X-ray in-line phase tomography of multimaterial objects.

Area of Science:

• X-ray imaging
• Diffraction imaging
• Phase retrieval

Background:

• X-ray Fresnel diffraction patterns are used for imaging.
• Previous methods assumed homogeneous objects and used Radon domain techniques.
• Handling multimaterial objects in phase retrieval is challenging.

Purpose of the Study:

• To develop a novel phase retrieval method for multimaterial objects using x-ray Fresnel diffraction.
• To improve upon existing algorithms by incorporating prior knowledge in the object domain.

Main Methods:

• A tomographic reconstruction of an attenuation scan is performed.
• Prior knowledge about object composition is introduced in the object domain.
• Forward projection generates a priori phase maps for reconstruction.

Main Results:

• The method successfully reconstructs objects composed of both soft and hard materials.
• The new algorithm demonstrates superior performance compared to previous methods.
• Phase retrieval is enhanced by applying object-domain priors.

Conclusions:

• The presented method enables accurate phase retrieval for multimaterial objects.
• Object-domain prior knowledge significantly improves x-ray diffraction imaging.
• This advancement offers better reconstruction for complex material compositions.