. Radiography, x-ray therapeutics and radium therapy . fthe cells. 6. The foramen magnum, appear-ing as an elliptical opening with part of the first vertebra crossing it. 7. The outline of the pinna of the inastoiditis shows the following departures from the above description : 1. The air cells are obscured, but can still be faintly seen. 2. The outline of the lateral sinus may be a little more defined than normally. 3. The petrous bone is denser. 4. The whole mastoid region is denser. When one gets an absolutely normal mastoid on one side, and the otherside presents the appearance j
. Radiography, x-ray therapeutics and radium therapy . fthe cells. 6. The foramen magnum, appear-ing as an elliptical opening with part of the first vertebra crossing it. 7. The outline of the pinna of the inastoiditis shows the following departures from the above description : 1. The air cells are obscured, but can still be faintly seen. 2. The outline of the lateral sinus may be a little more defined than normally. 3. The petrous bone is denser. 4. The whole mastoid region is denser. When one gets an absolutely normal mastoid on one side, and the otherside presents the appearance just described, together with certain clinical signsand symptoms, one is justified in diagnosing acute mastoiditis. Chronic mastoiditis is very t\-pical in a skiagraph. It presents the followingdepartures from the normal: 1. The air cells are completely absent. 2. The petrous bone stands out as a very dense, roughly triangular area,with its apex pointing upwards and backwards. 3. The posterior border of the petrous bone forms part of a sharp crescent-. Fiu. 106.—Position lor ladiograpliy of the mastoidsinuses. (Pirie.) RADIOGRAPHY OF THE FRONTAL SINUSES 127 shaped line. This crescent-shaped line corresponds with the upper and anteriorborder of the lateral sinus. 4. The lateral sinus is frequently very well shown. (1) Radiography of the Sella Turcica.—A useful method for theradiography of the sella turcica has been described by Dr. Fiiizi. Thepatient is placed upon the couch and the tube centred from below. To deter-mine the exact position two small coins are placed one in each ear. Afterthese are superimposed under the screen, the tube is then moved upwards andforwards 1 inch in each direction, and the radiograph taken. A perfectpicture of required should be obtained. AMien radiographing particular areas of the skull, the diaphragm shouldbe shut down to the smallest possible size, or if the tube is used overhead asmall extension tube should be inserted between the t
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