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    • 4. 发明公开
    • Method and apparatus for panoramic radiography
    • Verfahren und VorrichtungfürPanorama-Röntgenaufnahmen。
    • EP0499595A1
    • 1992-08-19
    • EP92850024.8
    • 1992-02-07
    • PLANMECA OY
    • Virta, ArtoStrömmer, PekkaMüller, Timo
    • A61B6/14
    • A61B6/14
    • The invention concerns a method and apparatus for narrow-beam tomography in which x-ray radiation is aimed to pass through the object to be radiographed onto a movable (v₁) x-ray film (F). The object (P) is kept stationary in a certain position, while the x-ray source and the film cassette (14) are rotated about a vertical virtual axis of rotation (A-A). In the first operating mode for the panoramic radiography of the dental arch the patient (P) is supported by positioning means so that the sharply imaging plane (P-P) is located between the virtual axis of rotation (A-A) of the x-ray beam (X) and the film plane. In the second operating mode for the radiography of transversal projections of the dental arch (L) the patient (P) is supported in such a stationary position that the virtual axis of rotation (A-A) of the x-ray beam (X) is located in the area between the sharply imaging tissue layer (P-P) and the film plane (F). In the second operating mode the film (F) is moved in a direction which is opposite to the film transfer direction in the first operating mode.
    • 本发明涉及一种用于窄光束层析成像的方法和装置,其中x射线辐射旨在穿过要被放射照射的物体到可移动(v1)X射线胶片(F)上。 物体(P)在某一位置保持静止,而X射线源和胶片盒(14)围绕垂直虚拟旋转轴线(A-A)旋转。 在用于牙弓全景摄影的第一操作模式中,患者(P)由定位装置支撑,使得急剧成像平面(PP)位于x射线束的虚拟旋转轴线(AA)( X)和薄膜平面。 在用于牙弓(L)的横向突起的放射线照相的第二操作模式中,患者(P)被支撑在这样的静止位置,即X射线束(X)的虚拟旋转轴线(AA)位于 在急剧成像组织层(PP)和膜平面(F)之间的区域中。 在第二操作模式中,胶片(F)在第一操作模式下沿与膜传送方向相反的方向移动。