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High sensitivity X-ray phase contrast imaging by laboratory grating-based interferometry at high Talbot order
Optics Express
|March 17, 2021
Summary
This study introduces a compact laboratory X-ray phase contrast imaging system using grating-based X-ray interferometry. The system achieves high angular sensitivity and spatial resolution for materials science and biomedical applications.
Area of Science:
- Physics
- Materials Science
- Biomedicine
Background:
- X-ray phase contrast imaging offers advanced analysis capabilities.
- Existing systems can be large and complex.
Purpose of the Study:
- To develop a compact, high-performance laboratory X-ray phase contrast imaging system.
- To demonstrate its utility in materials science and biomedical imaging.
Main Methods:
- Utilized laboratory grating-based X-ray interferometry with a microfocus X-ray source.
- Employed a high Talbot order (35th) asymmetric geometry.
- Combined small period X-ray gratings (1.0-3.0 µm) and a single-photon counting detector (75 µm pixel size).
Main Results:
- Achieved high angular sensitivity (∼50 nrad) at 19 keV.
- Demonstrated high spatial resolution in a compact system (<1 m length).
- Obtained high-resolution X-ray phase tomographies of biological samples (mouse embryo, human heart tissue) with 21.5 µm resolution.
Conclusions:
- The developed compact system provides high angular sensitivity and spatial resolution.
- It shows significant potential for laboratory-based biomedical imaging and materials analysis.
