavidson method. A simple method may be employed when it is not possible to have access to the two methods referred to. It is one which any one possessing an X-ray installation can carry out, and which has proved useful in many instances. Three plates are required: (1) Right lateral, (2) left lateral, (3) antero-posterior. For the localising of foreign bodies in the head the skull is divided into sections by means of flexible wire. A piece of wire is fixed in the longitudinal diameter, extending from the nasion in front to the external occipital protuberance behind. A second wire is carried from the nasion through the centre of the external auditory meatus backwards to end below the occipital protuberance. A third wire is carried vertically over the skull from one external auditory meatus to the other. Three plates are taken and compared. When the foreign body is sharper on one plate. Fig. ]62rt. —Foreign bodies in the region of shoulder-joint. 188 RADIOGRAPHY than on the others it indicates that it is nearer to the side on which it issharpest. The antero-posterior plate confirms this observation. The lateral
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