Image Quality Improvement of Ultrasonic Computed Tomography on the Basis of Maximum Likelihood Expectation Maximization Algorithm Considering Anisotropic Acoustic Property and Time-of-Flight Interpolation
Image Quality Improvement of Ultrasonic Computed Tomography on the Basis of Maximum Likelihood Expectation Maximization Algorithm Considering Anisotropic Acoustic Property and Time-of-Flight Interpolation
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DOI：
10.1143/jjap.49.07hc12
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发表时间：
2010-07
影响因子：
1.5
通讯作者：
H. Fan;H. Yanagida;Y. Tamura;Shuqiang Guo;T. Saitoh;Tatsuhisa Takahashi
中科院分区：
文献类型：
--
作者：
H. Fan;H. Yanagida;Y. Tamura;Shuqiang Guo;T. Saitoh;Tatsuhisa Takahashi
为了提高木柱超声计算机断层扫描的图像质量，考虑了木柱各向异性声学特性。基于最大似然期望最大化（ML-EM）方法，提出了一种用于图像重建的飞行时间（TOF）数据速度各向异性校正方法。我们还研究了TOF数据插值的影响，因为TOF数据的密度对ML-EM方法中的图像质量有相当大的影响。利用数值模型和木模型详细分析了速度各向异性校正和TOF数据插值的可行性。
The anisotropic acoustic property is considered for the purpose of improving the image quality of the ultrasonic computed tomography (CT) scans of a wooden pillar. We propose a velocity anisotropy correction method of time-of-flight (TOF) data for image reconstruction on the basis of the maximum likelihood-expectation maximization (ML-EM) method. We also examine the effect of the interpolation of the TOF data as the density of the TOF data has a considerable effect on image quality in the ML-EM method. The feasibility of velocity anisotropy correction and TOF data interpolation are examined in detail using numerical and wood phantoms.