太赫兹辐射具有低光子能量和较高的透射性, 并对水分子等极性物质反应敏感, 因此太赫兹数字全息成像法可以快速准确地获取生物组织信息。本文利用太赫兹数字全息成像系统对猪肉和羊肉组织切片进行测量, 采用菲涅耳反衍射方法对实验结果进行优化, 选取0.9 THz分量的振幅图像进行分析。通过计算组织的吸光度获取0.9 THz吸光度图像。实验结果显示, 肌肉组织的吸光度均在8 cm-1以上, 脂肪组织的吸光度不超过4 cm-1。采用主成分分析方法获得吸光度得分图并进行重建, 从重建结果中可以清晰区分生物组织的不同区域。由此表明, 太赫兹数字全息成像技术能够直接获取生物组织的二维信息, 探测时间短、效率高, 在生物检测领域具有广阔的应用前景。

Terahertz (THz) radiation has low photon energy and high transmissivity and is sensitive to polar materials such as hydrone. Thus, THz digital holographic imaging method has the capacity to acquire biological tissue information rapidly and correctly. Herein, tissue slices of pork and mutton were measured with THz digital holographic imaging system. The experimental images were optimized with method of Fresnel diffraction and the amplitude image of 0.9 THz component was selected for analysis. 0.9 THz absorbance image was acquired by calculating tissular absorbance. The results show that all the absorbance of muscle tissue is above 8 cm-1 while that of adipose tissue is less than 4 cm-1. Absorbance score plot is retrieved with Principle Component Analysis(PCA) and the different regions in biological tissue can be distinguished clearly from the results of reestablishment, which show that THz digital holographic imaging technology is able to acquire two-dimensional information of biological tissue with the advantages of short detection time and high efficiency. Thus, it has broad application prospects in the field of biological detection.