The influence of an aluminum compensation filter of complicated form on the signal-tonoise ratio in microtomography of geological cores was investigated. When scanning the core, a compensation filter in the form of an aluminum parallelepiped with a hole approximately equal to the diameter of the core was used. The filter is fixed rigid over the object table, the core is placed in the hole and rotates inside the filter. It is shown that the filter provides the maximal contrast of the useful signal over the entire dynamic range of the scintillation panel detector. After normalizing the projection of the core onto the filter projection without the core, the obtained projections were used in the standard reconstruction algorithm for cone beam tomography. The use of a compensation filter made it possible to increase the signal-to-noise ratio of the resulting tomograms by more than two times, as compared with the case of a conventional flat filter made of aluminum.

研究了复杂形式的铝补偿滤波器对地质岩心显微照相术中信噪比的影响。当扫描芯子时，使用铝制平行六面体形式的补偿过滤器，该补偿过滤器具有大约等于芯子直径的孔。过滤器固定在物台上方，芯子放在孔中并在过滤器内部旋转。结果表明，滤波器在闪烁面板检测器的整个动态范围内提供了有用信号的最大对比度。在将芯投影标准化到没有芯的滤光片投影上之后，将获得的投影用于锥束层析成像的标准重建算法中。