. A text-book of radiology . , spread out andpractically lost, so that we get a radiograph of one sideonly. In a good lateral view most of the important points ofthe skull can be made out, but to ensure success the properrelation of tube, head and plate must be secured andfixation must be perfect. The sella turcica can be shown by passing the normalray one inch in front and one-half inch above the externalauditory meatus. It is sometimes required in suspecteddisease of the pituitary gland. (See Fig. 51.) An antero-posterior view is sometimes useful. Thepatient lies prone with the face pressed
. A text-book of radiology . , spread out andpractically lost, so that we get a radiograph of one sideonly. In a good lateral view most of the important points ofthe skull can be made out, but to ensure success the properrelation of tube, head and plate must be secured andfixation must be perfect. The sella turcica can be shown by passing the normalray one inch in front and one-half inch above the externalauditory meatus. It is sometimes required in suspecteddisease of the pituitary gland. (See Fig. 51.) An antero-posterior view is sometimes useful. Thepatient lies prone with the face pressed against the plate. The normal ray should traverse a line drawn from apoint midway between the external occipital pro-tuberance and the vertex, to the orbit. This view is useful in disease of the frontal sinuses andantrum. THE HEAD. 137 The Face.—In a lateral view the normal ray shouldpass jnst below the zygomatic arch. An antero-posterior view is best obtained with the platein front, and the normal ray passing through from. Fig. 51. From Case of Acromegaly. Cavity of Sella Turcica enlarged from absorption of posterior clinoidprocesses. behind, at a point just above the external occipitalprotuberance. The Lower Jaw. — Lateral view — the normal raypasses through the last molar tooth, or we may bring the 138 TEXT-BOOK OF RADIOLOGY. tube nearer the patients shoulder so that the ray passesin under the side which is uppermost. It is necessary to
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