. The American journal of roentgenology, radium therapy and nuclear medicine . nd theMackenzie Davidson Localizer is alwayskept ready fixed up at this distance, so LOCALIZATION TABLE Tube Distance—18 inches 45 cms.) Tube Shift—6 cms. Shadow Depth of Shadow- Depth of Shadow Depth of _ Shift Shift Shift in mm. inches in mm. inches in mm. inches I 21 41 730 2 22 42 7 41 3 23 4-99 43 7 51 4 24 514 44 7 61 5 25 529 45 7 71 6 26 5-44 46 7 81 7 27 47 7 90 8 28 5-73 48 8 GO 9 29 49 8 09 lO 30 50 8 18 II 2.
. The American journal of roentgenology, radium therapy and nuclear medicine . nd theMackenzie Davidson Localizer is alwayskept ready fixed up at this distance, so LOCALIZATION TABLE Tube Distance—18 inches 45 cms.) Tube Shift—6 cms. Shadow Depth of Shadow- Depth of Shadow Depth of _ Shift Shift Shift in mm. inches in mm. inches in mm. inches I 21 41 730 2 22 42 7 41 3 23 4-99 43 7 51 4 24 514 44 7 61 5 25 529 45 7 71 6 26 5-44 46 7 81 7 27 47 7 90 8 28 5-73 48 8 GO 9 29 49 8 09 lO 30 50 8 18 II 31 51 8 27 12 32 52 8 36 13 33 53 8 44 U 3 40 34 54 8 53 15 35 55 8 62 i6 3-79 36 56 8 70 17 3-97 37 57 8 77 i8 415 38 58 8 85 19 4-33 39 59 8 92 20 4 50 40 60 9 00 that fresh measurements do not have tobe made on each occasion the localizer isrequired. The tube is centred over thechanging-box and marks on the floor indi-cate exactly where the tube-stand shouldbe placed, so that the central rays impinge. Fig. 2. Piece of High-Explosive Shell ix Abdom-inal Wall. One of a pair of stereoscopic pictures showing theuse of metal rings in increasing stereoscopic marked A and B were placed on the C and D were on the plate which was placed be-neath the patient, on the same plane as the cross wires. Upon the exact position where the wirescross. As a matter of fact, granting that theanticathode is always fixed at a knowndistance from the photographic plate, atable can be constructed showing the depthof the foreign body from the surface whenthe shadow-shift is known. The accompany-ing table is constructed for a tube distanceof 18 (45 centimetres) and a tube shift of6 cms. In all probability this table hasbeen previously published in your Journal,but I insert it here again as it may proveuseful to those engaged in war roentgenol- 284 Roentgenolog}^ in Warfare ogy. A table from any tube distanc
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