A two‐dimensional array system for studies of ultrasonic imaging with aberration correction
A two‐dimensional array system for studies of ultrasonic imaging with aberration correction
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用于研究像差校正超声成像的二维阵列系统
DOI：
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发表时间：
1999
期刊：
影响因子：
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通讯作者：
M. Tabei
中科院分区：
文献类型：
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作者：
R. Waag;D. Phillips;J. Lacefield;C. Draeger;F. Lin;M. Tabei
描述了用于像差校正的脉冲回波研究的二维阵列系统。换能器阵列为80×80阵列，中心频率为3.0 MHz，−6‐dB带宽为56%。在中心频率处，每个元件具有1.04波长的物理尺寸和1.2波长的间隔。多路复用器访问任何连续的128个元素用于发送，并且访问任何连续的16个元素用于同时接收。发射电子设备具有独立可编程波形。每个接收通道都包括一个20 MHz、12位A/D转换器和一个可编程超过40 dB的时变增益。合成形成高达阵列大小的发射和接收孔径。已经实现了一种迭代地预失真发射波形以产生补偿像差的发射聚焦的方法。测量了通过水路径和组织模拟像差路径传播的点扩散函数。通过水路径、通过组织模拟像差路径形成了脉冲回波图像.
A two‐dimensional array system is described for pulse‐echo studies of aberration correction. The transducer array is an 80×80 array with a center frequency of 3.0 MHz and a −6‐dB bandwidth of 56%. At the center frequency, each element has a physical size of 1.04 wavelength and spacing of 1.2 wavelength. A multiplexer accesses any contiguous 128 elements for transmission and any contiguous 16 elements for simultaneous reception. Transmit electronics have independently programmable waveforms. Each receive channel includes a 20‐MHz, 12‐bit A/D converter, and a time varied gain programmable over 40 dB. Transmit and receive apertures up to the size of the array are formed synthetically. A method that iteratively predistorts transmit waveforms to produce a transmit focus compensated for aberration has been implemented. Point‐spread functions have been measured for propagation through a water path and through a tissue‐mimicking aberration path. Pulse‐echo images have been formed through a water path, through a t...