Capillary Manganese Halide Needle-Like Array Scintillator with Isolated Light Crosstalk for Micro-X-Ray Imaging

Area of Science:

• Materials Science
• Medical Imaging
• Optics

Background:

• Increasing scintillator thickness in X-ray imaging exacerbates light scattering, challenging the balance between spatial resolution and brightness.
• Existing technologies struggle to maintain high resolution with thicker scintillators required for improved performance.

Purpose of the Study:

• To engineer a thick pixelated needle-like array scintillator with micrometer resolution.
• To overcome the limitations of light scattering in thick scintillators for enhanced X-ray imaging.

Main Methods:

• Fabrication of a pixelated scintillator using waveguide structure engineering.
• Integration of a low-temperature melting process of manganese halide with an aluminum-clad capillary template.
• Analysis using laser diffraction experiments to confirm photon propagation and confinement.

Main Results:

• Achieved ultrahigh spatial resolutions of 60.8 and 51.7 lp mm⁻¹ (at MTF 0.2) on 0.5 mm and 1 mm thick scintillators, respectively.
• Demonstrated micrometer resolution exceeding the pore diameter of the capillary template (Φ = 10 µm).
• Confirmed isolated light-crosstalk channels and robust light output due to increased thickness and waveguide structure.

Conclusions:

• The developed thick scintillator achieves unprecedented micrometer resolution, among the highest for metal halide scintillators on thick samples.
• This waveguide engineering approach provides a viable solution for high-resolution X-ray imaging demands across various fields.
• Presents a pathway for developing advanced thick scintillators without compromising spatial resolution or brightness.