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Dynamic X-ray imaging with screen-printed perovskite CMOS array.

Yanliang Liu¹, Chaosong Gao², Dong Li¹

¹Materials Interfaces Center, Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong, China.

Nature Communications

|February 21, 2024

Summary

This summary is machine-generated.

This study introduces a new perovskite CMOS X-ray detector for advanced biomedical imaging. It achieves high resolution and speed at low radiation doses, enabling dynamic imaging and CT scans.

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Area of Science:

Materials Science
Medical Imaging
Semiconductor Physics

Background:

High-performance X-ray detectors are essential for biomedical imaging, requiring ultra-high spatial and temporal resolution.
Current detectors face limitations in resolution, speed, and radiation dose efficiency.

Purpose of the Study:

To develop and characterize a dynamic direct-conversion CMOS X-ray detector using screen-printed cesium lead bromide (CsPbBr3).
To evaluate its performance for high-resolution, large-area, low-dose dynamic biomedical X-ray and CT imaging.

Main Methods:

Fabrication of a direct-conversion CMOS X-ray detector with screen-printed CsPbBr3.
Characterization of detector performance, including mobility-lifetime product, X-ray sensitivity, spatial resolution, and frame rate.
Imaging of large samples and reconstruction of 3D tomographic images.

Main Results:

The CsPbBr3 detector achieved a mobility-lifetime product of 5.2 × 10^-4 cm^2 V^-1 and X-ray sensitivity of 1.6 × 10^4 μC Gyair^-1 cm^-2.
Rapid imaging of samples >5 cm × 10 cm at 300 frames per second.
Demonstrated high spatial resolution (5.0 lp mm^-1) at a low radiation dose (260 nGy) and successful 3D CT reconstruction.

Conclusions:

The perovskite CMOS detector offers superior performance compared to traditional indirect-conversion detectors.
It shows significant potential for dynamic biomedical X-ray and CT imaging, non-destructive testing, and security scanning.
This technology advances the development of next-generation X-ray imaging systems.