. Radiography and radio-therapeutics . e ofthe screen which has beenremoved. The guide per-mits of the movement of .the director only in the direction corresponding to the central the director is advanced through the tissues, its point will impinge against the foreign body. r , i ji j The guide and director being sterilisable, they can be safely handledduring the operation. A joint is provided in the cross arm to allow of thedirector being lifted out of the way when not required. The X-ray observer, when he completes his examination, removes thefluorescent screen; an assistant now
. Radiography and radio-therapeutics . e ofthe screen which has beenremoved. The guide per-mits of the movement of .the director only in the direction corresponding to the central the director is advanced through the tissues, its point will impinge against the foreign body. r , i ji j The guide and director being sterilisable, they can be safely handledduring the operation. A joint is provided in the cross arm to allow of thedirector being lifted out of the way when not required. The X-ray observer, when he completes his examination, removes thefluorescent screen; an assistant now places in position, under strictlyaseptic conditions, the guide and director, and the surgeon is m a positionto proceed with the operation ; by following the line of the director he shouldreadily find the foreign body. j v i. This is undoubtedly a most valuable mechanism and already it Hasproved its value in a number of cases. Great care must, however, be exer-cised in order that all parts of the apparatus are accurately adjusted. It. Fig. 147.—Cross arm showing metal guide and director.(From The Archives of Radiology and Electrotherapy.)S, Sharp director. F, guide. The cross arm C can be raised by movement of the joint H,which is constructed so that the arm is capable of returning tothe same position readily and accurately. The joint fronto Y can be sterilised. X 174 KADIOGRAPHY this is not done the wrong line of approaching the foreign body may befollowed and failure result. Small bodies, such as pieces of needle, mayeasily be missed, even with this instrument. The next step in ourendeavour to assist the surgeon brings us to the ideal method. The Combined Method.—This entails the use of the operating theatre,which must be rendered light-proof. For the purpose of rendering the retina}of the operator sensitive to the appearance in the fluorescent screen whitelight must be aboKshed. Ruby light is quite strong enough for the ordinaryoperations if there is enoug
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