. Radiography and radio-therapeutics . h the cross-thread localiser of MackenzieDavidson for the exact local-isation of the foreign body bymeasurements made from theplates. In order to do thisit is necessary to place uponthe plate cross wires which will make an impression upon the skin of thepatient, and this can be at once rendered more or less permanent by 1 2 1 and 2, Shadows of foreign body. 156 KADIOGRAPHY marking in copying ink, or a preparation of aniline, gentian violet, or silvernitrate may be used. The cross wires make a permanent record upon tliephotographic plates. The two negative
. Radiography and radio-therapeutics . h the cross-thread localiser of MackenzieDavidson for the exact local-isation of the foreign body bymeasurements made from theplates. In order to do thisit is necessary to place uponthe plate cross wires which will make an impression upon the skin of thepatient, and this can be at once rendered more or less permanent by 1 2 1 and 2, Shadows of foreign body. 156 KADIOGRAPHY marking in copying ink, or a preparation of aniline, gentian violet, or silvernitrate may be used. The cross wires make a permanent record upon tliephotographic plates. The two negatives are superimposed so that the impression of crosswires on the one is exactly in position over the impression on theother. The picture now shown consists of (a) cross wires, (b) object onplate, (c) foreign body. There are now two shadows of the foreign body seen on the picture ;the distance between the two is an indication of the change induced bymoving the X-ray tube. The method of production can best be explained by a diagram. Plate. Tube -Foreign BodyObject Plate
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Keywords: ., bookcentury1900, bookdecade1910, bookidradiographyr, bookyear1919
