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4. 发明公开

EP0487475A1 Method and apparatus for radiography 失效
标题翻译： Verfahren und VorrichtungfürRöntgenaufnahme。
公开(公告)号：EP0487475A1
公开(公告)日：1992-05-27
申请号：EP91850280.8
申请日：1991-11-13
申请人： PLANMED OY
发明人： Virta, Arto , Müller, Timo
IPC分类号： G21K1/02
CPC分类号： G21K1/025
摘要： A method and apparatus for radiographic techniques using an x-ray source (13). The radiographed object (M) is subjected to a beam (X) of radiation which is employed for forming a radiographic image of the object (M) onto a film (25). Between the radiographed object (M) and the film (25) is utilized a grid assembly (20) that prevents the disturbing effect of backscattered radiation or secondary radiation generated in the radiographed object on the radiographed image. The grid assembly (20) comprises a grid plate (22) having several equidistantly spaced lamellas opaque to x-rays. The x-rays can pass in the direction of the beam axis between the spaces (24) of said lamellas to the film (25). The grid plate is reciprocatingly oscillated at a varying amplitude so that the stops and changes of travel direction (K₁...K₅) are appropriately evenly distributed over the interlamellar spaces of the grid plate (22), thereby avoiding the imaging the grid lamellas (23) in a disturbing manner onto the film (25) or other imaging means.
摘要翻译：一种使用X射线源（13）的射线照相技术的方法和装置。拍摄对象（M）经受用于将物体（M）的放射线照相图像形成到膜（25）上的辐射束（X）。在射线拍摄物体（M）和胶片（25）之间使用栅格组件（20），其防止在射线照相图像上在射线照相物体中产生的背散射辐射或二次辐射的干扰效应。格栅组件（20）包括格子板（22），其具有对X射线不透明的几个等间隔的薄片。 X射线可以在所述薄片的空间（24）之间的光束轴线的方向上传播到薄膜（25）。格栅板以变化的幅度往复摆动，使得行进方向（K1 ... K5）的停止和变化适当均匀地分布在格栅板（22）的层间空间之间，从而避免了网格层（（25）或其他成像装置。

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