20 Hz高时空分辨X射线单色光动态显微CT研究  

Study of 20 Hz high spatial-temporal resolution monochromatic X-ray dynamic micro-CT

作　　者：仇正杰 李可 谢红兰[1,2] 杜国浩 邓彪[1,2] 肖体乔 QIU Zhengjie;LI Ke;XIE Honglan;DU Guohao;DENG Biao;XIAO Tiqiao(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China;Shanghai Synchrotron Radiation Facility,Shanghai Advanced Research Institute,Chinese Academy of Sciences,Shanghai 201204,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院上海应用物理研究所,上海201800 [2]中国科学院上海高等研究院上海同步辐射光源,上海201204 [3]中国科学院大学,北京100049

出　　处：《核技术》2023年第7期13-22,共10页Nuclear Techniques

基　　金：国家重大科研仪器研制项目(No.11627901)资助。

摘　　要：与白光X射线动态显微CT(Micro Computed Tomography)相比,单色光X射线动态显微CT具有较低的辐射损伤和较高的密度分辨率,但是更难以平衡其空间和时间分辨率。目前,单色光X射线动态显微CT的最高时间分辨率可达到13.3 Hz,探测器有效像素尺寸为5μm。为了构建具有更高时空分辨率的单色光X射线动态显微CT系统,基于上海光源快速X光成像线站(BL16U2)的高通量密度单色光,将高速转台与三镜头大数值孔径快速X射线成像探测器相结合,构建了实验系统。以速发型聚氨酯材料为研究对象进行了验证实验,在15 keV单色光下动态显微CT的时间分辨率达到了20 Hz,探测器有效像素尺寸为2.2μm。对气泡运动进行相关定量分析,证明该系统具有高时空分辨率和高对比度分辨率,可以对复杂运动系统进行四维时空定量分析,为BL16U2线站用户进行高时空分辨率的复杂原位研究提供了强大的实验平台。[Background]Dynamic micro-computed tomography(micro-CT)using monochromatic X-ray offers higher density resolution and lower radiation damage compared to that using white X-ray,however balancing its imaging spatial and temporal resolution is challenging.Currently,the reported highest temporal resolution of monochromatic X-ray dynamic micro-CT is 13.3 Hz with a detector effective pixel size of 5μm.[Purpose]This study aims to develop a monochromatic X-ray dynamic micro-CT system with a higher spatial and temporal resolution to meet the experimental needs of the fast X-ray imaging beamline(BL16U2)users at Shanghai Synchrotron Radiation Facility(SSRF).[Methods]Firstly,an experimental system of dynamic micro-CT with the high flux density monochromatic X-ray from an undulator source was established by combination of a high-speed rotary stage and a large numerical aperture triple-lens fast X-ray imaging detection system on the BL16U2 beamline at SSRF.Then,a demonstration experiment with a fast-foaming polyurethane material as a sample was performed to examine the spatial-temporal resolution of this experimental system,moreover a quantitative analysis of the bubble motion during foaming process was performed.[Results]Experimental results of foaming process of the fast-foaming polyurethane material based on the monochromatic X-ray dynamic micro-CT system show that a temporal resolution of 20 Hz of the dynamic micro-CT was achieved with 15 keV monochromatic X-ray and an effective detector pixel size of 2.2μm.[Conclusions]The developed monochromatic X-ray dynamic micro-CT system has a high spatial-temporal resolution and can perform four-dimensional quantitative analysis of complex motion systems,providing a powerful experimental research platform for users of BL16U2 beamline at SSRF.

关 键 词：X射线动态显微CT 快速X射线成像 X射线单色光显微CT 同步辐射 

分 类 号：TL544[核科学技术—核技术及应用] TL99