. Radiography and radio-therapeutics . tof \iew we take. In the first position de-scribed, the observer is lookingtowards the tube through thefilm on which the impression of Fk;. 126.—Radiogram of same sliouMer as in , taken with plate in tlie axilla, and tlie tubecentred above the joint. This shows a fracture of the upper shaft of thehumerus, and a ride bullet in relation to the bodj-of the scapula and the acromion process. glass of the negative, then through thethe body is made ; inthe stereoscope thisgives the form of thebony structures of thebody in rehef. Theactual structures com-p
. Radiography and radio-therapeutics . tof \iew we take. In the first position de-scribed, the observer is lookingtowards the tube through thefilm on which the impression of Fk;. 126.—Radiogram of same sliouMer as in , taken with plate in tlie axilla, and tlie tubecentred above the joint. This shows a fracture of the upper shaft of thehumerus, and a ride bullet in relation to the bodj-of the scapula and the acromion process. glass of the negative, then through thethe body is made ; inthe stereoscope thisgives the form of thebony structures of thebody in rehef. Theactual structures com-posing the picture aremade up of layers oftissue and skin, muscle,bone, muscle, bone,then contents of thethorax, and again bone,muscle, skin ; the ob-jects nearest to theplate are sharp in out-line, those furtherremoved throw acorresponding largeiand less sharp outline. T- • , Fi(f.]27.—Radiogram of .same shoulder as above, taken with the plate It IS easy now to see behind the shoulder and the tube in front. Showing rilie EXAMINATION OF STEREOSCOPIC NEGATIVES 155 the correct relative positions of the parts; in position two the observersnow ooking at the object from the point at which the tube .s situated,consegnently L structures nearer to the observer, in this part,c_ular instanceh aTeriorribs. are in rehef. the posterior portions o t^c r^s are nea-than the foreign body; they therefore appear in front of the bullet, thenleb^ 1 it i tescapula and if cross wires have been used they also appearb Mnd all the structures. It is customary in some cases to place a knownbodv i e. a piece of lead or a metal figure, on a pomt of the skin (for con-vemW the entrance wound is utilised if it is anywhere near the bullet)the shadow thrown by the known body is useful as a guide and may subse-ouently b used for measurements. This plan is followed m the locahsationTforllgn bodies in the orbit or eyeball when using Mackenzie Davidson scross-thread locahsation method. The stereoscopic
Size: 1594px × 1568px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookauthorknoxrobert18681928, bookcentury1900, bookdecade1910
