微波无损测量人体内部温度的反演方法研究

发布时间：2019-05-06 17:04

【摘要】：近年来随着现代医学水平的不断提升,对人体内部温度的精确测量和实时监控有着越来越广泛的应用需求。例如对新生儿大脑温度的监控、通过测量人体组织的温度来诊断肿瘤等。传统的接触式测温法往往需要通过手术植入感温元件,不仅改变了目标组织原有的温度分布,而且具有一定的破坏性。而在非接触式测量方法中,采用微波辐射测量技术可以无损伤、实时地获取人体内部组织的温度,因此,微波无损测温在人体医学测温领域有着广阔的发展前景和研究意义。在此研究背景下,本文对微波辐射测量人体内部温度的反演方法进行了研究。本文首先对微波无损测量人体内部温度的原理进行了叙述,然后在对已有人体组织微波辐射传输模型研究的基础上,建立了人体组织的五层微波辐射传输模型,并分别利用相干法和非相干法对构建的模型进行了仿真,最后将两者的结果进行了对比分析,验证了微波辐射传输模型的正确性。与已有模型相比,该辐射传输模型考虑了层间的多次反射,并能计算不同发射角情况下的亮温。接着,本文在调研各种人体温度反演方法的基础上,选取了多角度法对人体内部温度反演进行了仿真,仿真得到的人体内部温度分布与理论值较为吻合,验证了反演算法的正确性。最后,本文采用C波段辐射计测量了温度随深度呈线性分布水的微波辐射亮温,并利用多角度法从水的亮温反演出不同深度的水温,验证了利用微波辐射计无损测量温度的有效性。
[Abstract]:In recent years, with the continuous improvement of modern medical level, the precise measurement and real-time monitoring of the internal temperature of human body are more and more widely used. For example, neonatal brain temperature monitoring, by measuring the temperature of human tissue to diagnose tumors, and so on. The traditional contact temperature measurement method often needs to be implanted by surgery, which not only changes the original temperature distribution of the target tissue, but also has a certain degree of destruction. In the non-contact measurement method, microwave radiation measurement technology can be used to obtain the temperature of human tissue in real-time without damage. Therefore, microwave nondestructive temperature measurement has a broad development prospect and research significance in the field of human medicine temperature measurement. In this paper, the inversion method of microwave radiation to measure the internal temperature of human body is studied in this paper. In this paper, the principle of microwave nondestructive measurement of the internal temperature of human body is described, and then on the basis of studying the existing microwave radiation transfer model of human tissue, a five-layer microwave radiation transfer model of human tissue is established. The model is simulated by using the coherence method and the non-coherent method respectively. Finally, the results of the two models are compared and analyzed, and the correctness of the microwave radiation transfer model is verified. Compared with the existing models, the radiative transfer model takes into account the multi-reflection between layers and can calculate the brightness temperature at different emission angles. Then, on the basis of investigating all kinds of human body temperature inversion methods, the multi-angle method is selected to simulate the human body internal temperature inversion, and the simulated internal temperature distribution is in good agreement with the theoretical value. The correctness of the inversion algorithm is verified. Finally, the microwave radiation brightness temperature of water with linear distribution with depth is measured by using C-band radiometer, and the water temperature of different depths is calculated from the brightness temperature of water by multi-angle method. The validity of nondestructive measurement of temperature by microwave radiometer is verified.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：R443.5

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