. Radiography and radio-therapeutics . t representedby dot F1 in Fig 152,. side view. Place another dot on point P on the same horizontal line, and draw through these two points projecting it into the front view as the position of the localiser ball B, as shown on the chart, is the-same as when the first picture was made, the location of the foreign bodymust be at point F1 in the side view. It is, however, still necessary to-establish its position to the nasal or temporal side of the eyeball. Project a line vertically through F1 to the 45° angle, and from thathorizontally th
. Radiography and radio-therapeutics . t representedby dot F1 in Fig 152,. side view. Place another dot on point P on the same horizontal line, and draw through these two points projecting it into the front view as the position of the localiser ball B, as shown on the chart, is the-same as when the first picture was made, the location of the foreign bodymust be at point F1 in the side view. It is, however, still necessary to-establish its position to the nasal or temporal side of the eyeball. Project a line vertically through F1 to the 45° angle, and from thathorizontally through the horizontal section. Upon the other half of negative (Fig. 151, 6), which represents the secondor oblique exposure, a line is drawn through the horizontal axis of both theball and cone, thereby projecting their supporting stems and establishingthe relative position of their horizontal planes to that of the foreign third line is drawn at right angles to the first two through the centreof the shadow of the foreign Fig. 152.—Explanatory diagram showing method of workingout localisation in eyeball. (A. E. Dean.) —•
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