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Target Design in SEM-Based Nano-CT and Its Influence on X-ray Imaging.

Jonas Fell1, Felix Wetzler1, Michael Maisl2

  • 1Lightweight Systems, Department of Materials Science, Campus E3 1, Saarland University, 66123 Saarbrücken, Germany.

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|August 25, 2023
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Summary

Researchers optimized nano-computed tomography (nano-CT) by designing varied X-ray targets. Different target geometries enhance image quality for diverse material characterization applications, improving nano-CT performance.

Keywords:
SEM-based CTX-ray sourceX-ray targetimage qualitynano-CTspatial resolution

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Area of Science:

  • Materials Science
  • Physics
  • Imaging Technology

Background:

  • Scanning electron microscopy (SEM)-based nano-computed tomography (nano-CT) offers multimodal material characterization.
  • SEM-based CT's geometrical magnification allows adaptable X-ray targets without system modification.

Purpose of the Study:

  • To investigate how varying X-ray target geometry and composition influence nano-CT image quality.
  • To recommend optimal target designs for specific material characterization applications.

Main Methods:

  • Investigated three target geometries: bulk, foil, and needle targets.
  • Analyzed electron beam properties and X-ray beam path for each target design.
  • Evaluated the impact of target design on X-ray imaging performance.

Main Results:

  • A platinum (Pt) bulk target (25° tilt) provides high photon flux and spatial resolution for fast scans of high-absorbing samples.
  • A chromium (Cr) target (30° tilt) enhances image contrast for low-absorbing materials like polymers.
  • A tungsten (W) needle target (approx. 100 nm tip diameter) achieves maximum spatial resolution of ~100 nm.

Conclusions:

  • X-ray target design is crucial for optimizing nano-CT performance.
  • Specific target geometries and materials are recommended for different imaging tasks, enhancing resolution, contrast, and speed.