Single-shot K-edge subtraction x-ray discrete computed tomography with a polychromatic source and the Pixie-III...

Area of Science:

• Medical Imaging
• Materials Science
• Physics

Background:

• K-edge subtraction (KES) imaging traditionally requires synchrotron radiation sources for elemental mapping.
• Modern X-ray photon-counting detectors (XPCDs) offer energy discrimination capabilities suitable for conventional sources.
• Implementing KES with polychromatic sources enables wider accessibility for elemental analysis in tissues.

Purpose of the Study:

• To develop and evaluate a single-shot KES imaging system using a conventional polychromatic X-ray source.
• To demonstrate the feasibility of reliable elemental localization, specifically Barium, within biological tissues.
• To enable high-fidelity 3D elemental mapping for morphological quantification and potential in vivo applications.

Main Methods:

• Utilized an X-ray CT imaging system incorporating the Pixie-III detector.
• Employed discrete reconstruction algorithms for image processing.
• Performed K-edge subtraction imaging with a conventional polychromatic X-ray source.

Main Results:

• Achieved reliable automatic localization of Barium at concentrations above a certain threshold.
• Demonstrated successful elemental mapping using a limited number of tomographic projections (dozens).
• Generated high-fidelity 3D maps of Barium distribution within a 512x512 pixel axial slice volume.

Conclusions:

• Single-shot KES imaging is feasible with conventional X-ray sources and XPCDs.
• The developed system enables routine, high-fidelity 3D elemental mapping.
• This technique holds promise for in vivo applications requiring specific element quantification and morphological analysis.