. Radiography, X-ray therapeutics and radium therapy . sed ; this possesses the great advantage of preventing movementsduring the exposure ; a piece of cork or a towel rolled up tight is also veryefficacious when other appliances are not at hand. Special appliances have been devised for the retention of the film in themouth. A suitably-shaped cork is provided with a slot, into which variousrectangular plates of metal are slipped. These metal plates are soft, and can 9 130 RADIOGRAPHY be bent into any curve to suit the contour of the mouth, and thus secure aclose contact. The films are wrapped
. Radiography, X-ray therapeutics and radium therapy . sed ; this possesses the great advantage of preventing movementsduring the exposure ; a piece of cork or a towel rolled up tight is also veryefficacious when other appliances are not at hand. Special appliances have been devised for the retention of the film in themouth. A suitably-shaped cork is provided with a slot, into which variousrectangular plates of metal are slipped. These metal plates are soft, and can 9 130 RADIOGRAPHY be bent into any curve to suit the contour of the mouth, and thus secure aclose contact. The films are wrapped up in paper as usual, with a smallloop of paper left at the back, which is slipped over the metal plate, so thatany curve to which the plate is bent also carries the film with it. The cork is gripped in the mouth by the patient, it being obvious thatthis method enables the film to be held in any position inside the mouthwithout any further device or support. The Cervical Region The best positions in which to radiograph this area are : (1) The antero-. Fig. 109.—Upper cervical region, anteroposterior with plate behind and an extension tube in front of the open mouth. posterior, and (2) the lateral. The antero-posterior is comparatively easy inthe lower two-thirds. When the patient is placed with the posterior aspecton the plate and the tube centred over the middle of the plate, a view is ob-tained of the whole of the cervical vertebrae and the upper dorsal, the apicesof the lungs coming into the picture, as do also the sternal ends of the claviclesand the manubrium sterni. The upper cervical vertebrae are obscured bythe basi occiput and the lower maxilla. Should it be necessary to obtain an impression of the first three cervicalvertebrae, other methods must be adopted. The base of the occiput and the THE CERVICAL REGION 131 first and second cervical vertebrae may be examined by placing a plate onthe posterior aspect; and by using a small extension tube, with the mou
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