. Radiography and radio-therapeutics . round its edges, which serves as a protection for the operator. The screen iscovered by a piece of leadglass and in the centre of thisis a small hole. The hole isaccurately centred over theshadow of the foreign body,and the skin is marked by inkor an indelible lead pencil;this marks the first positionof the shadow. The tube ismoved 10 cm. in one direction,and a graduated scale fittedto the screen gives the depth of the foreign body, which is calculated bythe distance between the shadows. For the rapid localisation of a foreign body Herneman Johnson advoca
. Radiography and radio-therapeutics . round its edges, which serves as a protection for the operator. The screen iscovered by a piece of leadglass and in the centre of thisis a small hole. The hole isaccurately centred over theshadow of the foreign body,and the skin is marked by inkor an indelible lead pencil;this marks the first positionof the shadow. The tube ismoved 10 cm. in one direction,and a graduated scale fittedto the screen gives the depth of the foreign body, which is calculated bythe distance between the shadows. For the rapid localisation of a foreign body Herneman Johnson advocatesa ring localiser. He uses a metal ring attached to a long flat woodenhandle ; the long handle ensures the operator a measure of protection bykeeping his hands well out of the range of the X-rays. The patient isscreened (the tube being beneath the table, the screen above the patient),the ring is slipped under the screen, the bullet shadow is centred in the ring,and an automatic skin marker attached to the ring marks the point on the. Fig. 139.—Localising screen. (Thurstan Holland.)
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