A new approach to synchrotron energy-dispersive X-ray diffraction computed tomography

Area of Science:

• Materials Science
• Physics
• Imaging Technology

Background:

• Synchrotron X-ray diffraction computed tomography (XRD-CT) is crucial for materials analysis.
• Existing angle-dispersive XRD-CT methods face limitations with sample size and peak broadening.

Purpose of the Study:

• To introduce a new data collection strategy for synchrotron energy-dispersive X-ray diffraction computed tomography (EDXRD-CT).
• To evaluate the performance and limitations of this novel EDXRD-CT method compared to angle-dispersive techniques.

Main Methods:

• A collimator defines a small sampling voxel, preserving energy resolution.
• The voxel is translated along lines and rotated, generating diffraction patterns at each step.
• The method was validated using a specifically designed phantom object.

Main Results:

• The novel EDXRD-CT method demonstrates good reconstruction accuracy.
• Spatial resolution is limited only by the scanning beam width.
• The technique is well-suited for large objects, avoiding diffraction peak broadening issues inherent in angle-dispersive methods.
• Absorption correction is necessary for lower energy diffraction due to extended path lengths.

Conclusions:

• The developed EDXRD-CT strategy provides a viable alternative for imaging large-scale materials.
• Its strengths lie in high spatial resolution and applicability to samples of any size.
• Further optimization is needed to improve the current poor temporal resolution for practical applications.