Noninvasive Measurement of 3D Thermal Distribution by Using the Ultrasonic Inverse Scattering Quantitative CT Technique

利用超声逆散射定量CT技术无创测量3D热分布

• 批准号: 09650458
• 负责人: YAMADA Akira
• 金额: $ 1.34万
• 依托单位: Tokyo University of Agriculture and Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650458/
• 关键词: Ultrasonic Computed Tomography; Noninvasive Thermometer; Acoustic Inverse Scattering Analysis; Tree-Dimensional Image; Quantitative CT; Weak Scattering Approximation; Diffraction Tomography; Thermography

In this study, the inverse scattering quantitative CT technique was investigated aiming at the realization of the remote sensing noninvasive CT temperature measurement technique. The present technique utilizes the acoustic character of the temperature dependencies of the medium with the variation of the sound speed. That is, the temperature distribution of the objet was obtained from the reconstruction of the sound speed variation of the object from the known constant temperature state. The quasi 31) CT technique using the observation data around the perpendicular axis of the object, and the weak scattering linearization approximation method by the backward propagation Rytov transform were examined to meet the practical requirement encountered in the realization of the inverse scattering quantitative CT technique. As a result of the test examination, the dependencies between the measurement error of the received complex sound pressure amplitude assumed in the practical situation and the precision of the temperature image in the water medium was demonstrated using the simulation data. For the case when the resolution of the image was set with 5mm and the signal to noise ratio of the received signal was over 30 dB, the precision of the reconstructed temperature image was proved to be under 0.1 degree over the 10 degree temperature range. As a result, high speed and high precision noninvasive measurement technique of the 3D temperature distribution of the medium was developed, which promises well to the applications in the medical diagnosis or the industrial plant control.

本文以实现遥感无损CT测温技术为目标，对逆散射定量CT技术进行了研究。本技术利用了介质的温度依赖性随声速变化的声学特性。也就是说，对象的温度分布是从已知的恒定温度状态重建对象的声速变化而获得的。针对逆散射定量CT技术实现中的实际需要，研究了利用物体垂直轴周围观测数据的准CT技术和利用反向传播Rytov变换的弱散射线性化近似方法。作为试验检查的结果，使用模拟数据证明了在实际情况下假设的接收复声压振幅的测量误差与水介质中的温度图像的精度之间的依赖性。对于图像分辨率设置为5mm、接收信号信噪比大于30dB的情况，在10度温度范围内，重建温度图像的精度低于0.1度。从而发展了一种高速、高精度的介质三维温度分布无损测量技术，在医疗诊断和工业控制中有着良好的应用前景。

项目成果

M.Kuroiwa and A.Yamada: "Ultrasonic attenuation image of the biological tissues by using the diffraction tomographic technique" Jpn.J.Appl.Phys.37・5B(accepted for publication). (1998)

M.Kuroiwa 和​​ A.Yamada：“使用衍射断层扫描技术的生物组织的超声衰减图像”Jpn.J.Appl.Phys.37・5B（接受出版）（1998）。

A.Yamada and M.Kuroiwa: "Quantitative ultrasonic attenuation image of the biological tissues using the inverse scattering technique" Proc.of IEEE Ultrasonics Symp.(to be published). (1998)

A.Yamada 和 M.Kuroiwa：“使用逆散射技术对生物组织进行定量超声衰减图像”Proc.of IEEE Ultrasonics Symp.（待出版）。

A.Yamada and M.Kuroiwa: "Quantitative ultrasonic attenuation image of the biological tissues using the inverse scattering technique" Proc.of IEEE Ultrasonics Symp., Sendai. (to be published). (1998)

A.Yamada 和 M.Kuroiwa：“使用逆散射技术对生物组织进行定量超声衰减图像”Proc.of IEEE Ultrasonics Symp.，仙台。

M.Kuroiwa and A.Yamada: "Ultrasonic attenuation image of the biological tissues by using the diffraction tomographic technique" Jpn.J.Appl.Phys.37・5B. 3088-3092 (1998)

M.Kuroiwa 和​​ A.Yamada：“使用衍射断层扫描技术的生物组织的超声衰减图像”Jpn.J.Appl.Phys.37・5B 3088-3092 (1998)。

M.Kuroiwa and A.Yamada: "Ultrasonic attenuation image of the biological tissues by using the diffraction tomographic technique" Jpn.J.Appl.Phys.37. 3088-3092 (1998)

M.Kuroiwa 和​​ A.Yamada：“利用衍射断层扫描技术获得生物组织的超声衰减图像”Jpn.J.Appl.Phys.37。