. Radiography, X-ray therapeutics and radium therapy . ecord-ing the depth in cen-timetres. This read-ing should be com-pared with the resultobtained by the Mac-kenzie Davidsonmethod, and if theycorrespond the sur-geon has an accuratestatement of thedepth of the foreignbody. If owing tothe anatomical struc-tures interposed onthe line of the bodyit is not possible tocut straight downinto it, it can innearly every case befound by probing. Should the surgeon fail to find the body quickly,aimless probing should not be continued. The light of the room should beexcluded, the X-ray tube turned on, an
. Radiography, X-ray therapeutics and radium therapy . ecord-ing the depth in cen-timetres. This read-ing should be com-pared with the resultobtained by the Mac-kenzie Davidsonmethod, and if theycorrespond the sur-geon has an accuratestatement of thedepth of the foreignbody. If owing tothe anatomical struc-tures interposed onthe line of the bodyit is not possible tocut straight downinto it, it can innearly every case befound by probing. Should the surgeon fail to find the body quickly,aimless probing should not be continued. The light of the room should beexcluded, the X-ray tube turned on, and the surgeon will at once be ableto see how far his instrument is from the foreign body and guide hisforceps to it. The length of time the operator is exposed to the rays need not be morethan a few seconds, but if many cases daily require to be screened, somemethod of protection must be employed. By cutting down the diaphragmso that only a small pencil of rays emerge and using long-handled instrumentsthere should be very little risk to the PlG. 103.—Arrangement of X-ray tube and fluorescent screen foraccurate localisation by screen or plate. RADIOGRAPHY OF THE NORMAL BONES AND JOINTS A thorough acquaintance with the normal appearance of these parts isnecessary on the part of the radiographer before he proceeds to an interpreta-tion of the many variations which he may be called upon to describe. Notonly must he know the chief bones and joints from any one aspect, but heshould by a careful study of the parts know them from any point of may not be always possible to get the patient into the position of ease whichis generally the one in which the parts can be radiographed most patient suffering from an injury to a joint may not always be able to takeup a position on the X-ray table which will enable the operator to radio-graph the part to the best advantage; the apparatus may have to be adaptedto the patient instead of the patient to the apparatus, h
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