. Radiography and radio-therapeutics . be inserted between the tube and the obtained in this way will be found to give much finer detail thanthose taken with a wide diaphragm. It is important to note that in radio-graphs of the skull as much detail as can be obtained is desirable. (3) The Examination of the Frontal Air Sinuses.—Two methodsmay be employed: (a) alateral view of the skull,showing the air sinuses inprofile ; (6) antero-posterior,the plate on the front of theskull and the tube direct antero - posteriorview does not show thesinuses at all well, theoverlappi
. Radiography and radio-therapeutics . be inserted between the tube and the obtained in this way will be found to give much finer detail thanthose taken with a wide diaphragm. It is important to note that in radio-graphs of the skull as much detail as can be obtained is desirable. (3) The Examination of the Frontal Air Sinuses.—Two methodsmay be employed: (a) alateral view of the skull,showing the air sinuses inprofile ; (6) antero-posterior,the plate on the front of theskull and the tube direct antero - posteriorview does not show thesinuses at all well, theoverlapping of the shadowcaused by the occipital andtemporal bones obscuringthe detail in the frontaland accessory are two routes bywhich the rays may bepassed through the back ofthe skull. (1) The tubemay be centred below thebony mass formed by theoccipital protuberance : therays still have to traversethe thick parts of the baseof the skull. (2) A bettermethod is to place thepatient face downwards onthe photographic plate, the. Fig. 174.—ArrangciiKiit l ai)iiara!U:the orbit and accessory sinuses,changing stereoscopic movement. ; for railiiLTapliy ofFitted with quick-(F. Butt & Co.) latter being placed at an angle of 25 degrees. The tube is centred well in 206 RADIOGRAPHY front of the occipital protuberance, and an oblique though somewhatdistorted view is obtained which shows the frontal air sinuses Plates showing frontal air sinuses, taken by this method, illustrate thepoints to be examined. (4) The Sphenoidal Sinus.—The lateral position gives an indicationof the extent of the sphenoidal sinus so far as depth is concerned, but it isimpossible to judge the size of the right or left side from such a plates will, however, aid greatly in estimating the size andextent of the sphenoidal sinus. The postero-anterior projection affords
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