File:Radiography, x-ray therapeutics and radium therapy (1915) (14777428013).jpg

Identifier: radiographyxrayt00knoxuoft (find matches)
Title: Radiography, x-ray therapeutics and radium therapy
Year: 1915 (1910s)
Authors: Knox, Robert, 1868-1928
Subjects: Radiography Radiotherapy X-rays
Publisher: London : A. & C. Black
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: MSN

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24 KADIOGRAPHY is placed to correspond with the angle on the apparatus, the plate being placedalways at the same angle in relation to the tube. An efficiently protectedtube-box is placed on the back of the chair. It can be accurately centred,and has both vertical and transverse movements to facilitate rapid adjustmentbehind the part to be radiographed. The tube always occupies the same re-lationship to the plate, the head being tilted to the required angle. To obtaina picture of the two sphenoidal sinuses side by side, a plate is placed underthe chin and the tube over the vortex at right angles to the plate. A filmplaced in the mouth well backwards under the head and soft palate will givea similar picture. Or the patient may lie on a couch with the plate under-neath and a compressor extension tube brought down on to the head ; thisserves the double purpose of fixing the head and cutting off secondary radia-tions from the tube. The principle of the compressor tube has been already dis-
Text Appearing After Image:
FiG. 104.—Sweet localiser. cussed. Care must be taken to see that the long axis of the tube is parallelwitn 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 determiiied by a method elabor-ated by Dr. R. W. A. Salmond and the author. A point is taken on thefront of the face correspondmg to the nasion, and a line is drauii 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 dra\Nai perpendicularly upwards at stated RADIOGKAPHY OF THE SKULL 125 intervals, and the skull divided into

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