连续波THz-CT的折射问题研究

发布时间：2018-03-17 22:11

本文选题：计算机断层成像　切入点：太赫兹　出处：《红外与激光工程》2015年03期 　论文类型：期刊论文

【摘要】：设计了基于返波振荡器的连续波太赫兹CT成像实验装置,实现了用连续太赫兹波对三维物体的CT断层成像。虽然可以得到较好的重建图像,但由于折射率大于1.5的材料对太赫兹射线折射较强而影响成像质量。首先通过对聚四氟乙烯模型进行扫描获得投影数据,并利用滤波反投影算法对投影数据进行重建得到断层图像,然后分析了高折射对投影探测及图像重建的影响。最后对人体牙齿样本进行投影扫描和断层重建,获得的断面图像可以反映牙齿内部结构,但由于牙齿高折射率的影响,成像精度和分辨率有待进一步提高。而且牙釉质的厚度会严重影响太赫兹波在牙齿中的透射深度。研究结果可以为提高连续波太赫兹CT成像质量提供参考,促进其在医学成像特别是牙齿等骨骼成像中的应用。
[Abstract]:A continuous wave terahertz CT imaging experimental device based on backwave oscillator is designed, and the CT tomography of 3D object with continuous terahertz wave is realized. However, the imaging quality is affected by the strong refraction of materials with refractive index greater than 1.5 to terahertz rays. First, the projection data are obtained by scanning the PTFE model. Then, the influence of high refraction on projection detection and image reconstruction is analyzed. Finally, projection scanning and tomography reconstruction of human tooth samples are carried out. The sectional images obtained can reflect the internal structure of the teeth, but due to the high refractive index of the teeth, The imaging accuracy and resolution need to be further improved, and the thickness of tooth enamel will seriously affect the transmission depth of terahertz wave in teeth. The results can provide a reference for improving the quality of THz CT imaging. To promote its application in medical imaging, especially in bone imaging such as teeth.
【作者单位】：中国计量学院信息工程学院太赫兹技术与应用研究所;南京军区杭州疗养院海勤疗养区;
【基金】：南京军区医药卫生科研项目(12MA115) 国家质检总局科技计划(2013QK030) 浙江省公益技术应用研究(2013C31088)
【分类号】：R814.4

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