. Radiography and radio-therapeutics . | inches above the external auditory meatus, and passestowards the centre of the orbit. If the position is correctly estimated the optic foramen will occupy thecentre of the orbit, and to the outer side will be seen the sphenoidal fissure. RADIOGRAPHY OF THE ACCESSORY AIR SINUSES 207 Towards the median line is projected the sphenoidal sinus, anterior to theoptic foramen ; above this will be seen the upper brim of the orbit andabove the orbit the frontal sinuses. In radiography of the skull there are various positions which are usefulfor the production of
. Radiography and radio-therapeutics . | inches above the external auditory meatus, and passestowards the centre of the orbit. If the position is correctly estimated the optic foramen will occupy thecentre of the orbit, and to the outer side will be seen the sphenoidal fissure. RADIOGRAPHY OF THE ACCESSORY AIR SINUSES 207 Towards the median line is projected the sphenoidal sinus, anterior to theoptic foramen ; above this will be seen the upper brim of the orbit andabove the orbit the frontal sinuses. In radiography of the skull there are various positions which are usefulfor the production of radiograms of value in diagnosis. Screen methods areuseful in two directions, (1) for the selection of the best position in whichto secure the most useful picture of the skull, (2) for diagnosis—directdiacrnosis by the screen method is not generally used though it may at timesbe extremely useful. Of the radiographic methods advocated there are several good techniqueswhich are valuable. Some require most elaborate instrumentation and. Left fronWSinus _ . _ -I Crista ^o-lli Ethmoid cellExternal angularprocessofftDntilboni! -- ^Fronto-ma-la-rArticulation y Ethmoid cells Mal&r bone Floor of orbit Ms*illiry Antrum Maxillary antrum Floor of Nose Fig. 176.—Diagram illustrating the auatoraical lamliuarks iu Fig. ITo. produce uniformly good results ; others are simpler and most useful forordinary work. Whichever is employed it should be the endeavour of alloperators to approximate to a standard in position so that results may becomparable. Finzi and Hett advocate the supine position on the X-raytable, and make use of the screen for finding the best position. Martin Berry has exhaustively dealt with the positions for sums work,and has indicated what are in his opinion the best positions. He has intro-duced a chair fitted with mechanical adjustments which enable the operatorto repeat the exact position at a subsequent exposure (see pp. 197 and 202).This is an important step toward
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