High-Resolution Scanning Coded-Mask-Based X-ray Multi-Contrast Imaging and Tomography

Area of Science:

• Medical Imaging
• X-ray Imaging
• Phase Contrast Imaging

Background:

• Near-field X-ray speckle tracking offers higher contrast than absorption radiography.
• Existing methods using filters and cross-correlation have limited resolution or require extensive scanning.
• Single-shot coded-mask-based multi-contrast imaging (CMMI) shows improved efficiency and resolution.

Purpose of the Study:

• To present a scanning CMMI method for ultimate imaging resolution and phase sensitivity.
• To leverage coded masks as high-contrast speckle generators.
• To demonstrate enhanced performance compared to other speckle-based methods.

Main Methods:

• Utilizing a coded mask as a high-contrast speckle generator.
• Employing a flexible scanning mode with advanced maximum-likelihood optimization.
• Implementing multi-resolution analysis for enhanced data processing.

Main Results:

• Scanning CMMI achieves superior absorption, phase, and dark-field image quality.
• The method requires fewer scanning steps than other speckle-based techniques like X-ray speckle vector tracking.
• Successful demonstration in multi-contrast tomography.

Conclusions:

• Scanning CMMI provides higher resolution and phase sensitivity in X-ray imaging.
• The technique offers significant advantages over existing speckle-based imaging methods.
• Demonstrates potential for high-resolution full-field imaging, including in vivo biomedical applications.