IEEE Trans Ultrason Ferroelectr Freq Control. 2011 Apr;58(4):680-4. doi: 10.1109/TUFFC.2011.1859.
To overcome the inherent low frame rate of conventional ultrasound, we have previously presented a system that can be implemented on conventional ultrasound scanners for high-frame-rate imaging of monochromatic tissue motion. The system employs a sector subdivision technique in the sequencer to increase the acquisition rate. To eliminate the delays introduced during data acquisition, a motion phase correction algorithm has also been introduced to create in-phase displacement images. Previous experimental results from tissue- mimicking phantoms showed that the system can achieve effective frame rates of up to a few kilohertz on conventional ultrasound systems. In this short communication, we present a new pulse sequencing strategy that facilitates high-frame-rate imaging of monochromatic motion such that the acquired echo signals are inherently in-phase. The sequencer uses the knowledge of the excitation frequency to synchronize the acquisition of the entire imaging plane to that of an external exciter. This sequencing approach eliminates any need for synchronization or phase correction and has applications in tissue elastography, which we demonstrate with tissue-mimicking phantoms.
为了克服传统超声固有的低帧率限制，我们之前提出了一种可在常规超声扫描仪上实现的系统，用于对单频组织运动进行高帧率成像。该系统在序列器中采用扇形细分技术来提高采集速度。为了消除数据采集过程中引入的延迟，还引入了运动相位校正算法来创建同相位移图像。之前来自组织模拟体模的实验结果表明，该系统可在常规超声系统上实现高达几千赫兹的有效帧率。在本简讯中，我们提出了一种新的脉冲序列策略，可实现单频运动的高帧率成像，从而使采集的回波信号本质上是同相的。序列器利用激励频率的知识将整个成像平面的采集与外部激励器同步。这种测序方法消除了对同步或相位校正的任何需求，并在组织弹性成像中具有应用，我们使用组织模拟体模对此进行了演示。
