. Radiography and radio-therapeutics . ve ; simi-larly the condition of the tube and length of exposure should be the samefor each plate. A note should be made of the position of the plate in relationto the body of the patient. This will be found useful when it is necessary to 159 160 RADIOGRAPHY state the exact position of the foreign body in relation to fixed anatomicallandmarks. Simple Methods of Localisation.—There are simpler methods forlocalisation which may be employed in cases which are not likely to requirean exact degree of measurement. Foreign bodies in the limbs come underthis head
. Radiography and radio-therapeutics . ve ; simi-larly the condition of the tube and length of exposure should be the samefor each plate. A note should be made of the position of the plate in relationto the body of the patient. This will be found useful when it is necessary to 159 160 RADIOGRAPHY state the exact position of the foreign body in relation to fixed anatomicallandmarks. Simple Methods of Localisation.—There are simpler methods forlocalisation which may be employed in cases which are not likely to requirean exact degree of measurement. Foreign bodies in the limbs come underthis heading. It is obvious that in some instances one negative issufficient to indicate the position of the foreign body, though it is surprisinghow difficult an apparently easy case may become under some operations for removal should be undertaken as soon as possible afterthe radiograph. Difficult cases require more elaboration, and in all in-stances of bodies in the limbs two radiographs should be taken : (1) antero- *G0. I Fig. 131.—Diagram to show method of taking a lateral , Source of X-rays. E, Shadow of foreign body on plate. D, Foreign , , Limb. F, Shadow of bones. G, Graduated scale. posterior position, (2) lateral position. The limb need not be moved whenthese exposures are made. A simple plate-holder with a second one atright angles will suffice. The tube alone requires to be moved. An examina-tion of the two negatives should give the position of the foreign body. Inthe plate taken in position (1), the distance from a given point, probablya bony landmark, is taken. The plate taken in position (2) shows the depthfrom the surface. In most instances this should be sufficient, as the operatorhas only to measure the distance and make a mental note of the order to get a graphic record of the measurements, a simple plate-holder can be constructed with an inch or centimetre rule, which slides overthe surface of the plate so that i
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