Correction of ultrasonic wave aberration with a time delay and amplitude filter.
Correction of ultrasonic wave aberration with a time delay and amplitude filter.
复制标题
使用时间延迟和幅度滤波器校正超声波像差。
DOI：
10.1121/1.1559174
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
B. Angelsen
中科院分区：
文献类型：
--
作者：
S. Måsøy;T. Johansen;B. Angelsen
通过两个不同的异构人体壁模型进行传播的二维模拟已经被执行，以分析由于前向波传播引起的超声波像差的不同校正滤波器。不同模型各自产生大部分特征像差效应，例如相位像差、相对较强的幅度像差和波形变形。对从 20 mm 换能器焦点 (60 mm) 中的点源穿过体壁模型的波传播进行了模拟。脉冲的中心频率为2.5 MHz。参考用最佳滤波器获得的校正来评估由两个体壁模型引入的像差的校正：广义频率相关相位和幅度校正滤波器[Angelsen，超声波成像（Emantec，挪威，2000），卷。二]。应用了两个校正滤波器：时间延迟滤波器以及时间延迟和幅度滤波器。结果表明，在两种情况下，使用延时滤波器进行校正都可以显着减少像差。时间延迟和幅度校正滤波器在这两种情况下都表现得更好，并且给出的校正接近理想情况（无像差）。结果还表明，校正效果对到达时间波动估计（即时延校正滤波器）的精度非常敏感。
Two-dimensional simulations with propagation through two different heterogeneous human body wall models have been performed to analyze different correction filters for ultrasonic wave aberration due to forward wave propagation. The different models each produce most of the characteristic aberration effects such as phase aberration, relatively strong amplitude aberration, and waveform deformation. Simulations of wave propagation from a point source in the focus (60 mm) of a 20 mm transducer through the body wall models were performed. Center frequency of the pulse was 2.5 MHz. Corrections of the aberrations introduced by the two body wall models were evaluated with reference to the corrections obtained with the optimal filter: a generalized frequency-dependent phase and amplitude correction filter [Angelsen, Ultrasonic Imaging (Emantec, Norway, 2000), Vol. II]. Two correction filters were applied, a time delay filter, and a time delay and amplitude filter. Results showed that correction with a time delay filter produced substantial reduction of the aberration in both cases. A time delay and amplitude correction filter performed even better in both cases, and gave correction close to the ideal situation (no aberration). The results also indicated that the effect of the correction was very sensitive to the accuracy of the arrival time fluctuations estimate, i.e., the time delay correction filter.
登录
查看更多内容
影响因子：
2.4
作者：
Hinkelman, LM;Mast, TD;Waag, RC
通讯作者：
Waag, RC
影响因子：
2.4
作者：
Mast, TD;Hinkelman, LM;Waag, RC
通讯作者：
Waag, RC
影响因子：
2.4
作者：
HINKELMAN, LM;LIU, DL;WAAG, RC
通讯作者：
WAAG, RC
影响因子：
2.4
作者：
LIU, DL;WAAG, RC
通讯作者：
WAAG, RC
使用到达时间的最小均方误差估计对超声脉冲焦点退化进行时移补偿。
DOI：
10.1121/1.408348
发表时间：
1994
期刊：
The Journal of the Acoustical Society of America
影响因子：
--
作者：
Liu,DL;Waag,RC
通讯作者：
Waag,RC