Experimental Realisation of High-sensitivity Laboratory X-ray Grating-based Phase-contrast Computed Tomography

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Physics

Background:

• High-sensitivity X-ray phase-contrast imaging is crucial for high-resolution biomedical applications.
• Laboratory grating-based phase-contrast computed tomography (gbPC-CT) faces challenges like reduced flux and limited coherence compared to synchrotron sources.
• Existing laboratory setups struggle to achieve the sensitivity needed for advanced biomedical imaging.

Purpose of the Study:

• To present a novel laboratory X-ray Talbot-Lau interferometry setup for high-sensitivity phase-contrast imaging.
• To demonstrate a method for achieving sensitivity in laboratory gbPC-CT that surpasses other laboratory techniques.
• To enable quantitative electron density retrieval through stable tomographic scans.

Main Methods:

• Development of a laboratory X-ray Talbot-Lau interferometry setup operating at 40 kVp.
• Theoretical and experimental determination of angular sensitivity (minimum resolvable refraction angle).
• Comparison of setup performance with other differential phase-contrast techniques.
• Acquisition of stable tomographic scans for quantitative analysis.

Main Results:

• The developed laboratory setup achieves high sensitivity, unrivalled by other laboratory X-ray phase-contrast techniques.
• Experimental results for angular sensitivity align with theoretical predictions.
• The setup demonstrates stability suitable for tomographic imaging.
• Quantitative electron density retrieval was successfully demonstrated in preclinical studies.

Conclusions:

• The presented laboratory X-ray Talbot-Lau interferometry setup significantly advances high-sensitivity phase-contrast imaging.
• This technique overcomes limitations of previous laboratory gbPC-CT systems, enabling new biomedical applications.
• The ability to quantitatively retrieve electron density opens avenues for detailed preclinical research.