. Radiography, x-ray therapeutics and radium therapy . FiG. 104.—Sweet localiser. cussed. Care must be taken to see that the long axis of the tube is parallelwith the plate, and that the anti-cathode of the tube is accurately centred inthe tube-box before the tube is brought into position. For general purposes acentral position of the tube is all that is necessary, the anti-cathode beingover the centre of the plate, and the base line of the skull corresponding asnearly as possible with the centre line of the plate in its longest diameter. The base line of the skull can readily be determined by
. Radiography, x-ray therapeutics and radium therapy . FiG. 104.—Sweet localiser. cussed. Care must be taken to see that the long axis of the tube is parallelwith the plate, and that the anti-cathode of the tube is accurately centred inthe tube-box before the tube is brought into position. For general purposes acentral position of the tube is all that is necessary, the anti-cathode beingover the centre of the plate, and the base line of the skull corresponding asnearly as possible with the centre line of the plate in its longest diameter. The base line of the skull can readily be determined by a method elabor-ated by Dr. E. W. A. Salmond and the author. A point is taken on thefront of the face corresponding to the nasion, and a line is drawn from thispoint backwards through the external auditory meatus to the occipital bone,ending in the vicinity of the external occipital protuberance. From thisline as a base, other lines may be drawn perpendicularly upwards at stated. PLATE I.—Normal Skulls. a, Lateral view of normal skull, showing frontal sinuses, sphenoidal sinuses, sella turcica, temporal bones,cervical vertebras, and lower jaw. h, Antero-posterior view of adult skull, showing frontal sinuses, orbits, nasal fossae, antra, etc. 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. KADIOGRAPHY OF THE SKULL 125 intervals, and the skull divided iato 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 is hardly necessary in a work of thLs 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 examin
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