. X-ray observations for foreign bodies and their localisation . ross wires. With the patient so disposed, and tube andplate arranged, the first plate is exposed, and for the secondexposure the patient is directed to gaze to the side oppositeto that of the injured eye (adduction). Five plates have now 30 X-Ray Observations for Foreign Bodies been taken, and from the study of these the diagnosis will bemade. (Illustrations i6, 17.) The first step towards localisation is to make tracings fromthe radiographs—from each set one composite tracing ismade. From plate 0 the outHnes of the bony skeleton
. X-ray observations for foreign bodies and their localisation . ross wires. With the patient so disposed, and tube andplate arranged, the first plate is exposed, and for the secondexposure the patient is directed to gaze to the side oppositeto that of the injured eye (adduction). Five plates have now 30 X-Ray Observations for Foreign Bodies been taken, and from the study of these the diagnosis will bemade. (Illustrations i6, 17.) The first step towards localisation is to make tracings fromthe radiographs—from each set one composite tracing ismade. From plate 0 the outHnes of the bony skeleton ofthe orbit and of the metal wire are drawn on transparent foreign body is also traced; this should be done accu-rately, with attention to any orientation it may possess; thencarefully superimposing the tracings on the plates marked up and down, the other shadows of the foreign body are same procedure is followed in the production of theantero-posterior tracing. These tracings may be called• lateral and frontal. (Illustrations 18, 19.). Illustration Tracing. Illustration Tracing. It is possible that the shadows of the foreign body maycompletely overlie; they may overlie in one tracing and beneatly separated in the other; or they may be separated in both. A foreign body that has not moved in either is (ci) not inthe eye at all, or {b) in the centre of the eye; this latter possi-bility is important and must never be overlooked; it may meana tiny foreign body located in the vitreous humour, or adheringto the posterior surface of the crystalline lens. If the foreignbody is in the centre of the globe, its position in the lateraltracing will be slightly anterior to the shadow of the malarborder of the orbit, and near also to the shadow of the wirethat materialises the horizontal axis of the eye; and on the X-Ray Observations for Foreign Bodies 31 frontal tracing it will coincide, or nearly so, with the centre ofthe cross wires. This ques
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