Lacefield J C, von Ramm O T
Department of Electrical & Computer Engineering, University of Rochester, Rochester, NY 14627, USA. 1acefielQece.rochester.edu
IEEE Trans Ultrason Ferroelectr Freq Control. 2000;47(1):222-32. doi: 10.1109/58.818765.
A novel ultrasound imaging system has been implemented using two 32-element linear phased array transducers oriented at an angle of 40 degrees to one another. The system simultaneously acquires and displays, in real time, a conventional backscatter image and an angular scatter image formed using side-scattered echoes from the same region. The design of the system is shaped by the influence of the scatter angle on the spatial resolution and receive signal processing requirements of the instrument. The subtended scatter angles are restricted to values >90 degrees to ensure that the angular scatter receiver effectively tracks the transmitted pulse and that the spatial resolution in the two images is comparable. The system is sufficiently tolerant of small variations in the average acoustic velocity of the medium to guarantee reliable pulse tracking in biomedical applications. The angular scatter signal magnitude is significantly weighted by the directivity of the receive array. The imaging system will most effectively demonstrate angular variations in scattering at scatter angles between 125 and 145 degrees , where the angular response of the receiver is near its peak.
一种新型超声成像系统已被实现，它使用了两个相互成40度角的32阵元线性相控阵换能器。该系统实时同时采集并显示一幅传统背向散射图像和一幅利用来自同一区域的侧向散射回波形成的角向散射图像。系统的设计受到散射角对仪器空间分辨率和接收信号处理要求的影响。所张的散射角被限制在大于90度的值，以确保角向散射接收器能有效跟踪发射脉冲，并且两幅图像中的空间分辨率具有可比性。该系统对介质平均声速的小变化具有足够的耐受性，以保证在生物医学应用中可靠的脉冲跟踪。角向散射信号幅度受到接收阵列方向性的显著加权。该成像系统将最有效地展示在125至145度之间散射角处散射的角度变化，在此处接收器的角向响应接近其峰值。
