Abstract
X-ray radiography is the most widely used imaging technique with applications encompassing medical and industrial imaging, homeland security, and materials research. Although a significant amount of research and development has gone into improving the spatial resolution of the current state-of-the-art indirect X-ray detectors, it is still limited by the detector thickness and microcolumnar structure quality. This paper demonstrates high spatial resolution X-ray imaging with solution-processable two-dimensional hybrid perovskite single-crystal scintillators grown inside microcapillary channels as small as 20 µm. These highly scalable non-hygroscopic detectors demonstrate excellent spatial resolution similar to the direct X-ray detectors. X-ray imaging results of a camera constructed using this scintillator show Modulation Transfer Function values significantly better than the current state-of-the-art X-ray detectors. These structured detectors open up a new era of low-cost large-area ultrahigh spatial resolution high frame rate X-ray imaging with numerous applications.
Highlights
X-ray image of the PEALPB camera.Detector PEALPB (This study) Microcolumnar CsI Pixelated Microcolumnar CsI Microcolumnar CsCu2I3 Timepix with Si amorphous selenium (a-Se) MAPbI3these images where the darkening effect from the extramural pattern requires extensive correction, making the use of absorption layers unsuitable for low-dose X-ray imaging.Further optimization of the camera and coupling of detector plates with pixelated CMOS or a–Si:H backplanes holds the potential to improve the spatial resolution further significantly
We successfully filled 100 and 20-micron pore diameter microcapillary plates with single-crystalline PEALPB perovskite scintillator with similar X-ray attenuation coefficients compared to CsI (e.g. 1.9 vs. 1.8 cm2/g at 100 keV) and demonstrated an X-ray imager using this sensor
We have demonstrated the feasibility of high spatial resolution X-ray radiography using PEALPB scintillator-based detectors
Summary
Further optimization of the camera and coupling of detector plates with pixelated CMOS or a–Si:H backplanes holds the potential to improve the spatial resolution further significantly. We expect these optimized microcapillary-based detectors to perform even better than the results shown in this paper. The combination of efficiency with higher thicknesses and spatial resolution will provide unique solutions to many untapped imaging applications These optimized detectors will be a good candidate for neutron radiography, thereby providing a detector solution for X-ray and neutron multimodal radiography. The phase of our study will demonstrate such approaches
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