X射线相衬成像中高辐射通量面阵结构阳极X射线源的研究

Grating-based X-ray differential phase contrast imaging can simultaneously get absorption, phase contrast and scattering of multi-contrast image for the matter consisted of the light elements, which has important potential applications in the field of materials science, medicine, biology in the future. However, due to the limitation of absorption grating devices in the system, it can not be used for large field of view and high-energy X-ray applications, which greatly limits the application capabilities. Using multi-line X-ray source for a normal X-ray source and the source grating for differential phase contrast imaging technique developed in recent years, and it could overcome the problem of high-energy X-ray limit. Even though, since the line anode emitter of the multi-line X-ray source axial extended distribution, the field of view of phase contrast and scattering images were limited. This application proposed and developed a new structure with high radiation flux X-ray source, it not only could overcome the limited of field of view resulted by multi-line X-ray source but also be unlimited by high-energy X-rays, the project successful implementation will allow to X-ray differential phase contrast imaging device achieve in the common laboratory with a more general real possibility.

X射线光栅微分相衬成像可以同时得到由轻元素构成物质的吸收、相衬和散射的多衬度图像，在未来的材料科学、医学、生物学等研究领域具有重要的应用潜力。但由于系统中吸收光栅器件的限制，使其不能用于大视场和高能X射线场合，大大限制了应用能力。使用阵列结构阳极X射线源代替普通X射线源和源光栅用于微分相衬成像是近年来刚刚发展的技术，它能克服高能X射线限制的问题。但由于阵列结构阳极线发射体的轴向扩展分布，导致相衬和散射成像视场受限。本申请方案提出并研制一种高辐射通量新型结构X射线源，它即可以克服阵列结构阳极X射线源导致成像视场受限的缺点，又不受高能X射线的限制，该项目的成功实施将使得X射线微分相衬成像装置在普通实验室的实现更具有现实可能性。

X射线吸收成像已经广泛应用于各个领域，但对由轻元素构成的物质（例如硅基半导体器件和人体的软组织），仍然无法获得较高衬度的图像。X射线光栅微分相衬成像是近年来X射线成像领域的研究热点之一，它可以在常规X射线源上对由轻元素构成的物质获得较高衬度的图像，从而弥补传统吸收成像的不足。使用阵列结构阳极X射线源是近年来刚刚发展的技术，它能克服高能X射线限制的问题。但由于阵列结构阳极线发射体的轴向扩展分布，导致相衬成像视场受限。本申请方案提出并研制一种高辐射通量新型结构X射线源，它即可以克服由阵列结构阳极X射线源所导致成像视场受限的缺点，又不受高能X射线的限制，本课题的研究将使得X射线微分相衬成像技术在医疗诊断和工业无损检测的应用具有重要的现实意义。