圆柱形物体的快速层析检测
Fast tomographic inspection of cylindrical objects
摘要：
本文提出了一种改进的方法，分析对象的轴对称使用X射线计算机断层扫描（CT）。圆柱坐标轴固定到对象形成最自然的基础来检查对象的某些特性，包含这种对称性，经常发生与工业零件。采样网格对应于对象，允许下采样，从而减少重建时间。这对于在线应用和快速质量检测是必要的。通过代数重建，它允许使用预先计算的初始体积，非常适合一系列扫描，其中相同类型的对象可以具有不同的位置和方向，这在工业环境中经常遇到。当一些区域更可能发生变化时，也可以包括加权反投影，以提高稳定性。建立在笛卡尔网格重建代码，重复使用现有的光线跟踪器的可行性检查对其他研究在同一领域。
英文摘要：
This paper presents a method for improved analysis of objects with an axial symmetry using X-ray Computed Tomography (CT). Cylindrical coordinates about an axis fixed to the object form the most natural base to check certain characteristics of objects that contain such symmetry, as often occurs with industrial parts. The sampling grid corresponds with the object, allowing for down-sampling hence reducing the reconstruction time. This is necessary for in-line applications and fast quality inspection. With algebraic reconstruction it permits the use of a pre-computed initial volume perfectly suited to fit a series of scans where same-type objects can have different positions and orientations, as often encountered in an industrial setting. Weighted back-projection can also be included when some regions are more likely subject to change, to improve stability. Building on a Cartesian grid reconstruction code, the feasibility of reusing the existing ray-tracers is checked against other researches in the same field.
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