Improving Limited Angle x-ray computed Tomography by Optical data integration - ILATO

通过光学数据集成改进有限角度 X 射线计算机断层扫描 - ILATO

• 批准号: 220034008
• 负责人: Professor Dr. Hans Georg Bock
• 金额: --
• 依托单位: Interdisziplinäres Zentrum für Wissenschaftliches Rechnen (IWR)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2012
• 资助国家: 德国
• 起止时间: 2011-12-31 至 2015-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/220034008?language=en
• 关键词: Improving; Limited; Angle; ray; computed

X-ray computed tomography (CT) offers a non-destructive method for the imaging, inspection and metrology of interior and exterior structures of a specimen. In classical cone-beam CT, the specimen is rotated by 360° in small angle steps in the cone-shaped beam of an X-ray tube. For each angular step, an X-ray absorption image of the specimen is recorded by an X-ray detector aligned with the X-ray source and the rotation table. For specimens deviating substantially from circular symmetry, at a set of rotation angles, the intensity of the transmitted X-ray radiation is often insufficient or the specimen does not fit inside the cone beam. Furthermore, for these samples, the achievable spatial resolution is low, because the specimen has to be moved at a large distance from the X-ray source. Therefore, modified scan procedures under the name “limited angle CT” have been suggested, where only a limited number of projections is recorded. Due to the limited information, the accuracy of the measurement varies significantly over the specimen.

X射线计算机断层扫描（CT）提供了一种非破坏性的方法，用于成像，检查和测量样品的内部和外部结构。在经典的锥形束CT中，样本在X射线管的锥形束中以小角度步进旋转360°。对于每个角度步长，由与X射线源和旋转台对准的X射线检测器记录样本的X射线吸收图像。对于基本上偏离圆对称的样本，在一组旋转角度下，透射的X射线辐射的强度通常不足或者样本不适合锥形束内部。此外，对于这些样品，可实现的空间分辨率是低的，因为样品必须在离X射线源很大的距离处移动。因此，已经提出了名为“有限角度CT”的修改的扫描程序，其中仅记录有限数量的投影。由于信息有限，测量的准确性在样品上变化很大。