. Radiography and radio-therapeutics . Tube. I / I I Foreign Body— Object Plate ^ (^ X-Ray Couch Tube \IUL Fig. 128.—Projection of rays upon a platewith tlie tube above the patient. Fig. 129.—Projection of rays upon a platewith the tube beneath the patient. Showing the change in position with a given movement of the tube. The direct vertical position is also shown in this diagram. To calculate the depth of the foreign body from the surface of thepatients skin near to the plate the following procedure is followed. The T-shaped piece of the locahser (see Fig. 130) is adjusted tocorrespond to the
. Radiography and radio-therapeutics . Tube. I / I I Foreign Body— Object Plate ^ (^ X-Ray Couch Tube \IUL Fig. 128.—Projection of rays upon a platewith tlie tube above the patient. Fig. 129.—Projection of rays upon a platewith the tube beneath the patient. Showing the change in position with a given movement of the tube. The direct vertical position is also shown in this diagram. To calculate the depth of the foreign body from the surface of thepatients skin near to the plate the following procedure is followed. The T-shaped piece of the locahser (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 locahsation 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 a
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