. The American journal of roentgenology, radium therapy and nuclear medicine . iety in stration of the sphenoids and ethmoids by Many difficulties have been involved in vertical view; that is, in the demonstration this procedure. In the first place it is of the horizontal plane of these sinuses, necessary to cut the films to the exact so as to project them side bv side in hori- size and shape that will fit the average zontal section. Heretofore* it has been mouth and pharynx. I obtained this first necessary to either project the outlinesof these sinuses through the vertex of thesk
. The American journal of roentgenology, radium therapy and nuclear medicine . iety in stration of the sphenoids and ethmoids by Many difficulties have been involved in vertical view; that is, in the demonstration this procedure. In the first place it is of the horizontal plane of these sinuses, necessary to cut the films to the exact so as to project them side bv side in hori- size and shape that will fit the average zontal section. Heretofore* it has been mouth and pharynx. I obtained this first necessary to either project the outlinesof these sinuses through the vertex of theskull or downward within the submaxillaryspace and below the tissue of the either instance the position of thesinuses is so far away from the photo-graphic film that there is much distortionand great want of definite detail. With theobject of bringing the films nearer to thesphenoid and ethmoid cells to be photo-graphed I have devised a method ofplacing a special film in the mouth, pushingit backward firmly against the pharynx. bv finding a size that would best fit my. Fig. own moutfi and which I could hold in it DacKwara nrmiv against mc (ukujua. uv>n luvsuui a.^^. ,,*»».». - —---—- --This gives a definite level for the projection position comfortably when pushed entirelyof the outlines of these sinuses and elimi- against the posterior wall of the pharynx nates most of the irregular extraneousshadows of overlying bones. One has thenabove this film only the base of the skull,and in this small area one practicallyobtains only the outlines of the sphenoidsinuses and the ethmoid cells surroundedby a border of teeth in the upper jaw. This size is 2 in. by 3 in. It issquare at one end and curved at the endwhich is pushed against the pharynx. Ithen found great annoyance from thesecondary radiation of the tissues aboutthe mouth which caused a great deal oifog. This was partially overcome, even as oy a Doraer 01 xeein m mc uppu i. .^g,. **~ „„„„„,, ------
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