. The American journal of roentgenology, radium therapy and nuclear medicine . ? In such cases we usually turn the in-jured member at an angle of 90° and hav-ing made sure that the line joining thepoint of incidence to the point of emer-gence is parallel to the table, w^e pass theincident normal ray successively throughthe projectile and through the marker,thus indicating on the screen the exactdepth of the projectile (see Figs. 8 and 9). XII. Anatomical Localization and Or-thodiagrams.—It will not be difficult inmany cases to draw exact conclusionsfrom the point of view of anatomical local-iz
. The American journal of roentgenology, radium therapy and nuclear medicine . ? In such cases we usually turn the in-jured member at an angle of 90° and hav-ing made sure that the line joining thepoint of incidence to the point of emer-gence is parallel to the table, w^e pass theincident normal ray successively throughthe projectile and through the marker,thus indicating on the screen the exactdepth of the projectile (see Figs. 8 and 9). XII. Anatomical Localization and Or-thodiagrams.—It will not be difficult inmany cases to draw exact conclusionsfrom the point of view of anatomical local-ization. We have said (see paragraph II)that other roentgen ray findings could betaken into consideration. In other cases (intra-articular projec-tiles) it is in the best interest of the sur-geon to have a document which will clearlyindicate to him the relation of the pro- jectile to the bones in the vicinity. Thisis of much more importance to him thana landmark on the skin. The document which we furnish is ananteroposterior and a lateral orthodiagram Repere. Fig. 8. in preference to a simple screen tracingwhich gives distorted shadows and whichmay falsify the record. It is sufficient totrace with an indelible pencil on the glassof the screen the incidence of the rayscoming out of a small diaphragm abovethe tube. This the assistant moves whilethe operator traces. XIII. The Uses of Roentgenography, ofthe Hirtz Compass, and of Extraction Under
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