四通道球面弯晶成像系统设计及实验研究

忻秋琪; 李亚冉; 陈亮; 刘汉威; 徐捷; 王新; 穆宝忠

doi:10.11884/HPLPB201931.190006

四通道球面弯晶成像系统设计及实验研究

doi: 10.11884/HPLPB201931.190006

忻秋琪^{1, 2,},
李亚冉^{1, 2},
陈亮^{1, 2},
刘汉威^{1, 2},
徐捷^{1, 2},
王新^{1, 2},
穆宝忠^{1, 2, ,}

1.
同济大学教育部先进微结构材料重点实验室, 上海 200092
2.
同济大学物理科学与工程学院, 上海 200092

基金项目:

国家重点研发计划项目 2017YFA0403300

详细信息

作者简介:
忻秋琪(1993-), 男，硕士，主要从事X射线成像研究；xinqiuqi@tongji.edu.cn

通讯作者:
穆宝忠(1975-), 男，教授，主要从事X射线光学系统研究；mubz@tongji.edu.cn

中图分类号: O434.1
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- 被引次数: 4
出版历程
- 收稿日期: 2019-01-07
- 修回日期: 2019-03-26
- 刊出日期: 2019-05-15

Design and experimental research of four-channel spherically bent crystal imaging system

Xin Qiuqi^{1, 2
,},
Li Yaran^{1, 2},
Chen Liang^{1, 2},
Liu Hanwei^{1, 2},
Xu Jie^{1, 2},
Wang Xin^{1, 2},
Mu Baozhong^{1, 2
, ,}

1.
Key Laboratory of Advanced Micro-structured Materials, Ministry of Education, Tongji University, Shanghai 200092, China
2.
School of Physics Science and Engineering, Tongji University, Shanghai 200092, China

摘要

摘要:
基于动态X射线荧光成像技术对高集光效率、单色化成像诊断设备的需求，提出了一种四通道球面弯晶成像系统设计。采用“圆锥体”空间排布方式，解决了多个通道耦合问题。通过调整弯晶姿态，实现了像点的合理分布。针对4.51 keV能点，采用Ge(400)球面弯晶作为成像元件，给出了四通道弯晶成像系统的光学初始结构参数。在实验中利用Ti靶X射线光管，对单个通道进行了网格背光成像，获得的二维图像放大倍数为7.8倍，空间分辨率达到15 μm，初步验证了系统的成像性能。四通道弯晶成像系统与分幅相机结合，能有效解决动态X射线荧光成像技术信号弱、图像信噪比低的技术难点。
- 球面弯晶 /
- 动态X射线荧光成像 /
- 单色成像 /
- 空间分辨率
Abstract:
Since dynamic X-ray fluorescence imaging technology requires diagnostic equipment which has high throughput and narrow spectral width, we present the design of four-channel spherically bent crystal imaging system. The system adopts a cone spatial configuration to solve the problem of multiple channel coupling. With the size limit of framing camera taken into account, the images are reasonably planned by adjusting the position of bent crystal. We utilize Ge 400 crystal as the imaging component at 4.51 keV and then propose optical initial structural parameters of system. Grid backlit images of single channel are obtained by using X-ray tube in the laboratory. The magnification is 7.8, and the spatial resolution is 15 μm. The results preliminarily verify the performance of system. The four-channel system combined with the framing camera can effectively solve the technical difficulties such as weak signal and low signal to noise ratio in dynamic fluorescence imaging.
- spherically bent crystal /
- dynamic X-ray fluorescence imaging /
- monochromatic imaging /
- spatial resolution

HTML全文

图 1 球面弯晶成像原理

Figure 1. Principle of spherically bent crystal imaging

下载: 全尺寸图片幻灯片

图 2 四通道球面弯晶成像系统示意图

Figure 2. Schematic diagram of four-channel spherically bent crystal imaging system

下载: 全尺寸图片幻灯片

图 3 Ge(400)晶体XRD测试结果

Figure 3. XRD test result of Ge(400)

下载: 全尺寸图片幻灯片

图 4 背光成像系统和自发光成像系统的区别

Figure 4. Comparison between the backlighter system and self-emission imager

下载: 全尺寸图片幻灯片

图 5 单个通道的成像结果

Figure 5. Imaging result of single channel

下载: 全尺寸图片幻灯片

表 1 四通道球面弯晶成像系统参数

Table 1. Parameters of four-channel spherically bent crystal imaging system

E/ keV	crystal	2d/nm	θ/(°)	L/mm	β/(°)	R/mm	p/mm	q_m/mm
4.51	Ge(400)	0.282 8	76.4	10	30	250	141	878
q_s/mm	q/mm	M	Δd/mm	α₁/(°)	α₂/(°)	α₃/(°)	α₄/(°)
1463	1102	7.8	10	-0.29	0.29	-0.87	0.87

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