X-ray phase, absorption and scatter retrieval using two or more phase contrast images

Area of Science:

• Medical Imaging
• Materials Science
• Physics

Background:

• Analyser-based phase contrast imaging offers rich information beyond simple absorption.
• Existing phase retrieval techniques can be limited by dose, complexity, or applicability to dynamic samples.

Purpose of the Study:

• To develop advanced phase-retrieval techniques for analyser-based phase contrast imaging.
• To extract comprehensive X-ray interaction properties (absorption, refraction, scattering) of objects.
• To improve dose efficiency and enable imaging of dynamic processes.

Main Methods:

• Developed a novel technique using Pearson type VII function fitting of rocking curves measured with and without a sample.
• Implemented an iterative phase retrieval approach utilizing simultaneously recorded images and Laue crystal geometry.
• Focused on quantitative phase retrieval for dynamic object imaging.

Main Results:

• The first technique accurately fits rocking curves, enhancing existing methods.
• The second technique significantly reduces X-ray dose requirements.
• The second technique enables quantitative phase retrieval for moving objects.

Conclusions:

• The developed techniques offer significant advancements in analyser-based phase contrast imaging.
• These methods provide detailed material property information and enable new imaging applications, including dynamic studies.
• The techniques promise improved dose efficiency and broader applicability in scientific and medical fields.