We previously proposed the frequency and plane-wave compounding minimum variance distortion-free response (FPWC-MVDR) beamformer for ultrasonic reception beamforming, which weights the transmission angle and frequency band adaptively. This method required multiple subband transmissions and receptions for each transmission angle, reducing the frame rate. Here, we propose a filtered-FPWC-MVDR method that extracts and uses subband components via signal processing from the echo received after a single wideband pulse transmission. After confirming that this method provides the same performance as the original FPWC-MVDR, we experimentally investigate the subband conditions required, i.e. the bandwidth and number of subbands, when using this method. As a result, to improve the point target resolution, we find that there is an appropriate subbandwidth condition involving a trade-off between ensuring echo localization and increasing the degrees of freedom for frequency weight determination. Additionally, for improved contrast, the subbands were arranged appropriately to cover the entire usable frequency band.

我们之前提出了用于超声接收波束形成的频率和平面波复合最小方差无失真响应（FPWC-MVDR）波束形成器，它自适应地对传输角度和频带进行加权。这种方法需要针对每个传输角度进行多个子带传输和接收，从而降低了帧速率。在这里，我们提出了一种滤波 FPWC-MVDR 方法，该方法通过信号处理从单个宽带脉冲传输后接收到的回波中提取和使用子带分量。在确认该方法提供与原始 FPWC-MVDR 相同的性能后，我们通过实验研究了使用该方法时所需的子带条件，即子带的带宽和数量。因此，为了提高点目标分辨率，我们发现有一个适当的子带宽条件，涉及在确保回声定位和增加频率权重确定的自由度之间进行权衡。此外，为了提高对比度，适当地安排了子带以覆盖整个可用频带。