. Radiography and radio-therapeutics . owing procedure is followed. The T-shaped piece of the localiser (see Fig. 130) is adjusted tocorrespond to the distance between the anti-cathode of the tube and theX-ray plate; for convenience in general work a distance of 50 centimetresis chosen and a predetermined displacement of the tube used. This isthe method adopted by Hampson and others for the rapid localisation ofa foreign body. The cross threads are arranged on needle points and the followingmeasurements made : A corresponding point on the two shadows is selected,the needle points are placed on
. Radiography and radio-therapeutics . owing procedure is followed. The T-shaped piece of the localiser (see Fig. 130) is adjusted tocorrespond to the distance between the anti-cathode of the tube and theX-ray plate; for convenience in general work a distance of 50 centimetresis chosen and a predetermined displacement of the tube used. This isthe method adopted by Hampson and others for the rapid localisation ofa foreign body. The cross threads are arranged on needle points and the followingmeasurements made : A corresponding point on the two shadows is selected,the needle points are placed on these so that the threads cross in space(the threads then represent the path of the centred rays in the two positions EXAMINATION OF STEREOSCOPIC NEGATIVES 157 of the tube)—the point of intersection is taken and the distance from it to the surface of the plate is measured. The markson the skin corresponding to the cross wires onthe plates are utilised for the purpose of indicatingthe exact position of the foreign body. Foreign Bodi.
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