發(fā)布時間：2019-05-06 17:04

【摘要】：近年來隨著現(xiàn)代醫(yī)學(xué)水平的不斷提升,對人體內(nèi)部溫度的精確測量和實時監(jiān)控有著越來越廣泛的應(yīng)用需求。例如對新生兒大腦溫度的監(jiān)控、通過測量人體組織的溫度來診斷腫瘤等。傳統(tǒng)的接觸式測溫法往往需要通過手術(shù)植入感溫元件,不僅改變了目標組織原有的溫度分布,而且具有一定的破壞性。而在非接觸式測量方法中,采用微波輻射測量技術(shù)可以無損傷、實時地獲取人體內(nèi)部組織的溫度,因此,微波無損測溫在人體醫(yī)學(xué)測溫領(lǐng)域有著廣闊的發(fā)展前景和研究意義。在此研究背景下,本文對微波輻射測量人體內(nèi)部溫度的反演方法進行了研究。本文首先對微波無損測量人體內(nèi)部溫度的原理進行了敘述,然后在對已有人體組織微波輻射傳輸模型研究的基礎(chǔ)上,建立了人體組織的五層微波輻射傳輸模型,并分別利用相干法和非相干法對構(gòu)建的模型進行了仿真,最后將兩者的結(jié)果進行了對比分析,驗證了微波輻射傳輸模型的正確性。與已有模型相比,該輻射傳輸模型考慮了層間的多次反射,并能計算不同發(fā)射角情況下的亮溫。接著,本文在調(diào)研各種人體溫度反演方法的基礎(chǔ)上,選取了多角度法對人體內(nèi)部溫度反演進行了仿真,仿真得到的人體內(nèi)部溫度分布與理論值較為吻合,驗證了反演算法的正確性。最后,本文采用C波段輻射計測量了溫度隨深度呈線性分布水的微波輻射亮溫,并利用多角度法從水的亮溫反演出不同深度的水溫,驗證了利用微波輻射計無損測量溫度的有效性。
[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.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：R443.5

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