Resolution Enhancement by Variable Zoom Trajectory in X-Ray Computed Tomography

Journal of Nondestructive Evaluation, vol. 43

Abstract

Abstract Flat objects like electronic boards are challenging samples for high-resolution X-ray computed tomography scanning because their largest dimension significantly limits the magnification using circular trajectory scans. One way to improve spatial resolution for such samples is to utilize variable zoom trajectory. During variable zoom trajectory scanning, the source-to-object distance changes during the 360° rotation to maximize the magnification in the projections. Here, we propose an automatic variable zoom trajectory generation algorithm for arbitrary object and region of interest (ROI). We analyze how such a trajectory can enhance resolution in different cases and how isotropic is the resolution in the reconstructed volume. We demonstrate that the resolution can be improved without destroying the sample. However, the improvement is manifested mainly in directions in which we achieved the highest magnification in the projection.

Authors 6

1. Pavel Blažek corresponding Aachen

   Central European Institute of Technology · Baker Hughes (Germany) · Brno University of Technology · RWTH Aachen University

   Affiliation as printed

   Baker Hughes Digital Solutions GmbH, Wunstorf, Germany

   Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic

   WZL | RWTH Aachen University, Aachen, Germany

2. Alexander Suppes

   Baker Hughes (Germany)

   Affiliation as printed

   Baker Hughes Digital Solutions GmbH, Wunstorf, Germany

3. Dominik Wolfschläger Aachen

   RWTH Aachen University

   Affiliation as printed

   WZL | RWTH Aachen University, Aachen, Germany

4. Tomáš Zikmund

   Central European Institute of Technology · Brno University of Technology

   Affiliation as printed

   Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic

5. Jozef Kaiser

   Central European Institute of Technology · Brno University of Technology

   Affiliation as printed

   Central European Institute of Technology, Brno University of Technology, Brno, Czech Republic

6. Robert Heinrich Schmitt Aachen Fraunhofer Institute for Production Technology IPT

   Fraunhofer Institute for Production Technology IPT · RWTH Aachen University

   Affiliation as printed

   Fraunhofer Institute for Production Technology IPT, Aachen, Germany

   WZL | RWTH Aachen University, Aachen, Germany