. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ct examined has a length greater thanthe length of the pins used in this experiment, of course the error wouldbe greater. This experiment demonstrates that to get the best defini-tion and to prevent exaggeration in the size of the object that is to bephotographed, or observed on the fluorescent screen, the object mustbe near and the tube distant from the plate; and that the nearer thetube to the plate the more important is it that the object also
. The Roentgen rays in medicine and surgery as an aid in diagnosis and as a therapeutic agent : designed for the use of practitioners and students . ct examined has a length greater thanthe length of the pins used in this experiment, of course the error wouldbe greater. This experiment demonstrates that to get the best defini-tion and to prevent exaggeration in the size of the object that is to bephotographed, or observed on the fluorescent screen, the object mustbe near and the tube distant from the plate; and that the nearer thetube to the plate the more important is it that the object also be nearthe plate. Position of Tube and Screen or Plate. — The tube should be so placedthat the rays will fall as perpendicularly upon the screen or photographicplate as the given conditions will permit. The following diagrams, likethe cuts of the pins (see Figs. 51 and 52), direct attention to the effect METHODS OF EXAMINATION 65 on the picture of the position of the tube and plate with reference to thepart to be photographed, or examined with the fluorescent screen, andlikewise point out the importance of having the plate as nearly as pos-. FlG. 51. Cut of photograph showing relative position of the cork containing the pins, the photo-graphic plate, and the vacuum tube vvhen Fig. 52 was taken. sible at right angles to the direction of the rays (see Fig. 53). The target of the tube should be directly opposite the part to be examined. Method for securing a Constant Position for the Target in Relation to 66 THE ROENTGEN RAYS IN MEDICINE AND SURGERY the Patient. — This constant position is of primary importance, and ma)be obtained in the following way. Plumb-lines. — The stretcher support should be provided with twcplumb-lines, one hanging from either end of its median line ; or if the floo]of the room is uncarpeted a line may be drawn upon it parallel with thimedian line. The stretcher is narrow and sinks a little with the weighof the patient, so that it is easy to place hi
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