| 摘要 |
<p>The present invention pertains to the field of computer-assisted tomography that comprises obtaining images of an object from a small-angle diffused radiation. The diffusion is recorded at ultra-small angles of between 0 and 1° relative to the orientation of the incident beam. A series of circuits is used for recording a coherent diffusion at the above-mentioned angles. The fan-shaped beams which are generated using a collimator and have a reduced divergence are directed towards the object. In one embodiment of the device for separating the radiation diffused at ultra-small angles, a special three-dimensional filter is arranged behind the object. This filter has a structure which is similar to that of the collimator, wherein the sections of the collimator which are transparent to the radiation are covered by the non-transparent sections of the filter. A three-dimension sensitive detector is arranged behind the filter, wherein the radiation cannot reach said detector in the absence of the object.</p> |
