Abstract Accurately characterizing the inner surface of monocapillary X-ray optics is important because the deformation of the inner wall is the greatest limitation on the quality of monocapillaries. Here, a contrast-enhanced microscopic computed tomography (micro-CT) technology was applied to measure the monocapillary. The 50 nm lead powder was used to fill the hollow part of a parabolic monocapillary X-ray optics (PMXO). The relative percentage of the hollow filled with lead powder versus the glass wall in grey values was about 6.92 times as much as that of the original PMXO, which is greatly conducive to CT reconstruction. In order to study the effect of inner radius error on the performance, a fitting cubic spline curve based on measured radius data was regarded as the inner profile to establish the mathematical model of actual PMXO. Then, a numerical calculation based on the ray-tracing method was used to simulate X-ray intensity distribution, transmission efficiency and divergence for the actual and designed (the parabolic equation parameter p = 0 . 001083793 mm) PMXOs, respectively. This methodology provides the potential for application in the 3D measurement and the quality assessment of the inner surface of monocapillary X-ray optics.

中文翻译：

---

用对比增强显微 CT 技术和射线追踪计算方法表征抛物线单毛细管的内表面

摘要 准确表征单毛细管 X 射线光学元件的内表面非常重要，因为内壁的变形是单毛细管质量的最大限制。在这里，应用对比增强显微计算机断层扫描 (micro-CT) 技术来测量单毛细血管。50 nm 铅粉用于填充抛物线单毛细管 X 射线光学器件 (PMXO) 的中空部分。铅粉填充的空心相对于玻璃壁灰度值的相对百分比约为原始PMXO的6.92倍，极大地有利于CT重建。为了研究内半径误差对性能的影响，以基于实测半径数据的拟合三次样条曲线为内轮廓，建立实际PMXO的数学模型。然后，基于射线追踪方法的数值计算分别用于模拟实际和设计（抛物线方程参数 p = 0 . 001083793 mm）PMXO 的 X 射线强度分布、传输效率和发散度。这种方法提供了在单毛细管 X 射线光学器件内表面的 3D 测量和质量评估中的应用潜力。