. The principles and practice of roentgenological technique . s examination are in stereoscopy. Only in this, theplate method, two plates are made, each froma different tube position, the focal point beingdisplaced two and one-half inches ( cm.). For its successful practise there is neces-sary : 1. The maintenance of the undisturbed re-lationship between the immobilized part andthe plate. 2. The shifting of the tube, the proper dis-tance and direction. 3. The proper view of the examination may be made horizontally or vertically. Tlie shifting of the plate andtube
. The principles and practice of roentgenological technique . s examination are in stereoscopy. Only in this, theplate method, two plates are made, each froma different tube position, the focal point beingdisplaced two and one-half inches ( cm.). For its successful practise there is neces-sary : 1. The maintenance of the undisturbed re-lationship between the immobilized part andthe plate. 2. The shifting of the tube, the proper dis-tance and direction. 3. The proper view of the examination may be made horizontally or vertically. Tlie shifting of the plate andtube is now done automatically liy many de-vices. The tube is shifted at right angles to ri311 132 TELEOGRAPHY the long axis of the object through which itis desired to look. A certain var_ving degreeof tilting becomes necessary if a cone orcylinder is used. Both kidneys may be examined stereo-scopically on one set of plates and compressionstill maintained by a device suggested byCaldwell and described by Stewart, whichconsists of a small modern frame having the. Fig. 175.—Compression frame for exposures ofAbdomen. width of the space between the horizontal armsof the stand on which the tube holder slides.(Fig. 175). The length is sufficient to allow for the shift-ing of the tube and to give firm support while•compressing the abdomen about 14 \cross each end of the frame a wooden bar^ of an inch thick, and the same width as theend of the frame is provided; it extendsout over the frame on each side sufficientlyto receive the arms of the stand in hollowedends. At each terminal of this bar is placeda metal clip which snaps over the horizontal arms of the tube stand and holds the framein position. This frame is then windowedwith transparent celluloid Is of an inch The frame is snapped into place on thearms of the stand, an ordinary No. B rubberfootball bladder, encased in a canvas bag, isinflated and, placed on the abdomen of thepatient, beneath the celluloid frame. A
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectradiogr, bookyear1920
