. Radiography, X-ray therapeutics and radium therapy . PlG. 106.—Position for radiography of the mastoidsinuses. (Pirie.). PLATE [I.—Normal Skulls. «, Skull of child, plate on anterior aspect showing nasal fossae ; teeth well shown ; there are severalunerupted teeth seen. b, Mid area of skull ; a line has Wen placed on points giving the radiographic base-line ; the lineruns through the base of the sella turcica (dry skull). c, Lateral view of skull in living subject ; probes have been placed in the frontal and sphenoidal sinuses. RADIOGRAPHY OF THE FRONTAL SINUSES 127 shaped line. This crescen
. Radiography, X-ray therapeutics and radium therapy . PlG. 106.—Position for radiography of the mastoidsinuses. (Pirie.). PLATE [I.—Normal Skulls. «, Skull of child, plate on anterior aspect showing nasal fossae ; teeth well shown ; there are severalunerupted teeth seen. b, Mid area of skull ; a line has Wen placed on points giving the radiographic base-line ; the lineruns through the base of the sella turcica (dry skull). c, Lateral view of skull in living subject ; probes have been placed in the frontal and sphenoidal sinuses. 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. Finzi. 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 direct
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