. Radiography, X-ray therapeutics and radium therapy . ; arrows indicateposition of wounds. Graduated scale over bone. Hori-zontal line indicates distance from edge of bone, obliqueline distance from upper arrow. in relation to a bony landmark, but for exact localisation it is necessary to use the cross thread method. It has been suggested that X-ray localisation in several cases has complicated the removal rather than been helpful. In order to obviate such complications the following method might be adopted. The foreign body should beaccurately located by the Davidsonmethod and stereoscopic p
. Radiography, X-ray therapeutics and radium therapy . ; arrows indicateposition of wounds. Graduated scale over bone. Hori-zontal line indicates distance from edge of bone, obliqueline distance from upper arrow. in relation to a bony landmark, but for exact localisation it is necessary to use the cross thread method. It has been suggested that X-ray localisation in several cases has complicated the removal rather than been helpful. In order to obviate such complications the following method might be adopted. The foreign body should beaccurately located by the Davidsonmethod and stereoscopic platestaken. The exact spot is markedout and the plates viewed in thestereoscope. These two give theexact spot where the body removal the following pro-cedure is suggested. In the operating theatre or theX-ray room a simple table is con-verted into a combined X-ray andoperating-table by using one of the simpler tube-stands which allows of a tube-carrier being placed under*the table, a second arm carrying the fluorescent screen. The latter has. FlG. 102.—Fragments of shrapnel in hand. 122 RADIOGEAPHY attached to it a small scale with moving points, such as the Hampson,or one made by Watson and Sons. The tube is accurately centred andthe distance between the anti-cathode and the screen ascertained. Thepatient is prepared for operation and placed on the table. The bodyis then located on the screen, the skin being marked by a smallincision at a point corresponding to the shadow. The foreign bodylies just under this spot. The depth is ascertained by a displace-ment of the tube afiklll known distance, the scale on the screenautomatically record-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
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