High-resolution lens-coupled indirect X-ray scintillator imagers are required by many imaging applications. However, the severe weakening of image details prevents its further performance improvement. Through our research, this image degradation is attributed to the broadband loss of the high-spatial-frequency information caused by the high refractive index. A technique known as high-spatial-frequency spectrum enhanced reconstruction is thus proposed to retrieve this information. A two-dimensional high-density array is covered on the scintillator’s exit surface and operates as an encoder based on which high-frequency information can be shifted to the low-frequency region to improve the signal-to-noise ratio. The experimental results show that the middle-high-frequency signal intensities can be increased by an order of magnitude or more, up to ∼50 times. Therefore, the image details can be effectively enhanced to break through the performance bottleneck of such widely used X-ray imagers for synchrotron radiation facilities or tabletop X-ray tubes.

中文翻译：

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使用光学编码方法在闪烁体成像器中以高保真度极大增强图像细节

许多成像应用都需要高分辨率透镜耦合间接 X 射线闪烁体成像仪。然而，图像细节的严重弱化阻碍了其进一步的性能提升。通过我们的研究，这种图像退化归因于高折射率引起的高空间频率信息的宽带损失。因此提出了一种称为高空间频谱增强重建的技术来检索此信息。一个二维高密度阵列覆盖在闪烁体的出射面上，作为编码器工作，在此基础上可以将高频信息转移到低频区域以提高信噪比。实验结果表明，中高频信号强度可以提高一个数量级甚至更多，约 50 次。因此，可以有效增强图像细节，突破同步辐射设备或桌面X射线管广泛使用的X射线成像仪的性能瓶颈。