High-sensitivity and spatial resolution benchtop cone beam XFCT imaging system with pixelated photon counting...

Area of Science:

• Medical Imaging
• Nanotechnology
• Biomedical Engineering

Background:

• High atomic number element nanoparticles show promise for tumor diagnosis and therapy.
• X-ray fluorescence computed tomography (XFCT) enables quantitative imaging of these elements.
• Improving XFCT's sensitivity, resolution, and speed is crucial for biomedical applications.

Purpose of the Study:

• To enhance XFCT imaging performance using a novel detector.
• To address signal degradation issues in photon-counting detectors.
• To demonstrate the feasibility of dual-modality XFCT/CBCT imaging for preclinical tumor studies.

Main Methods:

• Utilized a high-energy resolution pixelated photon-counting detector for XFCT.
• Implemented energy and interaction position corrections to mitigate multi-pixel event degradation.
• Validated the correction algorithm using PMMA phantoms for sensitivity and spatial resolution assessments.

Main Results:

• The implemented corrections significantly improved XFCT system sensitivity and spatial resolution.
• Successfully achieved dual-modality XFCT/CBCT imaging of gadolinium nanoparticles in a mouse subcutaneous tumor model.
• Demonstrated enhanced quantitative imaging of high atomic number elements.

Conclusions:

• The developed correction algorithm effectively enhances XFCT imaging performance.
• The XFCT/CBCT dual-modality system shows strong potential for preclinical research in nanoparticle-based tumor diagnosis and therapy.
• This advancement supports the clinical translation of XFCT for oncological applications.