2025-09-05 ノースウェスタン大学
Perovskite crystal boules — crystal formations that are transparent and free from cracks and inclusions — are used to create the detectors, which can can achieve record energy resolutions and unprecedented single-photon imaging performance, also paving the way for practical integration into next-generation nuclear medicine imaging systems.
<関連情報>
- https://news.northwestern.edu/stories/2025/09/first-perovskite-camera-can-see-inside-the-human-body
- https://www.nature.com/articles/s41467-025-63400-7
核医学向け高エネルギー・高空間分解能ペロブスカイト半導体を用いた単一光子γ線イメージング Single photon γ-ray imaging with high energy and spatial resolution perovskite semiconductor for nuclear medicine
Nannan Shen,Xuchang He,Tingting Gao,Bao Xiao,Yuquan Wang,Ruohan Ren,Haoming Qin,Khasim Saheb Bayikadi,Zhifu Liu,J. A. Peters,Bruce W. Wessels,Luyao Wang,Xiao Ouyang,Shuquan Wei,Qihao Sun,Xueping Liu,Yifei Lai,Xiaoping Ouyang,Zhifang Chai,Mercouri G. Kanatzidis & Yihui He
Nature Communications Published:30 August 2025
DOI:https://doi.org/10.1038/s41467-025-63400-7
Abstract
Integrating semiconductor detectors with high energy and spatial resolution is vital for advancing nuclear medicine imaging. Perovskite semiconductors afford unprecedented opportunity for reshaping radiation detection technologies. Nevertheless, perovskite semiconductors have yet to prove their ability in single photon γ-ray imaging, which is essential for enabling nuclear medicine imaging. Herein, we present a pioneering approach to develop high resolution perovskite CsPbBr3 detectors with pixelated configuration capable of imaging single γ-ray photons for nuclear medicine applications. Eliminating charge transport losses at the surface results in exceptional performance uniformity and long-term device stability, which confers near-unity charge collection efficiency and enhanced spectral resolving capabilities. Record energy resolutions are achieved as 2.5% at 141 keV and 1.0% at 662 keV. Single photon imaging with single point and line 99mTc γ-ray sources showcases the high sensitivity of 0.13%~0.21% cps/Bq. Phantom imaging distinctly delineates individual column sources spaced 7 mm apart, indicative of an impressive spatial resolution of 3.2 mm. These findings lay the groundwork for integrating perovskite detectors into nuclear medicine γ-ray imaging systems, offering a balance of cost-effectiveness and superior performance.
