. Radiographie, Röntgentherapeutika und Radiumtherapie . Schädel. A, laterale Ansicht des norma] Schädels, mit frontalen Sinus, Sphenoidalen Sinus, sella turcica, Schläfenknochen, Halswirbeln und Unterkiefer. /-, A.ntero-posteriore Ansicht i adulter Schädel, mit frontalen Nasennebenhöhlen, Orbits, nasal l»^sr, anna. Etc. Frontalsinus auf der linken Seite ist undurchsichtig. c, laterale Ansicht des Schädels zur Darstellung der sella turcica, Artikulation der Wirbelsäule zum Schädel : die temporo-maxillaryaryartikulation auf einer Seite ist gut zu sehen. RADIOGRAPHIE DES SCHÄDELS 125 Intervalle, und der Schädel in drei oder mehr Abschnitte unterteilt, diese senkrecht Li

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. Radiography, X-ray therapeutics and radium therapy . kulls. a, Lateral view of norma] skull, showing frontal sinuses, sphenoidal sinuses, sella turcica, temporal bones, cervical vertebrae, and lower jaw. /-, A.ntero-posterior view I adult skull, showing Frontal sinuses, orbits, nasal l»^sr, anna. etc. Frontalsinus on Left side is opaque. c, Lateral view of skull to show the sella turcica, articulation of spine to skull : the temporo-maxillaryarticulation on one side is well seen. RADIOGRAPHY OF THE SKULL 125 intervals, and the skull divided into three or more sections, these perpendicu-lar lines being utilised as central points for the radiography of particularareas of the skull and face. The most useful lines are those drawn at the halfand third distances, or the whole line may be divided into thirds or quarters.It is hardly necessary in a work of this kind to describe variations of thisbase line, but for practical purposes several useful methods of localisationof areas of the skull will be described. For the examination of the mastoid. Fig. 105.—Dr. M. Berrys chair for frontal sinuses, etc. The region a good technique has been described by Dr. Howard Pirie.following is the technique he recommends : Technique.—The patient should lie prone on a firm couch. The head issupported on an inclined plane, making an angle of 25 degrees with the planeof the couch, as shown in Fig. 106. The photographic plate rests on thisinclined plane. The head is rotated 90 degrees so that the patient looks directlyto his side ; this brings the mastoid into contact with the plate. The pinna ofthe ear is turned forward, so as to obscure the mastoid as little as possible. Thesource of X-rays is placed vertically above the head, and the perpendicular rayis made to fall on a point 2 inches above the highest point of the pinna. Themastoid on each side must be skiagraphed separately. The glass of the focus tube should be 9 inches away from the hair. Theexposure required will turn a Saboura

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