Aix Marseille Université, CNRS, LP3, 13288, Marseille, France.
CEA, LIST, Department of Imaging and Simulation for Non-Destructive Testing, F-91191, Gif-sur-Yvette, France.
Sci Rep. 2020 Apr 21;10(1):6766. doi: 10.1038/s41598-020-63614-3.
This study explores the ability of a hard K x-ray source (17.48 keV) produced by a 10 TW class laser system operated at high temporal contrast ratio and high repetition rate for phase contrast imaging. For demonstration, a parametric study based on a known object (PET films) shows clear evidence of feasibility of phase contrast imaging over a large range of laser intensity on target (from ~10 W/cm to 7.0 × 10 W/cm). To highlight this result, a comparison of raw phase contrast and retrieved phase images of a biological object (a wasp) is done at different laser intensities below the relativistic intensity regime and up to 1.3 × 10 W/cm. This brings out attractive imaging strategies by selecting suitable laser intensity for optimizing either high spatial resolution and high quality of image or short acquisition time.
本研究探索了一种由运行在高时间对比度和高重复率下的 10 太瓦级激光系统产生的硬 X 射线源（17.48keV）在相位衬度成像中的能力。为了演示，基于已知物体（PET 膜）的参数研究表明，在很大的激光强度范围内（从约 10 W/cm 到 7.0×10 W/cm），相位衬度成像具有明显的可行性。为了突出这一结果，在低于相对论强度范围并高达 1.3×10 W/cm 的不同激光强度下，对一个生物物体（黄蜂）的原始相位衬度和恢复相位图像进行了比较。这提出了有吸引力的成像策略，通过选择合适的激光强度来优化高空间分辨率和高质量的图像或短采集时间。
