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超声波CT作为一种热测量方法 ,具有不接触、对温度场不干扰的优点。本文发展一种新的超声波CT再现方法 ,用于解决受限透视角度所产生的信息量不足的问题。新的超声波CT再现算法建立在逆矩阵变换的基础上 ,它不同于通常的采用SL过滤器的所谓FBPCT再现方式。论文中描述了三种CT迭代再现算法 ,用计算机模拟结果和三维温度场测量实验数据验证了再现算法的可靠性。同时根据计算和实验结果 ,建议在受限的透视角度情况下 ,迭代方法采用修正的正则最小二乘法CGM是合适的
Ultrasound CT as a thermal measurement method, with no contact, the temperature field does not interfere with the advantages. In this paper, a new method of ultrasonic CT reconstruction is developed, which is used to solve the problem of insufficient information generated by limited perspective. The new ultrasound CT reconstruction algorithm builds on the inverse matrix transformation, which is different from the usual so-called FBPCT reproduction with SL filters. Three CT iterative reconstruction algorithms are described in the paper. The reliability of the reconstruction algorithm is verified by computer simulation and three-dimensional temperature field measurement. At the same time, based on the calculation and experimental results, it is suggested that the modified regular least squares CGM is suitable for the iterative method under limited perspective