| 摘要 |
<p>The specification relates to an apparatus for panoramic X-ray photography of the area of the dentition and the jaws, the apparatus comprising a frame part (1), a bearing part (2) linearly movable in relation to the frame part, and a support arm (10) attached with bearings rotatably to the bearing part, the arm having at one end an X-ray film (11) and at the opposite end a source of X-radiation (12). The movements of the bearing part (2), the support arm (10) and the film (11) are mutually synchronized in such a way that an image of an area of the desired shape, for example the shape of the patient's dental arch, is obtained on the film during the movement. It is the object of the invention to provide a possibility, without shifting the patient, to alter the enlargement coefficient and, as an additional effect, to provide the possibility of tilting the X-ray beam to the desired angle in relation to the horizontal plane, whereby it will be possible to photograph more sharply than previously, for example, teeth oblique in relation to the vertical level. In accordance with the invention, the support arm (10) is attached to the bearing part (2) by mediation of structural parts (9, 16) which are equipped with guides (22, 24) extending in the longtudinal direction of the support arm (10) and with transfer means (19, 20, 21), in such a way that the support arm (10), in other words the source of radiation (12) and the X-ray film (11), can be transferred in a direction parallel to the X-ray beam. Furthermore, the said structural parts (9, 16) have curved rails (13, 14) which work in conjunction with each other, the mutual movement of the rails affecting the tilt of the support arm. The adjustment movements are preferably effected by stepping motors.</p> |
