X-ray phase contrast imaging by compact Talbot-Lau interferometer with a single transmission grating

Area of Science:

• Physics
• Materials Science
• Imaging Technology

Background:

• X-ray phase contrast imaging (XPCI) offers enhanced sensitivity for materials and biological samples.
• Traditional XPCI setups often require complex configurations with multiple gratings and specific source requirements.
• Developing simplified XPCI techniques is crucial for broader accessibility and application.

Purpose of the Study:

• To develop and demonstrate a simplified XPCI technique using a single transmission grating.
• To investigate the feasibility of XPCI with electron-beam generated, micro-structured x-ray sources.
• To obtain absorption, differential phase, and dark-field images with the novel setup.

Main Methods:

• Utilized a Talbot-Lau interferometer with a single transmission grating.
• Generated micro-structured x-ray lines (1 μm width) by irradiating multiline metal targets with electrons.
• Employed an x-ray image detector with 24 μm pixel size for data acquisition.
• Performed imaging at an 8 keV x-ray energy with a 1 m source-detector distance.

Main Results:

• Successfully achieved XPCI using only a single transmission grating.
• Directly resolved the self-image of a 3 μm pitch phase grating.
• Obtained high-quality absorption, differential phase contrast, and dark-field images.
• Demonstrated the capability of the system within a compact 1 m source-detector distance.

Conclusions:

• The single-grating XPCI method is effective and simplifies experimental setups.
• Electron-beam generated micro-structured x-ray sources are viable for advanced imaging.
• This technique broadens the potential applications of XPCI in various scientific fields.