The binary dissector: phase contrast tomography of two- and three-material objects from few projections

Area of Science:

• Materials Science
• Medical Imaging
• Physics

Background:

• Conventional X-ray computed tomography (CT) requires more viewing angles, longer scan times, and higher radiation doses for increased information needs like higher resolution.
• Existing CT methods face limitations in balancing information acquisition with sample integrity and efficiency.

Purpose of the Study:

• To demonstrate a novel phase-contrast imaging technique for material dissection in X-ray CT.
• To show that this method can satisfy increased information requirements without additional viewing angles, reducing scan time and radiation dose.

Main Methods:

• Utilizing phase-contrast imaging to differentiate materials within an object.
• Combining this with binary tomographic techniques for reconstruction.
• Investigating the impact of noise on the reconstruction using simulated data.
• Reconstructing a sample using an X-ray ultra Microscope (XuM).

Main Results:

• The proposed imaging scheme successfully "dissects" two- and three-material objects into their constituent components.
• A significant reduction in scanning time and delivered dose (by at least an order of magnitude) compared to conventional X-ray CT was achieved.
• A slice of a glass tube containing silica and water was reconstructed from a limited number of projection images (18).

Conclusions:

• Phase-contrast imaging offers a more efficient and less invasive approach to X-ray CT for complex material analysis.
• This technique overcomes the conventional trade-off between information content and imaging parameters in X-ray CT.
• The method holds promise for applications requiring high-resolution material differentiation with reduced scanning time and radiation exposure.