公开(公告)号：US5559853A

公开(公告)日：1996-09-24

申请号：US497964

申请日：1995-07-03

申请人： Petrus W. J. Linders ,  Marcel R. Bohmer ,  Michael J. M. J. Severens

发明人： Petrus W. J. Linders ,  Marcel R. Bohmer ,  Michael J. M. J. Severens

IPC分类号： G21K3/00 ,  A61B6/00 ,  G21K1/10 ,  H05G1/60

CPC分类号： G21K1/10 ,  H05G1/60

摘要： An X-ray examination includes a filter for limiting the dynamic range of an X-ray image formed on an X-ray detector by irradiation of an object, for example a patient to be examined, by means of X-rays. The filter has a number of electrodes and grains or powder particles containing an X-ray absorbing material and suspended in a suspension liquid. When a voltage is applied to electrodes, X-ray absorbing material in the suspension will move to the excited electrodes under the influence of electrophoresis. A distribution with a desired X-ray absorption profile is adjusted by application of a suitable voltage pattern. The electrodes may have dimensions of, for example 0.5.times.0.5 mm, enabling an X-ray absorption profile to be obtained with a high spatial resolution. The X-ray absorption profile can be changed within a brief period of time, for example within one second, by changing the voltage pattern on the electrodes.

摘要翻译： X射线检查包括用于通过X射线照射被检体（例如待检查患者）来限制在X射线检测器上形成的X射线图像的动态范围的滤波器。 该过滤器具有许多电极和含有X射线吸收材料并悬浮在悬浮液中的颗粒或粉末颗粒。 当对电极施加电压时，悬浮液中的X射线吸收材料将在电泳的影响下移动到激发电极。 通过施加合适的电压图来调整具有期望的X射线吸收曲线的分布。 电极可以具有例如0.5×0.5mm的尺寸，使得能够以高空间分辨率获得X射线吸收曲线。 可以通过改变电极上的电压图案在短时间内（例如在1秒钟内）来改变X射线吸收曲线。