无吸收光栅的X射线相位衬度成像实验研究

摘要

According to the theoretical analysis of X-ray differential phase-contrast imaging system based on one-dimensional spatial- coherence X-ray source with multi-line structured anode, a scintillator functioning as an absorption grating, and a phase grating fab- ricated by photo-assisted electrochemical etching technique developed by us, we construct a non-absorption grating X-ray differential phase-contrast imaging system, conduct the experiments on some biological samples prepared with the above system, and finally obtain some phase-contrast images with more structural information than the ones obtained by conventional X-ray absorption method. Consequently, out system can be considered as a feasible imaging system and can have potential applications in hospitals and laboratories.%通过对基于空间相干源和具有分析光栅功能的x射线转换屏的微分干涉x射线相位衬度成像系统的理论分析，利用线发射体阵列结构阳极x射线管和光助电化学刻蚀技术研制的相位光栅和具有分析光栅功能的x射线转换屏，组建了一种无吸收光栅的x射线微分干涉相衬成像系统．在此系统上开展了生物样品的实验研究，获得了较传统吸收成像更为清晰和更多样品结构信息的相位衬度图像．从而试验验证了该系统方案设计的可行性，为x射线相衬成像技术从实验室走向临床应用提供了有效途径．