. Radiography and radio-therapeutics . is impossible to recordupon a plate. But radiographs which are taken instantaneously are ofgreat value as confirmatory evidence of changes in the organs, and shouldalways be taken to complete the examination. The importance of havinga thoroughly reliable fluorescentscreen must be borne in is also essential that the screenbe smooth on the surface, andkept scrupulously clean. Thelead glass protection should alsobe kept well polished, for even atrace of dirt or pencil mark on itssurface may lead to trouble, theimportance of this point beingreadily un
. Radiography and radio-therapeutics . is impossible to recordupon a plate. But radiographs which are taken instantaneously are ofgreat value as confirmatory evidence of changes in the organs, and shouldalways be taken to complete the examination. The importance of havinga thoroughly reliable fluorescentscreen must be borne in is also essential that the screenbe smooth on the surface, andkept scrupulously clean. Thelead glass protection should alsobe kept well polished, for even atrace of dirt or pencil mark on itssurface may lead to trouble, theimportance of this point beingreadily understood where finedetail is being dealt with. It is also of importance tohave the patient perfectly still,especially when radiography isemployed, since the slightestmovement during the exposuremay ruin the value of a plate. The screening stand should be connectedto earth by a wire, in order to avoid giving the patient a shock fromthe electrical discharges which are given off from the tube and metal fittingswhen the former gets Fig. 247.—Normal lower cervical and upper dorsalvertebrffi. The apical part of both lungs isalso well shown. Radiography In radiography of the lungs for diagnostic purposes it is necessary touse a soft tube in order to obtain the best results. It is detail in lungs andnot in bone that we look for. A soft tube of about 3-4 inch spark-gap willallow a large quantity of current to pass through it, and will give very gooddetail in the soft parts. Time exposures of any length are of no great value for diagnosis ; ifwe are to get plates which will to any extent reproduce what we have seenon the screen, the exposure must be exceedingly short; in fact, the shortestobtainable is the best. With a powerful modern installation the exposure 284 KADIOGRAPHY may be cut down to tfo of ^ second. The resulting picture is of great value,because everything is absolutely sharp, the heart being represented inoutline by the sharpest possible line. The diaphragm is also
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