Realization and Quality Improvement of the Ultrasonic Diffraction Tomography for Medical Diagnosis

医学诊断超声衍射断层扫描的实现及质量改进

• 批准号: 04650363
• 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 General Scientific Research (C)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-04650363/
• 关键词: Ultrasonic Computed Tomography; Diffraction Tomography; Acoustic Imaging; Inverse Scattering; Ultrasonic Medical Diagnosis; Breast Cancer Screening

Aiming at the realization of the ultrasonic diffraction tomography, strategies for reducing the artifact of the image were presented as follows.1 Reduction of Errors in Input Data (1) High Resolution Measurement of the Complex Scattered Wave Amplitude by Using the Digital Synchronous Detection Method : Scattered signal amplitudes were measured by the combination of the selective sampling of the received rf burst signal and the digital synchronous detection calculation. This method has an advantage that the signal component by an ideal plane wave illumination can be extracted keeping high noise tolerant capability.2 Error Reduction in Reconstruction Procedure (1) Smoothing Filtering : Validity of the smoothing filter for the mitigation of noise amplification in the reconstruction calculations was demonstrated.3 Mitigation of the Scattering Model Error (1) Optimization of the Surrounding Medium Velocity : Contrary requirements for minimizing the errors caused by the weak scattering appro … More ximation and the measurement data noise were satisfied by adjusting the surrounding medium velocity at optimun value. (2) Using the Knowledge of the Background Velocity : For the relaxation of the weak scattering condition, the background informations were incorporated into the conventional first-order Born reconstruction based on the knowledge of the background velocity information. (3) Two-Dimensional Model Error : From the simulation calculation using the three-dimensional sphere object, it was shown that optimum object velocity exits which makes the model error to be minimum.4 Performance Examination Quantitative precision of the reconstructed velocity image was verified through the simulation and experiment examinations using the concentric cylinder tissue mimicking object. It was verified that images could be obtained with high fidelity witin the tolerances of practical situations. Hereafter, practical examinations for the breast cancer screening test, incorporation of the three-dimensional reconstructing scheme are necessary. Less

针对超声衍射断层成像的实现，提出了如下减少图像伪影的策略。 1 减少输入数据误差 (1) 采用数字同步检波方法高分辨率测量复杂散射波幅度：通过对接收的射频突发信号进行选择性采样和数字同步检波计算相结合来测量散射信号幅度。该方法的优点是可以提取理想平面波照明的信号分量，同时保持高噪声容忍能力。2 重建过程中的误差减少 (1) 平滑滤波：证明了平滑滤波器在重建计算中减轻噪声放大的有效性。3 散射模型误差的减轻 (1) 周围介质速度的优化：最小化弱介质引起的误差的相反要求 通过将周围介质速度调整到最佳值，满足散射近似和测量数据噪声。 (2)利用背景速度的知识：为了缓和弱散射条件，基于背景速度信息的知识将背景信息合并到传统的一阶Born重建中。 (3)二维模型误差：通过三维球体的模拟计算表明，存在最佳的物体速度，使得模型误差最小。4性能检验通过同心圆柱体组织模拟物体的仿真和实验检验，验证了重建速度图像的定量精度。经验证，在实际情况的公差范围内可以获得高保真度的图像。此后，需要对乳腺癌筛查测试进行实际检查，并结合三维重建方案。较少的

项目成果

A.Yamada and Kurahashi: "Experimental Image Quality Estimation of Ultrasonic Diffraction Tomography" Jpn.J.A.Phys.32. 2507-2509 (1993)

A.Yamada 和 Kurahashi：“超声衍射断层扫描的实验图像质量估计”Jpn.J.A.Phys.32。

Akira Yamada: "Quality Improvement of Ultrasonic Diffraction Tomography Based on Knowledge of Background Velocity" Jpn.J.A.Phys.(to be published). (1994)

Akira Yamada：“基于背景速度知识的超声衍射断层扫描质量改进”Jpn.J.A.Phys.（待出版）。

A.Ymada and K.Kurahashi: ""Experimental Image Quality Estimation of Ultrasonic Diffraction Tomography"" Jpn.J.A.Phys.vol.32. 2507-2509 (1993)

A.Ymada 和 K.Kurahashi：“超声衍射断层扫描的实验图像质量估计”Jpn.J.A.Phys.vol.32。

山田晃,倉橋一夫: "超音波回折トモグラフィーの画像誤差軽減法の検討" 電子情報通信学会論文誌. J76-A. 1270-1278 (1993)

Akira Yamada、Kazuo Kurahashi：“超声衍射断层扫描图像误差减少方法的研究”电子、信息和通信工程师学会学报 J76-A 1270-1278（1993）。

A.Ymada and K.Kurahashi: ""Error Reduction in Ultrasonic Diffraction Tomography"" IEICE Jpn.J76-A. 1270-1278 (1993)

A.Ymada 和 K.Kurahashi：“超声衍射断层扫描中的误差减少””IEICE Jpn.J76-A。