估计员
正交(天文学)
声学
基带
传感器
成像体模
扫描仪
运动估计
物理
计算机科学
数学
算法
光学
带宽(计算)
电信
统计
出处
期刊:IEEE Transactions on Ultrasonics Ferroelectrics and Frequency Control
[Institute of Electrical and Electronics Engineers]
日期:1998-05-01
卷期号:45 (3): 852-861
被引量:170
摘要
Conventional ultrasonic motion or flow velocity estimation is limited to the axial velocity component. A novel technique, called "spatial quadrature," for the simultaneous estimation of axial and lateral velocity components is introduced. This technique utilizes even and odd spatial weightings of the point spread function that have a quandrature relationship. These weightings produce modulation in the received echo that can be decoded to quantify lateral motion. This estimator can be implemented for two-dimensional velocity estimation with a conventional transducer array and medical ultrasound scanner, preferably one with parallel receive processing. The technique also can be extended to three-dimensional velocity estimation given an appropriate 2-D transducer and scanner architecture. Discussed are space and frequency domain descriptions of this estimator in the context of a brief overview of 2-D flow estimation methods, including analyses characterizing the performance envelope of this estimator. In addition, the application of this technique in CW and PW regimes, and with both radio frequency and baseband quadrature (I- and-Q) data, are discussed. Phantom studies demonstrate spatial quadrature in 2-D using a clinical scanner.
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